diff --git a/CHANGES.txt b/CHANGES.txt
index 306f46f23c..677ea114d1 100644
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@ -25,6 +25,7 @@ Merged from 2.2:
    header is received (CASSANDRA-11464)
  * Validate that num_tokens and initial_token are consistent with one another (CASSANDRA-10120)
 Merged from 2.2:
+ * Fix commit log replay after out-of-order flush completion (CASSANDRA-9669)
  * cqlsh: correctly handle non-ascii chars in error messages (CASSANDRA-11626)
  * Exit JVM if JMX server fails to startup (CASSANDRA-11540)
  * Produce a heap dump when exiting on OOM (CASSANDRA-9861)
diff --git a/src/java/org/apache/cassandra/db/ColumnFamilyStore.java b/src/java/org/apache/cassandra/db/ColumnFamilyStore.java
index 5b8de8ff15..e9a2938eb0 100644
--- a/src/java/org/apache/cassandra/db/ColumnFamilyStore.java
+++ b/src/java/org/apache/cassandra/db/ColumnFamilyStore.java
@@ -173,6 +173,9 @@ public class ColumnFamilyStore implements ColumnFamilyStoreMBean
         }
     }
 
+    @VisibleForTesting
+    public static volatile ColumnFamilyStore discardFlushResults;
+
     public final Keyspace keyspace;
     public final String name;
     public final CFMetaData metadata;
@@ -777,14 +780,14 @@ public class ColumnFamilyStore implements ColumnFamilyStoreMBean
      *
      * @param memtable
      */
-    public Future<?> switchMemtableIfCurrent(Memtable memtable)
+    public ListenableFuture<ReplayPosition> switchMemtableIfCurrent(Memtable memtable)
     {
         synchronized (data)
         {
             if (data.getView().getCurrentMemtable() == memtable)
                 return switchMemtable();
         }
-        return Futures.immediateFuture(null);
+        return waitForFlushes();
     }
 
     /*
@@ -794,14 +797,14 @@ public class ColumnFamilyStore implements ColumnFamilyStoreMBean
      * not complete until the Memtable (and all prior Memtables) have been successfully flushed, and the CL
      * marked clean up to the position owned by the Memtable.
      */
-    public ListenableFuture<?> switchMemtable()
+    public ListenableFuture<ReplayPosition> switchMemtable()
     {
         synchronized (data)
         {
             logFlush();
             Flush flush = new Flush(false);
             flushExecutor.execute(flush);
-            ListenableFutureTask<?> task = ListenableFutureTask.create(flush.postFlush, null);
+            ListenableFutureTask<ReplayPosition> task = ListenableFutureTask.create(flush.postFlush);
             postFlushExecutor.submit(task);
             return task;
         }
@@ -833,77 +836,93 @@ public class ColumnFamilyStore implements ColumnFamilyStoreMBean
     }
 
 
-    public ListenableFuture<?> forceFlush()
+    /**
+     * Flush if there is unflushed data in the memtables
+     *
+     * @return a Future yielding the commit log position that can be guaranteed to have been successfully written
+     *         to sstables for this table once the future completes
+     */
+    public ListenableFuture<ReplayPosition> forceFlush()
     {
-        return forceFlush(null);
+        Memtable current = data.getView().getCurrentMemtable();
+        for (ColumnFamilyStore cfs : concatWithIndexes())
+            if (!cfs.data.getView().getCurrentMemtable().isClean())
+                return switchMemtableIfCurrent(current);
+        return waitForFlushes();
     }
 
     /**
      * Flush if there is unflushed data that was written to the CommitLog before @param flushIfDirtyBefore
-     * (inclusive).  If @param flushIfDirtyBefore is null, flush if there is any unflushed data.
+     * (inclusive).
      *
-     * @return a Future such that when the future completes, all data inserted before forceFlush was called,
-     * will be flushed.
+     * @return a Future yielding the commit log position that can be guaranteed to have been successfully written
+     *         to sstables for this table once the future completes
      */
-    public ListenableFuture<?> forceFlush(ReplayPosition flushIfDirtyBefore)
+    public ListenableFuture<ReplayPosition> forceFlush(ReplayPosition flushIfDirtyBefore)
     {
-        // we synchronize on the data tracker to ensure we don't race against other calls to switchMemtable(),
-        // unnecessarily queueing memtables that are about to be made clean
-        synchronized (data)
-        {
-            // during index build, 2ary index memtables can be dirty even if parent is not.  if so,
-            // we want to flush the 2ary index ones too.
-            boolean clean = true;
-            for (ColumnFamilyStore cfs : concatWithIndexes())
-                clean &= cfs.data.getView().getCurrentMemtable().isCleanAfter(flushIfDirtyBefore);
-
-            if (clean)
-            {
-                // We could have a memtable for this column family that is being
-                // flushed. Make sure the future returned wait for that so callers can
-                // assume that any data inserted prior to the call are fully flushed
-                // when the future returns (see #5241).
-                ListenableFutureTask<?> task = ListenableFutureTask.create(new Runnable()
-                {
-                    public void run()
-                    {
-                        logger.trace("forceFlush requested but everything is clean in {}", name);
-                    }
-                }, null);
-                postFlushExecutor.execute(task);
-                return task;
-            }
-
-            return switchMemtable();
-        }
+        // we don't loop through the remaining memtables since here we only care about commit log dirtiness
+        // and this does not vary between a table and its table-backed indexes
+        Memtable current = data.getView().getCurrentMemtable();
+        if (current.mayContainDataBefore(flushIfDirtyBefore))
+            return switchMemtableIfCurrent(current);
+        return waitForFlushes();
     }
 
-    public void forceBlockingFlush()
+    /**
+     * @return a Future yielding the commit log position that can be guaranteed to have been successfully written
+     *         to sstables for this table once the future completes
+     */
+    private ListenableFuture<ReplayPosition> waitForFlushes()
     {
-        FBUtilities.waitOnFuture(forceFlush());
+        // we grab the current memtable; once any preceding memtables have flushed, we know its
+        // commitLogLowerBound has been set (as this it is set with the upper bound of the preceding memtable)
+        final Memtable current = data.getView().getCurrentMemtable();
+        ListenableFutureTask<ReplayPosition> task = ListenableFutureTask.create(new Callable<ReplayPosition>()
+        {
+            public ReplayPosition call()
+            {
+                logger.debug("forceFlush requested but everything is clean in {}", name);
+                return current.getCommitLogLowerBound();
+            }
+        });
+        postFlushExecutor.execute(task);
+        return task;
+    }
+
+    public ReplayPosition forceBlockingFlush()
+    {
+        return FBUtilities.waitOnFuture(forceFlush());
     }
 
     /**
      * Both synchronises custom secondary indexes and provides ordering guarantees for futures on switchMemtable/flush
      * etc, which expect to be able to wait until the flush (and all prior flushes) requested have completed.
      */
-    private final class PostFlush implements Runnable
+    private final class PostFlush implements Callable<ReplayPosition>
     {
         final boolean flushSecondaryIndexes;
         final OpOrder.Barrier writeBarrier;
         final CountDownLatch latch = new CountDownLatch(1);
-        final ReplayPosition lastReplayPosition;
         volatile FSWriteError flushFailure = null;
+        final ReplayPosition commitLogUpperBound;
+        final List<Memtable> memtables;
+        final List<Collection<SSTableReader>> readers;
 
-        private PostFlush(boolean flushSecondaryIndexes, OpOrder.Barrier writeBarrier, ReplayPosition lastReplayPosition)
+        private PostFlush(boolean flushSecondaryIndexes, OpOrder.Barrier writeBarrier, ReplayPosition commitLogUpperBound,
+                          List<Memtable> memtables, List<Collection<SSTableReader>> readers)
         {
             this.writeBarrier = writeBarrier;
             this.flushSecondaryIndexes = flushSecondaryIndexes;
-            this.lastReplayPosition = lastReplayPosition;
+            this.commitLogUpperBound = commitLogUpperBound;
+            this.memtables = memtables;
+            this.readers = readers;
         }
 
-        public void run()
+        public ReplayPosition call()
         {
+            if (discardFlushResults == ColumnFamilyStore.this)
+                return commitLogUpperBound;
+
             writeBarrier.await();
 
             /**
@@ -918,7 +937,7 @@ public class ColumnFamilyStore implements ColumnFamilyStoreMBean
 
             try
             {
-                // we wait on the latch for the lastReplayPosition to be set, and so that waiters
+                // we wait on the latch for the commitLogUpperBound to be set, and so that waiters
                 // on this task can rely on all prior flushes being complete
                 latch.await();
             }
@@ -927,18 +946,25 @@ public class ColumnFamilyStore implements ColumnFamilyStoreMBean
                 throw new IllegalStateException();
             }
 
-            // must check lastReplayPosition != null because Flush may find that all memtables are clean
-            // and so not set a lastReplayPosition
             // If a flush errored out but the error was ignored, make sure we don't discard the commit log.
-            if (lastReplayPosition != null && flushFailure == null)
+            if (flushFailure == null)
             {
-                CommitLog.instance.discardCompletedSegments(metadata.cfId, lastReplayPosition);
+                CommitLog.instance.discardCompletedSegments(metadata.cfId, commitLogUpperBound);
+                for (int i = 0 ; i < memtables.size() ; i++)
+                {
+                    Memtable memtable = memtables.get(i);
+                    Collection<SSTableReader> reader = readers.get(i);
+                    memtable.cfs.data.permitCompactionOfFlushed(reader);
+                    memtable.cfs.compactionStrategyManager.replaceFlushed(memtable, reader);
+                }
             }
 
             metric.pendingFlushes.dec();
 
             if (flushFailure != null)
                 throw flushFailure;
+
+            return commitLogUpperBound;
         }
     }
 
@@ -953,7 +979,8 @@ public class ColumnFamilyStore implements ColumnFamilyStoreMBean
     private final class Flush implements Runnable
     {
         final OpOrder.Barrier writeBarrier;
-        final List<Memtable> memtables;
+        final List<Memtable> memtables = new ArrayList<>();
+        final List<Collection<SSTableReader>> readers = new ArrayList<>();
         final PostFlush postFlush;
         final boolean truncate;
 
@@ -969,43 +996,33 @@ public class ColumnFamilyStore implements ColumnFamilyStoreMBean
              * that all write operations register themselves with, and assigning this barrier to the memtables,
              * after which we *.issue()* the barrier. This barrier is used to direct write operations started prior
              * to the barrier.issue() into the memtable we have switched out, and any started after to its replacement.
-             * In doing so it also tells the write operations to update the lastReplayPosition of the memtable, so
+             * In doing so it also tells the write operations to update the commitLogUpperBound of the memtable, so
              * that we know the CL position we are dirty to, which can be marked clean when we complete.
              */
             writeBarrier = keyspace.writeOrder.newBarrier();
-            memtables = new ArrayList<>();
 
             // submit flushes for the memtable for any indexed sub-cfses, and our own
-            AtomicReference<ReplayPosition> lastReplayPositionHolder = new AtomicReference<>();
+            AtomicReference<ReplayPosition> commitLogUpperBound = new AtomicReference<>();
             for (ColumnFamilyStore cfs : concatWithIndexes())
             {
                 // switch all memtables, regardless of their dirty status, setting the barrier
                 // so that we can reach a coordinated decision about cleanliness once they
                 // are no longer possible to be modified
-                Memtable mt = cfs.data.switchMemtable(truncate);
-                mt.setDiscarding(writeBarrier, lastReplayPositionHolder);
-                memtables.add(mt);
+                Memtable newMemtable = new Memtable(commitLogUpperBound, cfs);
+                Memtable oldMemtable = cfs.data.switchMemtable(truncate, newMemtable);
+                oldMemtable.setDiscarding(writeBarrier, commitLogUpperBound);
+                memtables.add(oldMemtable);
             }
 
-            // we now attempt to define the lastReplayPosition; we do this by grabbing the current limit from the CL
-            // and attempting to set the holder to this value. at the same time all writes to the memtables are
-            // also maintaining this value, so if somebody sneaks ahead of us somehow (should be rare) we simply retry,
-            // so that we know all operations prior to the position have not reached it yet
-            ReplayPosition lastReplayPosition;
-            while (true)
-            {
-                lastReplayPosition = new Memtable.LastReplayPosition(CommitLog.instance.getContext());
-                ReplayPosition currentLast = lastReplayPositionHolder.get();
-                if ((currentLast == null || currentLast.compareTo(lastReplayPosition) <= 0)
-                    && lastReplayPositionHolder.compareAndSet(currentLast, lastReplayPosition))
-                    break;
-            }
+            // we then ensure an atomic decision is made about the upper bound of the continuous range of commit log
+            // records owned by this memtable
+            setCommitLogUpperBound(commitLogUpperBound);
 
             // we then issue the barrier; this lets us wait for all operations started prior to the barrier to complete;
-            // since this happens after wiring up the lastReplayPosition, we also know all operations with earlier
+            // since this happens after wiring up the commitLogUpperBound, we also know all operations with earlier
             // replay positions have also completed, i.e. the memtables are done and ready to flush
             writeBarrier.issue();
-            postFlush = new PostFlush(!truncate, writeBarrier, lastReplayPosition);
+            postFlush = new PostFlush(!truncate, writeBarrier, commitLogUpperBound.get(), memtables, readers);
         }
 
         public void run()
@@ -1024,27 +1041,23 @@ public class ColumnFamilyStore implements ColumnFamilyStoreMBean
                 memtable.cfs.data.markFlushing(memtable);
                 if (memtable.isClean() || truncate)
                 {
-                    memtable.cfs.replaceFlushed(memtable, null);
+                    memtable.cfs.data.replaceFlushed(memtable, Collections.emptyList());
+                    memtable.cfs.compactionStrategyManager.replaceFlushed(memtable, Collections.emptyList());
                     reclaim(memtable);
                     iter.remove();
                 }
             }
 
-            if (memtables.isEmpty())
-            {
-                postFlush.latch.countDown();
-                return;
-            }
-
             metric.memtableSwitchCount.inc();
 
             try
             {
                 for (Memtable memtable : memtables)
                 {
-                    // flush the memtable
-                    MoreExecutors.sameThreadExecutor().execute(memtable.flushRunnable());
+                    Collection<SSTableReader> readers = memtable.flush();
+                    memtable.cfs.data.replaceFlushed(memtable, readers);
                     reclaim(memtable);
+                    this.readers.add(readers);
                 }
             }
             catch (FSWriteError e)
@@ -1074,6 +1087,38 @@ public class ColumnFamilyStore implements ColumnFamilyStoreMBean
         }
     }
 
+    // atomically set the upper bound for the commit log
+    private static void setCommitLogUpperBound(AtomicReference<ReplayPosition> commitLogUpperBound)
+    {
+        // we attempt to set the holder to the current commit log context. at the same time all writes to the memtables are
+        // also maintaining this value, so if somebody sneaks ahead of us somehow (should be rare) we simply retry,
+        // so that we know all operations prior to the position have not reached it yet
+        ReplayPosition lastReplayPosition;
+        while (true)
+        {
+            lastReplayPosition = new Memtable.LastReplayPosition(CommitLog.instance.getContext());
+            ReplayPosition currentLast = commitLogUpperBound.get();
+            if ((currentLast == null || currentLast.compareTo(lastReplayPosition) <= 0)
+                && commitLogUpperBound.compareAndSet(currentLast, lastReplayPosition))
+                break;
+        }
+    }
+
+    @VisibleForTesting
+    // this method should ONLY be used for testing commit log behaviour; it discards the current memtable
+    // contents without marking the commit log clean, and prevents any proceeding flushes from marking
+    // the commit log as done, however they *will* terminate (unlike under typical failures) to ensure progress is made
+    public void simulateFailedFlush()
+    {
+        discardFlushResults = this;
+        data.markFlushing(data.switchMemtable(false, new Memtable(new AtomicReference<>(CommitLog.instance.getContext()), this)));
+    }
+
+    public void resumeFlushing()
+    {
+        discardFlushResults = null;
+    }
+
     /**
      * Finds the largest memtable, as a percentage of *either* on- or off-heap memory limits, and immediately
      * queues it for flushing. If the memtable selected is flushed before this completes, no work is done.
@@ -1406,6 +1451,16 @@ public class ColumnFamilyStore implements ColumnFamilyStoreMBean
         return data;
     }
 
+    public Collection<SSTableReader> getSSTables()
+    {
+        return data.getSSTables();
+    }
+
+    public Iterable<SSTableReader> getPermittedToCompactSSTables()
+    {
+        return data.getPermittedToCompact();
+    }
+
     public Set<SSTableReader> getLiveSSTables()
     {
         return data.getView().liveSSTables();
@@ -1910,40 +1965,52 @@ public class ColumnFamilyStore implements ColumnFamilyStoreMBean
         // position in the System keyspace.
         logger.trace("truncating {}", name);
 
-        if (keyspace.getMetadata().params.durableWrites || DatabaseDescriptor.isAutoSnapshot())
-        {
-            // flush the CF being truncated before forcing the new segment
-            forceBlockingFlush();
+        final long truncatedAt;
+        final ReplayPosition replayAfter;
 
-            viewManager.forceBlockingFlush();
-
-            // sleep a little to make sure that our truncatedAt comes after any sstable
-            // that was part of the flushed we forced; otherwise on a tie, it won't get deleted.
-            Uninterruptibles.sleepUninterruptibly(1, TimeUnit.MILLISECONDS);
-        }
-        else
+        synchronized (data)
         {
-            dumpMemtable();
-            viewManager.dumpMemtables();
+            if (keyspace.getMetadata().params.durableWrites || DatabaseDescriptor.isAutoSnapshot())
+            {
+                replayAfter = forceBlockingFlush();
+                viewManager.forceBlockingFlush();
+            }
+            else
+            {
+                // just nuke the memtable data w/o writing to disk first
+                viewManager.dumpMemtables();
+                try
+                {
+                    replayAfter = dumpMemtable().get();
+                }
+                catch (Exception e)
+                {
+                    throw new RuntimeException(e);
+                }
+            }
+
+            long now = System.currentTimeMillis();
+            // make sure none of our sstables are somehow in the future (clock drift, perhaps)
+            for (ColumnFamilyStore cfs : concatWithIndexes())
+                for (SSTableReader sstable : cfs.data.getSSTables())
+                    now = Math.max(now, sstable.maxDataAge);
+            truncatedAt = now;
         }
 
         Runnable truncateRunnable = new Runnable()
         {
             public void run()
             {
-                logger.trace("Discarding sstable data for truncated CF + indexes");
-
-                final long truncatedAt = System.currentTimeMillis();
+                logger.debug("Discarding sstable data for truncated CF + indexes");
                 data.notifyTruncated(truncatedAt);
 
                 if (DatabaseDescriptor.isAutoSnapshot())
                     snapshot(Keyspace.getTimestampedSnapshotName(name));
 
-                ReplayPosition replayAfter = discardSSTables(truncatedAt);
+                discardSSTables(truncatedAt);
 
                 indexManager.truncateAllIndexesBlocking(truncatedAt);
-
-                viewManager.truncateBlocking(truncatedAt);
+                viewManager.truncateBlocking(replayAfter, truncatedAt);
 
                 SystemKeyspace.saveTruncationRecord(ColumnFamilyStore.this, truncatedAt, replayAfter);
                 logger.trace("cleaning out row cache");
@@ -1958,13 +2025,13 @@ public class ColumnFamilyStore implements ColumnFamilyStoreMBean
     /**
      * Drops current memtable without flushing to disk. This should only be called when truncating a column family which is not durable.
      */
-    public void dumpMemtable()
+    public Future<ReplayPosition> dumpMemtable()
     {
         synchronized (data)
         {
             final Flush flush = new Flush(true);
             flushExecutor.execute(flush);
-            postFlushExecutor.submit(flush.postFlush);
+            return postFlushExecutor.submit(flush.postFlush);
         }
     }
 
@@ -2024,7 +2091,9 @@ public class ColumnFamilyStore implements ColumnFamilyStoreMBean
             public LifecycleTransaction call() throws Exception
             {
                 assert data.getCompacting().isEmpty() : data.getCompacting();
-                Collection<SSTableReader> sstables = Lists.newArrayList(AbstractCompactionStrategy.filterSuspectSSTables(getSSTables(SSTableSet.LIVE)));
+                Iterable<SSTableReader> sstables = getPermittedToCompactSSTables();
+                sstables = AbstractCompactionStrategy.filterSuspectSSTables(sstables);
+                sstables = ImmutableList.copyOf(sstables);
                 LifecycleTransaction modifier = data.tryModify(sstables, operationType);
                 assert modifier != null: "something marked things compacting while compactions are disabled";
                 return modifier;
@@ -2291,10 +2360,8 @@ public class ColumnFamilyStore implements ColumnFamilyStoreMBean
      *
      * @param truncatedAt The timestamp of the truncation
      *                    (all SSTables before that timestamp are going be marked as compacted)
-     *
-     * @return the most recent replay position of the truncated data
      */
-    public ReplayPosition discardSSTables(long truncatedAt)
+    public void discardSSTables(long truncatedAt)
     {
         assert data.getCompacting().isEmpty() : data.getCompacting();
 
@@ -2306,11 +2373,8 @@ public class ColumnFamilyStore implements ColumnFamilyStoreMBean
                 truncatedSSTables.add(sstable);
         }
 
-        if (truncatedSSTables.isEmpty())
-            return ReplayPosition.NONE;
-
-        markObsolete(truncatedSSTables, OperationType.UNKNOWN);
-        return ReplayPosition.getReplayPosition(truncatedSSTables);
+        if (!truncatedSSTables.isEmpty())
+            markObsolete(truncatedSSTables, OperationType.UNKNOWN);
     }
 
     public double getDroppableTombstoneRatio()
diff --git a/src/java/org/apache/cassandra/db/Directories.java b/src/java/org/apache/cassandra/db/Directories.java
index 5f23baa922..e00c8b92c2 100644
--- a/src/java/org/apache/cassandra/db/Directories.java
+++ b/src/java/org/apache/cassandra/db/Directories.java
@@ -385,7 +385,7 @@ public class Directories
 
         if (candidates.isEmpty())
             if (tooBig)
-                return null;
+                throw new RuntimeException("Insufficient disk space to write " + writeSize + " bytes");
             else
                 throw new FSWriteError(new IOException("All configured data directories have been blacklisted as unwritable for erroring out"), "");
 
diff --git a/src/java/org/apache/cassandra/db/Memtable.java b/src/java/org/apache/cassandra/db/Memtable.java
index 5d5f7bf009..93dc5afc23 100644
--- a/src/java/org/apache/cassandra/db/Memtable.java
+++ b/src/java/org/apache/cassandra/db/Memtable.java
@@ -70,14 +70,17 @@ public class Memtable implements Comparable<Memtable>
 
     // the write barrier for directing writes to this memtable during a switch
     private volatile OpOrder.Barrier writeBarrier;
-    // the last ReplayPosition owned by this Memtable; all ReplayPositions lower are owned by this or an earlier Memtable
-    private volatile AtomicReference<ReplayPosition> lastReplayPosition;
-    // the "first" ReplayPosition owned by this Memtable; this is inaccurate, and only used as a convenience to prevent CLSM flushing wantonly
-    private final ReplayPosition minReplayPosition = CommitLog.instance.getContext();
+    // the precise upper bound of ReplayPosition owned by this memtable
+    private volatile AtomicReference<ReplayPosition> commitLogUpperBound;
+    // the precise lower bound of ReplayPosition owned by this memtable; equal to its predecessor's commitLogUpperBound
+    private AtomicReference<ReplayPosition> commitLogLowerBound;
+    // the approximate lower bound by this memtable; must be <= commitLogLowerBound once our predecessor
+    // has been finalised, and this is enforced in the ColumnFamilyStore.setCommitLogUpperBound
+    private final ReplayPosition approximateCommitLogLowerBound = CommitLog.instance.getContext();
 
     public int compareTo(Memtable that)
     {
-        return this.minReplayPosition.compareTo(that.minReplayPosition);
+        return this.approximateCommitLogLowerBound.compareTo(that.approximateCommitLogLowerBound);
     }
 
     public static final class LastReplayPosition extends ReplayPosition
@@ -92,7 +95,6 @@ public class Memtable implements Comparable<Memtable>
     // actually only store DecoratedKey.
     private final ConcurrentNavigableMap<PartitionPosition, AtomicBTreePartition> partitions = new ConcurrentSkipListMap<>();
     public final ColumnFamilyStore cfs;
-    private final long creationTime = System.currentTimeMillis();
     private final long creationNano = System.nanoTime();
 
     // The smallest timestamp for all partitions stored in this memtable
@@ -106,9 +108,11 @@ public class Memtable implements Comparable<Memtable>
     private final ColumnsCollector columnsCollector;
     private final StatsCollector statsCollector = new StatsCollector();
 
-    public Memtable(ColumnFamilyStore cfs)
+    // only to be used by init(), to setup the very first memtable for the cfs
+    public Memtable(AtomicReference<ReplayPosition> commitLogLowerBound, ColumnFamilyStore cfs)
     {
         this.cfs = cfs;
+        this.commitLogLowerBound = commitLogLowerBound;
         this.allocator = MEMORY_POOL.newAllocator();
         this.initialComparator = cfs.metadata.comparator;
         this.cfs.scheduleFlush();
@@ -144,7 +148,7 @@ public class Memtable implements Comparable<Memtable>
     public void setDiscarding(OpOrder.Barrier writeBarrier, AtomicReference<ReplayPosition> lastReplayPosition)
     {
         assert this.writeBarrier == null;
-        this.lastReplayPosition = lastReplayPosition;
+        this.commitLogUpperBound = lastReplayPosition;
         this.writeBarrier = writeBarrier;
         allocator.setDiscarding();
     }
@@ -174,16 +178,21 @@ public class Memtable implements Comparable<Memtable>
             // its current value and ours; if it HAS been finalised, we simply accept its judgement
             // this permits us to coordinate a safe boundary, as the boundary choice is made
             // atomically wrt our max() maintenance, so an operation cannot sneak into the past
-            ReplayPosition currentLast = lastReplayPosition.get();
+            ReplayPosition currentLast = commitLogUpperBound.get();
             if (currentLast instanceof LastReplayPosition)
                 return currentLast.compareTo(replayPosition) >= 0;
             if (currentLast != null && currentLast.compareTo(replayPosition) >= 0)
                 return true;
-            if (lastReplayPosition.compareAndSet(currentLast, replayPosition))
+            if (commitLogUpperBound.compareAndSet(currentLast, replayPosition))
                 return true;
         }
     }
 
+    public ReplayPosition getCommitLogLowerBound()
+    {
+        return commitLogLowerBound.get();
+    }
+
     public boolean isLive()
     {
         return allocator.isLive();
@@ -194,9 +203,9 @@ public class Memtable implements Comparable<Memtable>
         return partitions.isEmpty();
     }
 
-    public boolean isCleanAfter(ReplayPosition position)
+    public boolean mayContainDataBefore(ReplayPosition position)
     {
-        return isClean() || (position != null && minReplayPosition.compareTo(position) >= 0);
+        return approximateCommitLogLowerBound.compareTo(position) < 0;
     }
 
     /**
@@ -254,11 +263,6 @@ public class Memtable implements Comparable<Memtable>
         return partitions.size();
     }
 
-    public FlushRunnable flushRunnable()
-    {
-        return new FlushRunnable(lastReplayPosition.get());
-    }
-
     public String toString()
     {
         return String.format("Memtable-%s@%s(%s serialized bytes, %s ops, %.0f%%/%.0f%% of on/off-heap limit)",
@@ -311,9 +315,15 @@ public class Memtable implements Comparable<Memtable>
         return partitions.get(key);
     }
 
-    public long creationTime()
+    public Collection<SSTableReader> flush()
     {
-        return creationTime;
+        long estimatedSize = estimatedSize();
+        Directories.DataDirectory dataDirectory = cfs.getDirectories().getWriteableLocation(estimatedSize);
+        if (dataDirectory == null)
+            throw new RuntimeException("Insufficient disk space to write " + estimatedSize + " bytes");
+        File sstableDirectory = cfs.getDirectories().getLocationForDisk(dataDirectory);
+        assert sstableDirectory != null : "Flush task is not bound to any disk";
+        return writeSortedContents(sstableDirectory);
     }
 
     public long getMinTimestamp()
@@ -321,136 +331,109 @@ public class Memtable implements Comparable<Memtable>
         return minTimestamp;
     }
 
-    class FlushRunnable extends DiskAwareRunnable
+    private long estimatedSize()
     {
-        private final ReplayPosition context;
-        private final long estimatedSize;
-
-        private final boolean isBatchLogTable;
-
-        FlushRunnable(ReplayPosition context)
+        long keySize = 0;
+        for (PartitionPosition key : partitions.keySet())
         {
-            this.context = context;
+            //  make sure we don't write non-sensical keys
+            assert key instanceof DecoratedKey;
+            keySize += ((DecoratedKey)key).getKey().remaining();
+        }
+        return (long) ((keySize // index entries
+                        + keySize // keys in data file
+                        + liveDataSize.get()) // data
+                       * 1.2); // bloom filter and row index overhead
+    }
 
-            long keySize = 0;
-            for (PartitionPosition key : partitions.keySet())
+    private Collection<SSTableReader> writeSortedContents(File sstableDirectory)
+    {
+        boolean isBatchLogTable = cfs.name.equals(SystemKeyspace.BATCHES) && cfs.keyspace.getName().equals(SystemKeyspace.NAME);
+
+        logger.debug("Writing {}", Memtable.this.toString());
+
+        Collection<SSTableReader> ssTables;
+        try (SSTableTxnWriter writer = createFlushWriter(cfs.getSSTablePath(sstableDirectory), columnsCollector.get(), statsCollector.get()))
+        {
+            boolean trackContention = logger.isTraceEnabled();
+            int heavilyContendedRowCount = 0;
+            // (we can't clear out the map as-we-go to free up memory,
+            //  since the memtable is being used for queries in the "pending flush" category)
+            for (AtomicBTreePartition partition : partitions.values())
             {
-                //  make sure we don't write non-sensical keys
-                assert key instanceof DecoratedKey;
-                keySize += ((DecoratedKey)key).getKey().remaining();
-            }
-            estimatedSize = (long) ((keySize // index entries
-                                    + keySize // keys in data file
-                                    + liveDataSize.get()) // data
-                                    * 1.2); // bloom filter and row index overhead
+                // Each batchlog partition is a separate entry in the log. And for an entry, we only do 2
+                // operations: 1) we insert the entry and 2) we delete it. Further, BL data is strictly local,
+                // we don't need to preserve tombstones for repair. So if both operation are in this
+                // memtable (which will almost always be the case if there is no ongoing failure), we can
+                // just skip the entry (CASSANDRA-4667).
+                if (isBatchLogTable && !partition.partitionLevelDeletion().isLive() && partition.hasRows())
+                    continue;
 
-            this.isBatchLogTable = cfs.name.equals(SystemKeyspace.BATCHES) && cfs.keyspace.getName().equals(SystemKeyspace.NAME);
-        }
+                if (trackContention && partition.usePessimisticLocking())
+                    heavilyContendedRowCount++;
 
-        public long getExpectedWriteSize()
-        {
-            return estimatedSize;
-        }
-
-        protected void runMayThrow() throws Exception
-        {
-            long writeSize = getExpectedWriteSize();
-            Directories.DataDirectory dataDirectory = getWriteDirectory(writeSize);
-            File sstableDirectory = cfs.getDirectories().getLocationForDisk(dataDirectory);
-            assert sstableDirectory != null : "Flush task is not bound to any disk";
-            Collection<SSTableReader> sstables = writeSortedContents(context, sstableDirectory);
-            cfs.replaceFlushed(Memtable.this, sstables);
-        }
-
-        protected Directories getDirectories()
-        {
-            return cfs.getDirectories();
-        }
-
-        private Collection<SSTableReader> writeSortedContents(ReplayPosition context, File sstableDirectory)
-        {
-            logger.debug("Writing {}", Memtable.this.toString());
-
-            Collection<SSTableReader> ssTables;
-            try (SSTableTxnWriter writer = createFlushWriter(cfs.getSSTablePath(sstableDirectory), columnsCollector.get(), statsCollector.get()))
-            {
-                boolean trackContention = logger.isTraceEnabled();
-                int heavilyContendedRowCount = 0;
-                // (we can't clear out the map as-we-go to free up memory,
-                //  since the memtable is being used for queries in the "pending flush" category)
-                for (AtomicBTreePartition partition : partitions.values())
+                if (!partition.isEmpty())
                 {
-                    // Each batchlog partition is a separate entry in the log. And for an entry, we only do 2
-                    // operations: 1) we insert the entry and 2) we delete it. Further, BL data is strictly local,
-                    // we don't need to preserve tombstones for repair. So if both operation are in this
-                    // memtable (which will almost always be the case if there is no ongoing failure), we can
-                    // just skip the entry (CASSANDRA-4667).
-                    if (isBatchLogTable && !partition.partitionLevelDeletion().isLive() && partition.hasRows())
-                        continue;
-
-                    if (trackContention && partition.usePessimisticLocking())
-                        heavilyContendedRowCount++;
-
-                    if (!partition.isEmpty())
+                    try (UnfilteredRowIterator iter = partition.unfilteredIterator())
                     {
-                        try (UnfilteredRowIterator iter = partition.unfilteredIterator())
-                        {
-                            writer.append(iter);
-                        }
+                        writer.append(iter);
                     }
                 }
-
-                if (writer.getFilePointer() > 0)
-                {
-                    logger.debug(String.format("Completed flushing %s (%s) for commitlog position %s",
-                                               writer.getFilename(),
-                                               FBUtilities.prettyPrintMemory(writer.getFilePointer()),
-                                               context));
-
-                    // sstables should contain non-repaired data.
-                    ssTables = writer.finish(true);
-                }
-                else
-                {
-                    logger.debug("Completed flushing {}; nothing needed to be retained.  Commitlog position was {}",
-                                writer.getFilename(), context);
-                    writer.abort();
-                    ssTables = null;
-                }
-
-                if (heavilyContendedRowCount > 0)
-                    logger.trace(String.format("High update contention in %d/%d partitions of %s ", heavilyContendedRowCount, partitions.size(), Memtable.this.toString()));
-
-                return ssTables;
             }
+
+            if (writer.getFilePointer() > 0)
+            {
+                logger.debug(String.format("Completed flushing %s (%s) for commitlog position %s",
+                                           writer.getFilename(),
+                                           FBUtilities.prettyPrintMemory(writer.getFilePointer()),
+                                           commitLogUpperBound));
+
+                // sstables should contain non-repaired data.
+                ssTables = writer.finish(true);
+            }
+            else
+            {
+                logger.debug("Completed flushing {}; nothing needed to be retained.  Commitlog position was {}",
+                             writer.getFilename(), commitLogUpperBound);
+                writer.abort();
+                ssTables = Collections.emptyList();
+            }
+
+            if (heavilyContendedRowCount > 0)
+                logger.trace(String.format("High update contention in %d/%d partitions of %s ", heavilyContendedRowCount, partitions.size(), Memtable.this.toString()));
+
+            return ssTables;
         }
+    }
 
-        @SuppressWarnings("resource") // log and writer closed by SSTableTxnWriter
-        public SSTableTxnWriter createFlushWriter(String filename,
-                                               PartitionColumns columns,
-                                               EncodingStats stats)
+    @SuppressWarnings("resource") // log and writer closed by SSTableTxnWriter
+    public SSTableTxnWriter createFlushWriter(String filename,
+                                              PartitionColumns columns,
+                                              EncodingStats stats)
+    {
+        // we operate "offline" here, as we expose the resulting reader consciously when done
+        // (although we may want to modify this behaviour in future, to encapsulate full flush behaviour in LifecycleTransaction)
+        LifecycleTransaction txn = null;
+        try
         {
-            // we operate "offline" here, as we expose the resulting reader consciously when done
-            // (although we may want to modify this behaviour in future, to encapsulate full flush behaviour in LifecycleTransaction)
-            LifecycleTransaction txn = null;
-            try
-            {
-                txn = LifecycleTransaction.offline(OperationType.FLUSH);
-                MetadataCollector sstableMetadataCollector = new MetadataCollector(cfs.metadata.comparator).replayPosition(context);
-                return new SSTableTxnWriter(txn,
-                                            cfs.createSSTableMultiWriter(Descriptor.fromFilename(filename),
-                                                                         (long) partitions.size(),
-                                                                         ActiveRepairService.UNREPAIRED_SSTABLE,
-                                                                         sstableMetadataCollector,
-                                                                         new SerializationHeader(true, cfs.metadata, columns, stats),
-                                                                         txn));
-            }
-            catch (Throwable t)
-            {
-                if (txn != null)
-                    txn.close();
-                throw t;
-            }
+            txn = LifecycleTransaction.offline(OperationType.FLUSH);
+            MetadataCollector sstableMetadataCollector = new MetadataCollector(cfs.metadata.comparator)
+                                                         .commitLogLowerBound(commitLogLowerBound.get())
+                                                         .commitLogUpperBound(commitLogUpperBound.get());
+
+            return new SSTableTxnWriter(txn,
+                                        cfs.createSSTableMultiWriter(Descriptor.fromFilename(filename),
+                                                                     (long) partitions.size(),
+                                                                     ActiveRepairService.UNREPAIRED_SSTABLE,
+                                                                     sstableMetadataCollector,
+                                                                     new SerializationHeader(true, cfs.metadata, columns, stats),
+                                                                     txn));
+        }
+        catch (Throwable t)
+        {
+            if (txn != null)
+                txn.close();
+            throw t;
         }
     }
 
diff --git a/src/java/org/apache/cassandra/db/commitlog/CommitLogReplayer.java b/src/java/org/apache/cassandra/db/commitlog/CommitLogReplayer.java
index 7169b2f6db..f45a47aa43 100644
--- a/src/java/org/apache/cassandra/db/commitlog/CommitLogReplayer.java
+++ b/src/java/org/apache/cassandra/db/commitlog/CommitLogReplayer.java
@@ -35,7 +35,6 @@ import com.google.common.base.Throwables;
 import com.google.common.collect.HashMultimap;
 import com.google.common.collect.Iterables;
 import com.google.common.collect.Multimap;
-import com.google.common.collect.Ordering;
 import com.google.common.util.concurrent.Uninterruptibles;
 
 import org.apache.commons.lang3.StringUtils;
@@ -48,7 +47,6 @@ import org.apache.cassandra.config.Schema;
 import org.apache.cassandra.db.*;
 import org.apache.cassandra.db.rows.SerializationHelper;
 import org.apache.cassandra.db.partitions.PartitionUpdate;
-import org.apache.cassandra.db.lifecycle.SSTableSet;
 import org.apache.cassandra.exceptions.ConfigurationException;
 import org.apache.cassandra.io.util.FileSegmentInputStream;
 import org.apache.cassandra.io.util.RebufferingInputStream;
@@ -76,7 +74,7 @@ public class CommitLogReplayer
     private final List<Future<?>> futures;
     private final Map<UUID, AtomicInteger> invalidMutations;
     private final AtomicInteger replayedCount;
-    private final Map<UUID, ReplayPosition> cfPositions;
+    private final Map<UUID, ReplayPosition.ReplayFilter> cfPersisted;
     private final ReplayPosition globalPosition;
     private final CRC32 checksum;
     private byte[] buffer;
@@ -85,7 +83,7 @@ public class CommitLogReplayer
     private final ReplayFilter replayFilter;
     private final CommitLogArchiver archiver;
 
-    CommitLogReplayer(CommitLog commitLog, ReplayPosition globalPosition, Map<UUID, ReplayPosition> cfPositions, ReplayFilter replayFilter)
+    CommitLogReplayer(CommitLog commitLog, ReplayPosition globalPosition, Map<UUID, ReplayPosition.ReplayFilter> cfPersisted, ReplayFilter replayFilter)
     {
         this.keyspacesRecovered = new NonBlockingHashSet<Keyspace>();
         this.futures = new ArrayList<Future<?>>();
@@ -95,7 +93,7 @@ public class CommitLogReplayer
         // count the number of replayed mutation. We don't really care about atomicity, but we need it to be a reference.
         this.replayedCount = new AtomicInteger();
         this.checksum = new CRC32();
-        this.cfPositions = cfPositions;
+        this.cfPersisted = cfPersisted;
         this.globalPosition = globalPosition;
         this.replayFilter = replayFilter;
         this.archiver = commitLog.archiver;
@@ -104,16 +102,11 @@ public class CommitLogReplayer
     public static CommitLogReplayer construct(CommitLog commitLog)
     {
         // compute per-CF and global replay positions
-        Map<UUID, ReplayPosition> cfPositions = new HashMap<UUID, ReplayPosition>();
-        Ordering<ReplayPosition> replayPositionOrdering = Ordering.from(ReplayPosition.comparator);
+        Map<UUID, ReplayPosition.ReplayFilter> cfPersisted = new HashMap<>();
         ReplayFilter replayFilter = ReplayFilter.create();
+        ReplayPosition globalPosition = null;
         for (ColumnFamilyStore cfs : ColumnFamilyStore.all())
         {
-            // it's important to call RP.gRP per-cf, before aggregating all the positions w/ the Ordering.min call
-            // below: gRP will return NONE if there are no flushed sstables, which is important to have in the
-            // list (otherwise we'll just start replay from the first flush position that we do have, which is not correct).
-            ReplayPosition rp = ReplayPosition.getReplayPosition(cfs.getSSTables(SSTableSet.CANONICAL));
-
             // but, if we've truncated the cf in question, then we need to need to start replay after the truncation
             ReplayPosition truncatedAt = SystemKeyspace.getTruncatedPosition(cfs.metadata.cfId);
             if (truncatedAt != null)
@@ -131,19 +124,21 @@ public class CommitLogReplayer
                                     cfs.metadata.ksName,
                                     cfs.metadata.cfName);
                         SystemKeyspace.removeTruncationRecord(cfs.metadata.cfId);
+                        truncatedAt = null;
                     }
                 }
-                else
-                {
-                    rp = replayPositionOrdering.max(Arrays.asList(rp, truncatedAt));
-                }
             }
 
-            cfPositions.put(cfs.metadata.cfId, rp);
+            ReplayPosition.ReplayFilter filter = new ReplayPosition.ReplayFilter(cfs.getSSTables(), truncatedAt);
+            if (!filter.isEmpty())
+                cfPersisted.put(cfs.metadata.cfId, filter);
+            else
+                globalPosition = ReplayPosition.NONE; // if we have no ranges for this CF, we must replay everything and filter
         }
-        ReplayPosition globalPosition = replayPositionOrdering.min(cfPositions.values());
-        logger.trace("Global replay position is {} from columnfamilies {}", globalPosition, FBUtilities.toString(cfPositions));
-        return new CommitLogReplayer(commitLog, globalPosition, cfPositions, replayFilter);
+        if (globalPosition == null)
+            globalPosition = ReplayPosition.firstNotCovered(cfPersisted.values());
+        logger.debug("Global replay position is {} from columnfamilies {}", globalPosition, FBUtilities.toString(cfPersisted));
+        return new CommitLogReplayer(commitLog, globalPosition, cfPersisted, replayFilter);
     }
 
     public void recover(File[] clogs) throws IOException
@@ -290,6 +285,19 @@ public class CommitLogReplayer
         }
     }
 
+    /**
+     * consult the known-persisted ranges for our sstables;
+     * if the position is covered by one of them it does not need to be replayed
+     *
+     * @return true iff replay is necessary
+     */
+    private boolean shouldReplay(UUID cfId, ReplayPosition position)
+    {
+        ReplayPosition.ReplayFilter filter = cfPersisted.get(cfId);
+        return filter == null || filter.shouldReplay(position);
+    }
+
+    @SuppressWarnings("resource")
     public void recover(File file, boolean tolerateTruncation) throws IOException
     {
         CommitLogDescriptor desc = CommitLogDescriptor.fromFileName(file.getName());
@@ -508,7 +516,7 @@ public class CommitLogReplayer
                                   mutationStart, errorContext);
                 continue;
             }
-            replayMutation(buffer, serializedSize, reader.getFilePointer(), desc);
+            replayMutation(buffer, serializedSize, (int) reader.getFilePointer(), desc);
         }
         return true;
     }
@@ -517,7 +525,7 @@ public class CommitLogReplayer
      * Deserializes and replays a commit log entry.
      */
     void replayMutation(byte[] inputBuffer, int size,
-            final long entryLocation, final CommitLogDescriptor desc) throws IOException
+            final int entryLocation, final CommitLogDescriptor desc) throws IOException
     {
 
         final Mutation mutation;
@@ -589,11 +597,9 @@ public class CommitLogReplayer
                     if (Schema.instance.getCF(update.metadata().cfId) == null)
                         continue; // dropped
 
-                    ReplayPosition rp = cfPositions.get(update.metadata().cfId);
-
                     // replay if current segment is newer than last flushed one or,
                     // if it is the last known segment, if we are after the replay position
-                    if (desc.id > rp.segment || (desc.id == rp.segment && entryLocation > rp.position))
+                    if (shouldReplay(update.metadata().cfId, new ReplayPosition(desc.id, entryLocation)))
                     {
                         if (newMutation == null)
                             newMutation = new Mutation(mutation.getKeyspaceName(), mutation.key());
diff --git a/src/java/org/apache/cassandra/db/commitlog/ReplayPosition.java b/src/java/org/apache/cassandra/db/commitlog/ReplayPosition.java
index 28416f3dd2..0b21763af8 100644
--- a/src/java/org/apache/cassandra/db/commitlog/ReplayPosition.java
+++ b/src/java/org/apache/cassandra/db/commitlog/ReplayPosition.java
@@ -18,10 +18,10 @@
 package org.apache.cassandra.db.commitlog;
 
 import java.io.IOException;
-import java.util.Comparator;
+import java.util.Map;
+import java.util.NavigableMap;
+import java.util.TreeMap;
 
-import com.google.common.base.Function;
-import com.google.common.collect.Iterables;
 import com.google.common.collect.Ordering;
 
 import org.apache.cassandra.db.TypeSizes;
@@ -35,46 +35,78 @@ public class ReplayPosition implements Comparable<ReplayPosition>
     public static final ReplayPositionSerializer serializer = new ReplayPositionSerializer();
 
     // NONE is used for SSTables that are streamed from other nodes and thus have no relationship
-    // with our local commitlog. The values satisfy the critera that
+    // with our local commitlog. The values satisfy the criteria that
     //  - no real commitlog segment will have the given id
     //  - it will sort before any real replayposition, so it will be effectively ignored by getReplayPosition
     public static final ReplayPosition NONE = new ReplayPosition(-1, 0);
 
-    /**
-     * Convenience method to compute the replay position for a group of SSTables.
-     * @param sstables
-     * @return the most recent (highest) replay position
-     */
-    public static ReplayPosition getReplayPosition(Iterable<? extends SSTableReader> sstables)
-    {
-        if (Iterables.isEmpty(sstables))
-            return NONE;
-
-        Function<SSTableReader, ReplayPosition> f = new Function<SSTableReader, ReplayPosition>()
-        {
-            public ReplayPosition apply(SSTableReader sstable)
-            {
-                return sstable.getReplayPosition();
-            }
-        };
-        Ordering<ReplayPosition> ordering = Ordering.from(ReplayPosition.comparator);
-        return ordering.max(Iterables.transform(sstables, f));
-    }
-
-
     public final long segment;
     public final int position;
 
-    public static final Comparator<ReplayPosition> comparator = new Comparator<ReplayPosition>()
+    /**
+     * A filter of known safe-to-discard commit log replay positions, based on
+     * the range covered by on disk sstables and those prior to the most recent truncation record
+     */
+    public static class ReplayFilter
     {
-        public int compare(ReplayPosition o1, ReplayPosition o2)
+        final NavigableMap<ReplayPosition, ReplayPosition> persisted = new TreeMap<>();
+        public ReplayFilter(Iterable<SSTableReader> onDisk, ReplayPosition truncatedAt)
         {
-            if (o1.segment != o2.segment)
-            	return Long.compare(o1.segment,  o2.segment);
-
-            return Integer.compare(o1.position, o2.position);
+            for (SSTableReader reader : onDisk)
+            {
+                ReplayPosition start = reader.getSSTableMetadata().commitLogLowerBound;
+                ReplayPosition end = reader.getSSTableMetadata().commitLogUpperBound;
+                add(persisted, start, end);
+            }
+            if (truncatedAt != null)
+                add(persisted, ReplayPosition.NONE, truncatedAt);
         }
-    };
+
+        private static void add(NavigableMap<ReplayPosition, ReplayPosition> ranges, ReplayPosition start, ReplayPosition end)
+        {
+            // extend ourselves to cover any ranges we overlap
+            // record directly preceding our end may extend past us, so take the max of our end and its
+            Map.Entry<ReplayPosition, ReplayPosition> extend = ranges.floorEntry(end);
+            if (extend != null && extend.getValue().compareTo(end) > 0)
+                end = extend.getValue();
+
+            // record directly preceding our start may extend into us; if it does, we take it as our start
+            extend = ranges.lowerEntry(start);
+            if (extend != null && extend.getValue().compareTo(start) >= 0)
+                start = extend.getKey();
+
+            ranges.subMap(start, end).clear();
+            ranges.put(start, end);
+        }
+
+        public boolean shouldReplay(ReplayPosition position)
+        {
+            // replay ranges are start exclusive, end inclusive
+            Map.Entry<ReplayPosition, ReplayPosition> range = persisted.lowerEntry(position);
+            return range == null || position.compareTo(range.getValue()) > 0;
+        }
+
+        public boolean isEmpty()
+        {
+            return persisted.isEmpty();
+        }
+    }
+
+    public static ReplayPosition firstNotCovered(Iterable<ReplayFilter> ranges)
+    {
+        ReplayPosition min = null;
+        for (ReplayFilter map : ranges)
+        {
+            ReplayPosition first = map.persisted.firstEntry().getValue();
+            if (min == null)
+                min = first;
+            else
+                min = Ordering.natural().min(min, first);
+        }
+        if (min == null)
+            return NONE;
+        return min;
+    }
 
     public ReplayPosition(long segment, int position)
     {
@@ -83,9 +115,12 @@ public class ReplayPosition implements Comparable<ReplayPosition>
         this.position = position;
     }
 
-    public int compareTo(ReplayPosition other)
+    public int compareTo(ReplayPosition that)
     {
-        return comparator.compare(this, other);
+        if (this.segment != that.segment)
+            return Long.compare(this.segment, that.segment);
+
+        return Integer.compare(this.position, that.position);
     }
 
     @Override
diff --git a/src/java/org/apache/cassandra/db/compaction/AbstractCompactionStrategy.java b/src/java/org/apache/cassandra/db/compaction/AbstractCompactionStrategy.java
index c205d5c2ce..8928db5df3 100644
--- a/src/java/org/apache/cassandra/db/compaction/AbstractCompactionStrategy.java
+++ b/src/java/org/apache/cassandra/db/compaction/AbstractCompactionStrategy.java
@@ -241,9 +241,6 @@ public abstract class AbstractCompactionStrategy
      */
     public void replaceFlushed(Memtable memtable, Collection<SSTableReader> sstables)
     {
-        cfs.getTracker().replaceFlushed(memtable, sstables);
-        if (sstables != null && !sstables.isEmpty())
-            CompactionManager.instance.submitBackground(cfs);
     }
 
     /**
diff --git a/src/java/org/apache/cassandra/db/compaction/CompactionStrategyManager.java b/src/java/org/apache/cassandra/db/compaction/CompactionStrategyManager.java
index 82fd872349..f1127c9bf1 100644
--- a/src/java/org/apache/cassandra/db/compaction/CompactionStrategyManager.java
+++ b/src/java/org/apache/cassandra/db/compaction/CompactionStrategyManager.java
@@ -189,9 +189,6 @@ public class CompactionStrategyManager implements INotificationConsumer
 
     public void replaceFlushed(Memtable memtable, Collection<SSTableReader> sstables)
     {
-        cfs.getTracker().replaceFlushed(memtable, sstables);
-        if (sstables != null && !sstables.isEmpty())
-            CompactionManager.instance.submitBackground(cfs);
     }
 
     public int getUnleveledSSTables()
diff --git a/src/java/org/apache/cassandra/db/lifecycle/Tracker.java b/src/java/org/apache/cassandra/db/lifecycle/Tracker.java
index c09d49ccd5..16090a116d 100644
--- a/src/java/org/apache/cassandra/db/lifecycle/Tracker.java
+++ b/src/java/org/apache/cassandra/db/lifecycle/Tracker.java
@@ -31,11 +31,13 @@ import com.google.common.collect.*;
 import org.apache.cassandra.db.ColumnFamilyStore;
 import org.apache.cassandra.db.Directories;
 import org.apache.cassandra.db.Memtable;
+import org.apache.cassandra.db.commitlog.CommitLog;
 import org.apache.cassandra.db.commitlog.ReplayPosition;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 import org.apache.cassandra.config.DatabaseDescriptor;
+import org.apache.cassandra.db.compaction.CompactionManager;
 import org.apache.cassandra.db.compaction.OperationType;
 import org.apache.cassandra.io.sstable.format.SSTableReader;
 import org.apache.cassandra.io.util.FileUtils;
@@ -46,6 +48,8 @@ import org.apache.cassandra.utils.Throwables;
 import org.apache.cassandra.utils.concurrent.OpOrder;
 
 import static com.google.common.base.Predicates.and;
+import static com.google.common.base.Predicates.in;
+import static com.google.common.base.Predicates.not;
 import static com.google.common.collect.ImmutableSet.copyOf;
 import static com.google.common.collect.Iterables.filter;
 import static java.util.Collections.singleton;
@@ -195,10 +199,12 @@ public class Tracker
     public void reset()
     {
         view.set(new View(
-                         !isDummy() ? ImmutableList.of(new Memtable(cfstore)) : Collections.<Memtable>emptyList(),
+                         !isDummy() ? ImmutableList.of(new Memtable(new AtomicReference<>(CommitLog.instance.getContext()), cfstore))
+                                    : ImmutableList.<Memtable>of(),
                          ImmutableList.<Memtable>of(),
                          Collections.<SSTableReader, SSTableReader>emptyMap(),
                          Collections.<SSTableReader, SSTableReader>emptyMap(),
+                         Collections.<SSTableReader>emptySet(),
                          SSTableIntervalTree.empty()));
     }
 
@@ -312,9 +318,8 @@ public class Tracker
      *
      * @return the previously active memtable
      */
-    public Memtable switchMemtable(boolean truncating)
+    public Memtable switchMemtable(boolean truncating, Memtable newMemtable)
     {
-        Memtable newMemtable = new Memtable(cfstore);
         Pair<View, View> result = apply(View.switchMemtable(newMemtable));
         if (truncating)
             notifyRenewed(newMemtable);
@@ -330,7 +335,7 @@ public class Tracker
     public void replaceFlushed(Memtable memtable, Collection<SSTableReader> sstables)
     {
         assert !isDummy();
-        if (sstables == null || sstables.isEmpty())
+        if (sstables.isEmpty())
         {
             // sstable may be null if we flushed batchlog and nothing needed to be retained
             // if it's null, we don't care what state the cfstore is in, we just replace it and continue
@@ -346,19 +351,49 @@ public class Tracker
 
         Throwable fail;
         fail = updateSizeTracking(emptySet(), sstables, null);
-        // TODO: if we're invalidated, should we notifyadded AND removed, or just skip both?
-        fail = notifyAdded(sstables, fail);
-
-        if (!isDummy() && !cfstore.isValid())
-            dropSSTables();
 
         maybeFail(fail);
     }
 
+    /**
+     * permit compaction of the provided sstable; this translates to notifying compaction
+     * strategies of its existence, and potentially submitting a background task
+     */
+    public void permitCompactionOfFlushed(Collection<SSTableReader> sstables)
+    {
+        if (sstables.isEmpty())
+            return;
+
+        apply(View.permitCompactionOfFlushed(sstables));
+
+        if (isDummy())
+            return;
+
+        if (cfstore.isValid())
+        {
+            notifyAdded(sstables);
+            CompactionManager.instance.submitBackground(cfstore);
+        }
+        else
+        {
+            dropSSTables();
+        }
+    }
 
 
     // MISCELLANEOUS public utility calls
 
+    public Set<SSTableReader> getSSTables()
+    {
+        return view.get().sstables;
+    }
+
+    public Iterable<SSTableReader> getPermittedToCompact()
+    {
+        View view = this.view.get();
+        return filter(view.sstables, not(in(view.premature)));
+    }
+
     public Set<SSTableReader> getCompacting()
     {
         return view.get().compacting;
diff --git a/src/java/org/apache/cassandra/db/lifecycle/View.java b/src/java/org/apache/cassandra/db/lifecycle/View.java
index b62c7e3b61..17062b418d 100644
--- a/src/java/org/apache/cassandra/db/lifecycle/View.java
+++ b/src/java/org/apache/cassandra/db/lifecycle/View.java
@@ -33,6 +33,7 @@ import org.apache.cassandra.io.sstable.format.SSTableReader;
 import org.apache.cassandra.utils.Interval;
 
 import static com.google.common.base.Predicates.equalTo;
+import static com.google.common.base.Predicates.in;
 import static com.google.common.base.Predicates.not;
 import static com.google.common.collect.ImmutableList.copyOf;
 import static com.google.common.collect.ImmutableList.of;
@@ -40,7 +41,6 @@ import static com.google.common.collect.Iterables.all;
 import static com.google.common.collect.Iterables.concat;
 import static com.google.common.collect.Iterables.filter;
 import static com.google.common.collect.Iterables.transform;
-import static java.util.Collections.singleton;
 import static org.apache.cassandra.db.lifecycle.Helpers.emptySet;
 import static org.apache.cassandra.db.lifecycle.Helpers.filterOut;
 import static org.apache.cassandra.db.lifecycle.Helpers.replace;
@@ -70,6 +70,7 @@ public class View
     public final List<Memtable> flushingMemtables;
     final Set<SSTableReader> compacting;
     final Set<SSTableReader> sstables;
+    final Set<SSTableReader> premature;
     // we use a Map here so that we can easily perform identity checks as well as equality checks.
     // When marking compacting, we now  indicate if we expect the sstables to be present (by default we do),
     // and we then check that not only are they all present in the live set, but that the exact instance present is
@@ -79,7 +80,7 @@ public class View
 
     final SSTableIntervalTree intervalTree;
 
-    View(List<Memtable> liveMemtables, List<Memtable> flushingMemtables, Map<SSTableReader, SSTableReader> sstables, Map<SSTableReader, SSTableReader> compacting, SSTableIntervalTree intervalTree)
+    View(List<Memtable> liveMemtables, List<Memtable> flushingMemtables, Map<SSTableReader, SSTableReader> sstables, Map<SSTableReader, SSTableReader> compacting, Set<SSTableReader> premature, SSTableIntervalTree intervalTree)
     {
         assert liveMemtables != null;
         assert flushingMemtables != null;
@@ -94,6 +95,7 @@ public class View
         this.sstables = sstablesMap.keySet();
         this.compactingMap = compacting;
         this.compacting = compactingMap.keySet();
+        this.premature = premature;
         this.intervalTree = intervalTree;
     }
 
@@ -239,7 +241,7 @@ public class View
                 assert all(mark, Helpers.idIn(view.sstablesMap));
                 return new View(view.liveMemtables, view.flushingMemtables, view.sstablesMap,
                                 replace(view.compactingMap, unmark, mark),
-                                view.intervalTree);
+                                view.premature, view.intervalTree);
             }
         };
     }
@@ -253,7 +255,7 @@ public class View
             public boolean apply(View view)
             {
                 for (SSTableReader reader : readers)
-                    if (view.compacting.contains(reader) || view.sstablesMap.get(reader) != reader || reader.isMarkedCompacted())
+                    if (view.compacting.contains(reader) || view.sstablesMap.get(reader) != reader || reader.isMarkedCompacted() || view.premature.contains(reader))
                         return false;
                 return true;
             }
@@ -270,7 +272,7 @@ public class View
             public View apply(View view)
             {
                 Map<SSTableReader, SSTableReader> sstableMap = replace(view.sstablesMap, remove, add);
-                return new View(view.liveMemtables, view.flushingMemtables, sstableMap, view.compactingMap,
+                return new View(view.liveMemtables, view.flushingMemtables, sstableMap, view.compactingMap, view.premature,
                                 SSTableIntervalTree.build(sstableMap.keySet()));
             }
         };
@@ -285,7 +287,7 @@ public class View
             {
                 List<Memtable> newLive = ImmutableList.<Memtable>builder().addAll(view.liveMemtables).add(newMemtable).build();
                 assert newLive.size() == view.liveMemtables.size() + 1;
-                return new View(newLive, view.flushingMemtables, view.sstablesMap, view.compactingMap, view.intervalTree);
+                return new View(newLive, view.flushingMemtables, view.sstablesMap, view.compactingMap, view.premature, view.intervalTree);
             }
         };
     }
@@ -304,7 +306,7 @@ public class View
                                                            filter(flushing, not(lessThan(toFlush)))));
                 assert newLive.size() == live.size() - 1;
                 assert newFlushing.size() == flushing.size() + 1;
-                return new View(newLive, newFlushing, view.sstablesMap, view.compactingMap, view.intervalTree);
+                return new View(newLive, newFlushing, view.sstablesMap, view.compactingMap, view.premature, view.intervalTree);
             }
         };
     }
@@ -319,17 +321,34 @@ public class View
                 List<Memtable> flushingMemtables = copyOf(filter(view.flushingMemtables, not(equalTo(memtable))));
                 assert flushingMemtables.size() == view.flushingMemtables.size() - 1;
 
-                if (flushed == null)
+                if (flushed == null || flushed.isEmpty())
                     return new View(view.liveMemtables, flushingMemtables, view.sstablesMap,
-                                    view.compactingMap, view.intervalTree);
+                                    view.compactingMap, view.premature, view.intervalTree);
 
                 Map<SSTableReader, SSTableReader> sstableMap = replace(view.sstablesMap, emptySet(), flushed);
-                return new View(view.liveMemtables, flushingMemtables, sstableMap, view.compactingMap,
+                Map<SSTableReader, SSTableReader> compactingMap = replace(view.compactingMap, emptySet(), flushed);
+                Set<SSTableReader> premature = replace(view.premature, emptySet(), flushed);
+                return new View(view.liveMemtables, flushingMemtables, sstableMap, compactingMap, premature,
                                 SSTableIntervalTree.build(sstableMap.keySet()));
             }
         };
     }
 
+    static Function<View, View> permitCompactionOfFlushed(final Collection<SSTableReader> readers)
+    {
+        Set<SSTableReader> expectAndRemove = ImmutableSet.copyOf(readers);
+        return new Function<View, View>()
+        {
+            public View apply(View view)
+            {
+                Set<SSTableReader> premature = replace(view.premature, expectAndRemove, emptySet());
+                Map<SSTableReader, SSTableReader> compactingMap = replace(view.compactingMap, expectAndRemove, emptySet());
+                return new View(view.liveMemtables, view.flushingMemtables, view.sstablesMap, compactingMap, premature, view.intervalTree);
+            }
+        };
+    }
+
+
     private static <T extends Comparable<T>> Predicate<T> lessThan(final T lessThan)
     {
         return new Predicate<T>()
diff --git a/src/java/org/apache/cassandra/db/view/TableViews.java b/src/java/org/apache/cassandra/db/view/TableViews.java
index 893bdd5d34..7feb67c43d 100644
--- a/src/java/org/apache/cassandra/db/view/TableViews.java
+++ b/src/java/org/apache/cassandra/db/view/TableViews.java
@@ -94,11 +94,11 @@ public class TableViews extends AbstractCollection<View>
             viewCfs.dumpMemtable();
     }
 
-    public void truncateBlocking(long truncatedAt)
+    public void truncateBlocking(ReplayPosition replayAfter, long truncatedAt)
     {
         for (ColumnFamilyStore viewCfs : allViewsCfs())
         {
-            ReplayPosition replayAfter = viewCfs.discardSSTables(truncatedAt);
+            viewCfs.discardSSTables(truncatedAt);
             SystemKeyspace.saveTruncationRecord(viewCfs, truncatedAt, replayAfter);
         }
     }
diff --git a/src/java/org/apache/cassandra/io/sstable/format/SSTableReader.java b/src/java/org/apache/cassandra/io/sstable/format/SSTableReader.java
index b9561ec631..9bb1767bf8 100644
--- a/src/java/org/apache/cassandra/io/sstable/format/SSTableReader.java
+++ b/src/java/org/apache/cassandra/io/sstable/format/SSTableReader.java
@@ -1889,11 +1889,6 @@ public abstract class SSTableReader extends SSTable implements SelfRefCounted<SS
         return sstableMetadata.compressionRatio;
     }
 
-    public ReplayPosition getReplayPosition()
-    {
-        return sstableMetadata.replayPosition;
-    }
-
     public long getMinTimestamp()
     {
         return sstableMetadata.minTimestamp;
diff --git a/src/java/org/apache/cassandra/io/sstable/format/Version.java b/src/java/org/apache/cassandra/io/sstable/format/Version.java
index 16829abc2d..d9e289c040 100644
--- a/src/java/org/apache/cassandra/io/sstable/format/Version.java
+++ b/src/java/org/apache/cassandra/io/sstable/format/Version.java
@@ -70,6 +70,8 @@ public abstract class Version
 
     public abstract boolean hasBoundaries();
 
+    public abstract boolean hasCommitLogLowerBound();
+
     public String getVersion()
     {
         return version;
diff --git a/src/java/org/apache/cassandra/io/sstable/format/big/BigFormat.java b/src/java/org/apache/cassandra/io/sstable/format/big/BigFormat.java
index 1f2a98f2e5..e0fb3b1303 100644
--- a/src/java/org/apache/cassandra/io/sstable/format/big/BigFormat.java
+++ b/src/java/org/apache/cassandra/io/sstable/format/big/BigFormat.java
@@ -111,7 +111,7 @@ public class BigFormat implements SSTableFormat
     // we always incremented the major version.
     static class BigVersion extends Version
     {
-        public static final String current_version = "ma";
+        public static final String current_version = "mb";
         public static final String earliest_supported_version = "jb";
 
         // jb (2.0.1): switch from crc32 to adler32 for compression checksums
@@ -121,8 +121,10 @@ public class BigFormat implements SSTableFormat
         //             switch uncompressed checksums to adler32
         //             tracks presense of legacy (local and remote) counter shards
         // la (2.2.0): new file name format
+        // lb (2.2.7): commit log lower bound included
         // ma (3.0.0): swap bf hash order
         //             store rows natively
+        // mb (3.0.6): commit log lower bound included
         //
         // NOTE: when adding a new version, please add that to LegacySSTableTest, too.
 
@@ -142,6 +144,7 @@ public class BigFormat implements SSTableFormat
          * have no 'static' bits caused by using the same upper bits for both bloom filter and token distribution.
          */
         private final boolean hasOldBfHashOrder;
+        private final boolean hasCommitLogLowerBound;
 
         /**
          * CASSANDRA-7066: compaction ancerstors are no longer used and have been removed.
@@ -181,6 +184,8 @@ public class BigFormat implements SSTableFormat
                                           : MessagingService.VERSION_21;
 
             hasBoundaries = version.compareTo("ma") < 0;
+            hasCommitLogLowerBound = (version.compareTo("lb") >= 0 && version.compareTo("ma") < 0)
+                                     || version.compareTo("mb") >= 0;
         }
 
         @Override
@@ -243,6 +248,11 @@ public class BigFormat implements SSTableFormat
             return newFileName;
         }
 
+        public boolean hasCommitLogLowerBound()
+        {
+            return hasCommitLogLowerBound;
+        }
+
         @Override
         public boolean storeRows()
         {
diff --git a/src/java/org/apache/cassandra/io/sstable/metadata/CompactionMetadata.java b/src/java/org/apache/cassandra/io/sstable/metadata/CompactionMetadata.java
index 4f4c04b0a1..ef3453a9d7 100644
--- a/src/java/org/apache/cassandra/io/sstable/metadata/CompactionMetadata.java
+++ b/src/java/org/apache/cassandra/io/sstable/metadata/CompactionMetadata.java
@@ -74,12 +74,21 @@ public class CompactionMetadata extends MetadataComponent
     {
         public int serializedSize(Version version, CompactionMetadata component) throws IOException
         {
+            int sz = 0;
+            if (version.hasCompactionAncestors())
+            {   // write empty ancestor marker
+                sz = 4;
+            }
             byte[] serializedCardinality = component.cardinalityEstimator.getBytes();
-            return TypeSizes.sizeof(serializedCardinality.length) + serializedCardinality.length;
+            return TypeSizes.sizeof(serializedCardinality.length) + serializedCardinality.length + sz;
         }
 
         public void serialize(Version version, CompactionMetadata component, DataOutputPlus out) throws IOException
         {
+            if (version.hasCompactionAncestors())
+            {   // write empty ancestor marker
+                out.writeInt(0);
+            }
             ByteBufferUtil.writeWithLength(component.cardinalityEstimator.getBytes(), out);
         }
 
diff --git a/src/java/org/apache/cassandra/io/sstable/metadata/LegacyMetadataSerializer.java b/src/java/org/apache/cassandra/io/sstable/metadata/LegacyMetadataSerializer.java
index 2ed845cdf6..456152098c 100644
--- a/src/java/org/apache/cassandra/io/sstable/metadata/LegacyMetadataSerializer.java
+++ b/src/java/org/apache/cassandra/io/sstable/metadata/LegacyMetadataSerializer.java
@@ -55,7 +55,7 @@ public class LegacyMetadataSerializer extends MetadataSerializer
 
         EstimatedHistogram.serializer.serialize(stats.estimatedPartitionSize, out);
         EstimatedHistogram.serializer.serialize(stats.estimatedColumnCount, out);
-        ReplayPosition.serializer.serialize(stats.replayPosition, out);
+        ReplayPosition.serializer.serialize(stats.commitLogUpperBound, out);
         out.writeLong(stats.minTimestamp);
         out.writeLong(stats.maxTimestamp);
         out.writeInt(stats.maxLocalDeletionTime);
@@ -71,6 +71,8 @@ public class LegacyMetadataSerializer extends MetadataSerializer
         out.writeInt(stats.maxClusteringValues.size());
         for (ByteBuffer value : stats.maxClusteringValues)
             ByteBufferUtil.writeWithShortLength(value, out);
+        if (version.hasCommitLogLowerBound())
+            ReplayPosition.serializer.serialize(stats.commitLogLowerBound, out);
     }
 
     /**
@@ -92,7 +94,8 @@ public class LegacyMetadataSerializer extends MetadataSerializer
             {
                 EstimatedHistogram partitionSizes = EstimatedHistogram.serializer.deserialize(in);
                 EstimatedHistogram columnCounts = EstimatedHistogram.serializer.deserialize(in);
-                ReplayPosition replayPosition = ReplayPosition.serializer.deserialize(in);
+                ReplayPosition commitLogLowerBound = ReplayPosition.NONE;
+                ReplayPosition commitLogUpperBound = ReplayPosition.serializer.deserialize(in);
                 long minTimestamp = in.readLong();
                 long maxTimestamp = in.readLong();
                 int maxLocalDeletionTime = in.readInt();
@@ -116,6 +119,9 @@ public class LegacyMetadataSerializer extends MetadataSerializer
                 for (int i = 0; i < colCount; i++)
                     maxColumnNames.add(ByteBufferUtil.readWithShortLength(in));
 
+                if (descriptor.version.hasCommitLogLowerBound())
+                    commitLogLowerBound = ReplayPosition.serializer.deserialize(in);
+
                 if (types.contains(MetadataType.VALIDATION))
                     components.put(MetadataType.VALIDATION,
                                    new ValidationMetadata(partitioner, bloomFilterFPChance));
@@ -123,7 +129,8 @@ public class LegacyMetadataSerializer extends MetadataSerializer
                     components.put(MetadataType.STATS,
                                    new StatsMetadata(partitionSizes,
                                                      columnCounts,
-                                                     replayPosition,
+                                                     commitLogLowerBound,
+                                                     commitLogUpperBound,
                                                      minTimestamp,
                                                      maxTimestamp,
                                                      Integer.MAX_VALUE,
diff --git a/src/java/org/apache/cassandra/io/sstable/metadata/MetadataCollector.java b/src/java/org/apache/cassandra/io/sstable/metadata/MetadataCollector.java
index c2b0cafe39..53cf0b0b88 100644
--- a/src/java/org/apache/cassandra/io/sstable/metadata/MetadataCollector.java
+++ b/src/java/org/apache/cassandra/io/sstable/metadata/MetadataCollector.java
@@ -27,6 +27,7 @@ import java.util.Map;
 import java.util.Set;
 
 import com.google.common.collect.Maps;
+import com.google.common.collect.Ordering;
 
 import com.clearspring.analytics.stream.cardinality.HyperLogLogPlus;
 import com.clearspring.analytics.stream.cardinality.ICardinality;
@@ -35,7 +36,6 @@ import org.apache.cassandra.db.commitlog.ReplayPosition;
 import org.apache.cassandra.db.marshal.AbstractType;
 import org.apache.cassandra.db.partitions.PartitionStatisticsCollector;
 import org.apache.cassandra.db.rows.Cell;
-import org.apache.cassandra.io.sstable.Component;
 import org.apache.cassandra.io.sstable.SSTable;
 import org.apache.cassandra.io.sstable.format.SSTableReader;
 import org.apache.cassandra.service.ActiveRepairService;
@@ -70,6 +70,7 @@ public class MetadataCollector implements PartitionStatisticsCollector
         return new StatsMetadata(defaultPartitionSizeHistogram(),
                                  defaultCellPerPartitionCountHistogram(),
                                  ReplayPosition.NONE,
+                                 ReplayPosition.NONE,
                                  Long.MIN_VALUE,
                                  Long.MAX_VALUE,
                                  Integer.MAX_VALUE,
@@ -90,7 +91,8 @@ public class MetadataCollector implements PartitionStatisticsCollector
     protected EstimatedHistogram estimatedPartitionSize = defaultPartitionSizeHistogram();
     // TODO: cound the number of row per partition (either with the number of cells, or instead)
     protected EstimatedHistogram estimatedCellPerPartitionCount = defaultCellPerPartitionCountHistogram();
-    protected ReplayPosition replayPosition = ReplayPosition.NONE;
+    protected ReplayPosition commitLogLowerBound = ReplayPosition.NONE;
+    protected ReplayPosition commitLogUpperBound = ReplayPosition.NONE;
     protected final MinMaxLongTracker timestampTracker = new MinMaxLongTracker();
     protected final MinMaxIntTracker localDeletionTimeTracker = new MinMaxIntTracker(Cell.NO_DELETION_TIME, Cell.NO_DELETION_TIME);
     protected final MinMaxIntTracker ttlTracker = new MinMaxIntTracker(Cell.NO_TTL, Cell.NO_TTL);
@@ -124,7 +126,23 @@ public class MetadataCollector implements PartitionStatisticsCollector
     {
         this(comparator);
 
-        replayPosition(ReplayPosition.getReplayPosition(sstables));
+        ReplayPosition min = null, max = null;
+        for (SSTableReader sstable : sstables)
+        {
+            if (min == null)
+            {
+                min = sstable.getSSTableMetadata().commitLogLowerBound;
+                max = sstable.getSSTableMetadata().commitLogUpperBound;
+            }
+            else
+            {
+                min = Ordering.natural().min(min, sstable.getSSTableMetadata().commitLogLowerBound);
+                max = Ordering.natural().max(max, sstable.getSSTableMetadata().commitLogUpperBound);
+            }
+        }
+
+        commitLogLowerBound(min);
+        commitLogUpperBound(max);
         sstableLevel(level);
     }
 
@@ -211,9 +229,15 @@ public class MetadataCollector implements PartitionStatisticsCollector
         ttlTracker.update(newTTL);
     }
 
-    public MetadataCollector replayPosition(ReplayPosition replayPosition)
+    public MetadataCollector commitLogLowerBound(ReplayPosition commitLogLowerBound)
     {
-        this.replayPosition = replayPosition;
+        this.commitLogLowerBound = commitLogLowerBound;
+        return this;
+    }
+
+    public MetadataCollector commitLogUpperBound(ReplayPosition commitLogUpperBound)
+    {
+        this.commitLogUpperBound = commitLogUpperBound;
         return this;
     }
 
@@ -278,7 +302,8 @@ public class MetadataCollector implements PartitionStatisticsCollector
         components.put(MetadataType.VALIDATION, new ValidationMetadata(partitioner, bloomFilterFPChance));
         components.put(MetadataType.STATS, new StatsMetadata(estimatedPartitionSize,
                                                              estimatedCellPerPartitionCount,
-                                                             replayPosition,
+                                                             commitLogLowerBound,
+                                                             commitLogUpperBound,
                                                              timestampTracker.min(),
                                                              timestampTracker.max(),
                                                              localDeletionTimeTracker.min(),
diff --git a/src/java/org/apache/cassandra/io/sstable/metadata/StatsMetadata.java b/src/java/org/apache/cassandra/io/sstable/metadata/StatsMetadata.java
index 824bf8b5bf..07e35bb72b 100644
--- a/src/java/org/apache/cassandra/io/sstable/metadata/StatsMetadata.java
+++ b/src/java/org/apache/cassandra/io/sstable/metadata/StatsMetadata.java
@@ -42,7 +42,8 @@ public class StatsMetadata extends MetadataComponent
 
     public final EstimatedHistogram estimatedPartitionSize;
     public final EstimatedHistogram estimatedColumnCount;
-    public final ReplayPosition replayPosition;
+    public final ReplayPosition commitLogLowerBound;
+    public final ReplayPosition commitLogUpperBound;
     public final long minTimestamp;
     public final long maxTimestamp;
     public final int minLocalDeletionTime;
@@ -61,7 +62,8 @@ public class StatsMetadata extends MetadataComponent
 
     public StatsMetadata(EstimatedHistogram estimatedPartitionSize,
                          EstimatedHistogram estimatedColumnCount,
-                         ReplayPosition replayPosition,
+                         ReplayPosition commitLogLowerBound,
+                         ReplayPosition commitLogUpperBound,
                          long minTimestamp,
                          long maxTimestamp,
                          int minLocalDeletionTime,
@@ -80,7 +82,8 @@ public class StatsMetadata extends MetadataComponent
     {
         this.estimatedPartitionSize = estimatedPartitionSize;
         this.estimatedColumnCount = estimatedColumnCount;
-        this.replayPosition = replayPosition;
+        this.commitLogLowerBound = commitLogLowerBound;
+        this.commitLogUpperBound = commitLogUpperBound;
         this.minTimestamp = minTimestamp;
         this.maxTimestamp = maxTimestamp;
         this.minLocalDeletionTime = minLocalDeletionTime;
@@ -131,7 +134,8 @@ public class StatsMetadata extends MetadataComponent
     {
         return new StatsMetadata(estimatedPartitionSize,
                                  estimatedColumnCount,
-                                 replayPosition,
+                                 commitLogLowerBound,
+                                 commitLogUpperBound,
                                  minTimestamp,
                                  maxTimestamp,
                                  minLocalDeletionTime,
@@ -153,7 +157,8 @@ public class StatsMetadata extends MetadataComponent
     {
         return new StatsMetadata(estimatedPartitionSize,
                                  estimatedColumnCount,
-                                 replayPosition,
+                                 commitLogLowerBound,
+                                 commitLogUpperBound,
                                  minTimestamp,
                                  maxTimestamp,
                                  minLocalDeletionTime,
@@ -181,7 +186,8 @@ public class StatsMetadata extends MetadataComponent
         return new EqualsBuilder()
                        .append(estimatedPartitionSize, that.estimatedPartitionSize)
                        .append(estimatedColumnCount, that.estimatedColumnCount)
-                       .append(replayPosition, that.replayPosition)
+                       .append(commitLogLowerBound, that.commitLogLowerBound)
+                       .append(commitLogUpperBound, that.commitLogUpperBound)
                        .append(minTimestamp, that.minTimestamp)
                        .append(maxTimestamp, that.maxTimestamp)
                        .append(minLocalDeletionTime, that.minLocalDeletionTime)
@@ -206,7 +212,8 @@ public class StatsMetadata extends MetadataComponent
         return new HashCodeBuilder()
                        .append(estimatedPartitionSize)
                        .append(estimatedColumnCount)
-                       .append(replayPosition)
+                       .append(commitLogLowerBound)
+                       .append(commitLogUpperBound)
                        .append(minTimestamp)
                        .append(maxTimestamp)
                        .append(minLocalDeletionTime)
@@ -232,7 +239,7 @@ public class StatsMetadata extends MetadataComponent
             int size = 0;
             size += EstimatedHistogram.serializer.serializedSize(component.estimatedPartitionSize);
             size += EstimatedHistogram.serializer.serializedSize(component.estimatedColumnCount);
-            size += ReplayPosition.serializer.serializedSize(component.replayPosition);
+            size += ReplayPosition.serializer.serializedSize(component.commitLogUpperBound);
             if (version.storeRows())
                 size += 8 + 8 + 4 + 4 + 4 + 4 + 8 + 8; // mix/max timestamp(long), min/maxLocalDeletionTime(int), min/max TTL, compressionRatio(double), repairedAt (long)
             else
@@ -250,6 +257,8 @@ public class StatsMetadata extends MetadataComponent
             size += TypeSizes.sizeof(component.hasLegacyCounterShards);
             if (version.storeRows())
                 size += 8 + 8; // totalColumnsSet, totalRows
+            if (version.hasCommitLogLowerBound())
+                size += ReplayPosition.serializer.serializedSize(component.commitLogLowerBound);
             return size;
         }
 
@@ -257,7 +266,7 @@ public class StatsMetadata extends MetadataComponent
         {
             EstimatedHistogram.serializer.serialize(component.estimatedPartitionSize, out);
             EstimatedHistogram.serializer.serialize(component.estimatedColumnCount, out);
-            ReplayPosition.serializer.serialize(component.replayPosition, out);
+            ReplayPosition.serializer.serialize(component.commitLogUpperBound, out);
             out.writeLong(component.minTimestamp);
             out.writeLong(component.maxTimestamp);
             if (version.storeRows())
@@ -285,13 +294,17 @@ public class StatsMetadata extends MetadataComponent
                 out.writeLong(component.totalColumnsSet);
                 out.writeLong(component.totalRows);
             }
+
+            if (version.hasCommitLogLowerBound())
+                ReplayPosition.serializer.serialize(component.commitLogLowerBound, out);
         }
 
         public StatsMetadata deserialize(Version version, DataInputPlus in) throws IOException
         {
             EstimatedHistogram partitionSizes = EstimatedHistogram.serializer.deserialize(in);
             EstimatedHistogram columnCounts = EstimatedHistogram.serializer.deserialize(in);
-            ReplayPosition replayPosition = ReplayPosition.serializer.deserialize(in);
+            ReplayPosition commitLogLowerBound = ReplayPosition.NONE, commitLogUpperBound;
+            commitLogUpperBound = ReplayPosition.serializer.deserialize(in);
             long minTimestamp = in.readLong();
             long maxTimestamp = in.readLong();
             // We use MAX_VALUE as that's the default value for "no deletion time"
@@ -323,9 +336,13 @@ public class StatsMetadata extends MetadataComponent
             long totalColumnsSet = version.storeRows() ? in.readLong() : -1L;
             long totalRows = version.storeRows() ? in.readLong() : -1L;
 
+            if (version.hasCommitLogLowerBound())
+                commitLogLowerBound = ReplayPosition.serializer.deserialize(in);
+
             return new StatsMetadata(partitionSizes,
                                      columnCounts,
-                                     replayPosition,
+                                     commitLogLowerBound,
+                                     commitLogUpperBound,
                                      minTimestamp,
                                      maxTimestamp,
                                      minLocalDeletionTime,
diff --git a/src/java/org/apache/cassandra/tools/SSTableMetadataViewer.java b/src/java/org/apache/cassandra/tools/SSTableMetadataViewer.java
index 3728d34808..420b802591 100644
--- a/src/java/org/apache/cassandra/tools/SSTableMetadataViewer.java
+++ b/src/java/org/apache/cassandra/tools/SSTableMetadataViewer.java
@@ -70,7 +70,8 @@ public class SSTableMetadataViewer
                     out.printf("Estimated droppable tombstones: %s%n", stats.getEstimatedDroppableTombstoneRatio((int) (System.currentTimeMillis() / 1000)));
                     out.printf("SSTable Level: %d%n", stats.sstableLevel);
                     out.printf("Repaired at: %d%n", stats.repairedAt);
-                    out.println(stats.replayPosition);
+                    out.printf("Minimum replay position: %s\n", stats.commitLogLowerBound);
+                    out.printf("Maximum replay position: %s\n", stats.commitLogUpperBound);
                     out.println("Estimated tombstone drop times:");
                     for (Map.Entry<Double, Long> entry : stats.estimatedTombstoneDropTime.getAsMap().entrySet())
                     {
diff --git a/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust/mb-1-big-CompressionInfo.db b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust/mb-1-big-CompressionInfo.db
new file mode 100644
index 0000000000..e32d12f780
Binary files /dev/null and b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust/mb-1-big-CompressionInfo.db differ
diff --git a/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust/mb-1-big-Data.db b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust/mb-1-big-Data.db
new file mode 100644
index 0000000000..790cbe16f8
Binary files /dev/null and b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust/mb-1-big-Data.db differ
diff --git a/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust/mb-1-big-Digest.crc32 b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust/mb-1-big-Digest.crc32
new file mode 100644
index 0000000000..66d1d34594
--- /dev/null
+++ b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust/mb-1-big-Digest.crc32
@@ -0,0 +1 @@
+163939259
\ No newline at end of file
diff --git a/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust/mb-1-big-Filter.db b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust/mb-1-big-Filter.db
new file mode 100644
index 0000000000..2e1d5d29ca
Binary files /dev/null and b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust/mb-1-big-Filter.db differ
diff --git a/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust/mb-1-big-Index.db b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust/mb-1-big-Index.db
new file mode 100644
index 0000000000..38d05374a1
Binary files /dev/null and b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust/mb-1-big-Index.db differ
diff --git a/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust/mb-1-big-Statistics.db b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust/mb-1-big-Statistics.db
new file mode 100644
index 0000000000..a53b7c1149
Binary files /dev/null and b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust/mb-1-big-Statistics.db differ
diff --git a/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust/mb-1-big-Summary.db b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust/mb-1-big-Summary.db
new file mode 100644
index 0000000000..9b24e0450c
Binary files /dev/null and b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust/mb-1-big-Summary.db differ
diff --git a/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust/mb-1-big-TOC.txt b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust/mb-1-big-TOC.txt
new file mode 100644
index 0000000000..fe9581f576
--- /dev/null
+++ b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust/mb-1-big-TOC.txt
@@ -0,0 +1,8 @@
+CompressionInfo.db
+Summary.db
+TOC.txt
+Digest.crc32
+Filter.db
+Statistics.db
+Data.db
+Index.db
diff --git a/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust_compact/mb-1-big-CompressionInfo.db b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust_compact/mb-1-big-CompressionInfo.db
new file mode 100644
index 0000000000..e3d437799a
Binary files /dev/null and b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust_compact/mb-1-big-CompressionInfo.db differ
diff --git a/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust_compact/mb-1-big-Data.db b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust_compact/mb-1-big-Data.db
new file mode 100644
index 0000000000..c5aa7ce248
Binary files /dev/null and b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust_compact/mb-1-big-Data.db differ
diff --git a/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust_compact/mb-1-big-Digest.crc32 b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust_compact/mb-1-big-Digest.crc32
new file mode 100644
index 0000000000..4e3bf8955a
--- /dev/null
+++ b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust_compact/mb-1-big-Digest.crc32
@@ -0,0 +1 @@
+3387396134
\ No newline at end of file
diff --git a/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust_compact/mb-1-big-Filter.db b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust_compact/mb-1-big-Filter.db
new file mode 100644
index 0000000000..2e1d5d29ca
Binary files /dev/null and b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust_compact/mb-1-big-Filter.db differ
diff --git a/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust_compact/mb-1-big-Index.db b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust_compact/mb-1-big-Index.db
new file mode 100644
index 0000000000..54afd0cd9d
Binary files /dev/null and b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust_compact/mb-1-big-Index.db differ
diff --git a/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust_compact/mb-1-big-Statistics.db b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust_compact/mb-1-big-Statistics.db
new file mode 100644
index 0000000000..9d9b085252
Binary files /dev/null and b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust_compact/mb-1-big-Statistics.db differ
diff --git a/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust_compact/mb-1-big-Summary.db b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust_compact/mb-1-big-Summary.db
new file mode 100644
index 0000000000..9b24e0450c
Binary files /dev/null and b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust_compact/mb-1-big-Summary.db differ
diff --git a/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust_compact/mb-1-big-TOC.txt b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust_compact/mb-1-big-TOC.txt
new file mode 100644
index 0000000000..fe9581f576
--- /dev/null
+++ b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust_compact/mb-1-big-TOC.txt
@@ -0,0 +1,8 @@
+CompressionInfo.db
+Summary.db
+TOC.txt
+Digest.crc32
+Filter.db
+Statistics.db
+Data.db
+Index.db
diff --git a/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust_counter/mb-1-big-CompressionInfo.db b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust_counter/mb-1-big-CompressionInfo.db
new file mode 100644
index 0000000000..5a34d6e727
Binary files /dev/null and b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust_counter/mb-1-big-CompressionInfo.db differ
diff --git a/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust_counter/mb-1-big-Data.db b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust_counter/mb-1-big-Data.db
new file mode 100644
index 0000000000..55ad88d858
Binary files /dev/null and b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust_counter/mb-1-big-Data.db differ
diff --git a/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust_counter/mb-1-big-Digest.crc32 b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust_counter/mb-1-big-Digest.crc32
new file mode 100644
index 0000000000..86240b529a
--- /dev/null
+++ b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust_counter/mb-1-big-Digest.crc32
@@ -0,0 +1 @@
+346435755
\ No newline at end of file
diff --git a/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust_counter/mb-1-big-Filter.db b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust_counter/mb-1-big-Filter.db
new file mode 100644
index 0000000000..2e1d5d29ca
Binary files /dev/null and b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust_counter/mb-1-big-Filter.db differ
diff --git a/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust_counter/mb-1-big-Index.db b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust_counter/mb-1-big-Index.db
new file mode 100644
index 0000000000..d1a401b309
Binary files /dev/null and b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust_counter/mb-1-big-Index.db differ
diff --git a/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust_counter/mb-1-big-Statistics.db b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust_counter/mb-1-big-Statistics.db
new file mode 100644
index 0000000000..4f3f45a95c
Binary files /dev/null and b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust_counter/mb-1-big-Statistics.db differ
diff --git a/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust_counter/mb-1-big-Summary.db b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust_counter/mb-1-big-Summary.db
new file mode 100644
index 0000000000..9b24e0450c
Binary files /dev/null and b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust_counter/mb-1-big-Summary.db differ
diff --git a/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust_counter/mb-1-big-TOC.txt b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust_counter/mb-1-big-TOC.txt
new file mode 100644
index 0000000000..fe9581f576
--- /dev/null
+++ b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust_counter/mb-1-big-TOC.txt
@@ -0,0 +1,8 @@
+CompressionInfo.db
+Summary.db
+TOC.txt
+Digest.crc32
+Filter.db
+Statistics.db
+Data.db
+Index.db
diff --git a/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust_counter_compact/mb-1-big-CompressionInfo.db b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust_counter_compact/mb-1-big-CompressionInfo.db
new file mode 100644
index 0000000000..32fa731a8b
Binary files /dev/null and b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust_counter_compact/mb-1-big-CompressionInfo.db differ
diff --git a/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust_counter_compact/mb-1-big-Data.db b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust_counter_compact/mb-1-big-Data.db
new file mode 100644
index 0000000000..ca10874ffb
Binary files /dev/null and b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust_counter_compact/mb-1-big-Data.db differ
diff --git a/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust_counter_compact/mb-1-big-Digest.crc32 b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust_counter_compact/mb-1-big-Digest.crc32
new file mode 100644
index 0000000000..98f578404a
--- /dev/null
+++ b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust_counter_compact/mb-1-big-Digest.crc32
@@ -0,0 +1 @@
+3740016396
\ No newline at end of file
diff --git a/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust_counter_compact/mb-1-big-Filter.db b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust_counter_compact/mb-1-big-Filter.db
new file mode 100644
index 0000000000..2e1d5d29ca
Binary files /dev/null and b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust_counter_compact/mb-1-big-Filter.db differ
diff --git a/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust_counter_compact/mb-1-big-Index.db b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust_counter_compact/mb-1-big-Index.db
new file mode 100644
index 0000000000..3661d77233
Binary files /dev/null and b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust_counter_compact/mb-1-big-Index.db differ
diff --git a/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust_counter_compact/mb-1-big-Statistics.db b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust_counter_compact/mb-1-big-Statistics.db
new file mode 100644
index 0000000000..bb1e3fb721
Binary files /dev/null and b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust_counter_compact/mb-1-big-Statistics.db differ
diff --git a/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust_counter_compact/mb-1-big-Summary.db b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust_counter_compact/mb-1-big-Summary.db
new file mode 100644
index 0000000000..9b24e0450c
Binary files /dev/null and b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust_counter_compact/mb-1-big-Summary.db differ
diff --git a/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust_counter_compact/mb-1-big-TOC.txt b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust_counter_compact/mb-1-big-TOC.txt
new file mode 100644
index 0000000000..fe9581f576
--- /dev/null
+++ b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_clust_counter_compact/mb-1-big-TOC.txt
@@ -0,0 +1,8 @@
+CompressionInfo.db
+Summary.db
+TOC.txt
+Digest.crc32
+Filter.db
+Statistics.db
+Data.db
+Index.db
diff --git a/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple/mb-1-big-CompressionInfo.db b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple/mb-1-big-CompressionInfo.db
new file mode 100644
index 0000000000..288663f2fb
Binary files /dev/null and b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple/mb-1-big-CompressionInfo.db differ
diff --git a/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple/mb-1-big-Data.db b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple/mb-1-big-Data.db
new file mode 100644
index 0000000000..6a2f28e9d8
Binary files /dev/null and b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple/mb-1-big-Data.db differ
diff --git a/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple/mb-1-big-Digest.crc32 b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple/mb-1-big-Digest.crc32
new file mode 100644
index 0000000000..fb255bdf97
--- /dev/null
+++ b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple/mb-1-big-Digest.crc32
@@ -0,0 +1 @@
+655951031
\ No newline at end of file
diff --git a/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple/mb-1-big-Filter.db b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple/mb-1-big-Filter.db
new file mode 100644
index 0000000000..2e1d5d29ca
Binary files /dev/null and b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple/mb-1-big-Filter.db differ
diff --git a/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple/mb-1-big-Index.db b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple/mb-1-big-Index.db
new file mode 100644
index 0000000000..b3094bffba
Binary files /dev/null and b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple/mb-1-big-Index.db differ
diff --git a/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple/mb-1-big-Statistics.db b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple/mb-1-big-Statistics.db
new file mode 100644
index 0000000000..55dcdce665
Binary files /dev/null and b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple/mb-1-big-Statistics.db differ
diff --git a/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple/mb-1-big-Summary.db b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple/mb-1-big-Summary.db
new file mode 100644
index 0000000000..9b24e0450c
Binary files /dev/null and b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple/mb-1-big-Summary.db differ
diff --git a/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple/mb-1-big-TOC.txt b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple/mb-1-big-TOC.txt
new file mode 100644
index 0000000000..fe9581f576
--- /dev/null
+++ b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple/mb-1-big-TOC.txt
@@ -0,0 +1,8 @@
+CompressionInfo.db
+Summary.db
+TOC.txt
+Digest.crc32
+Filter.db
+Statistics.db
+Data.db
+Index.db
diff --git a/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple_compact/mb-1-big-CompressionInfo.db b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple_compact/mb-1-big-CompressionInfo.db
new file mode 100644
index 0000000000..adb7fc4579
Binary files /dev/null and b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple_compact/mb-1-big-CompressionInfo.db differ
diff --git a/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple_compact/mb-1-big-Data.db b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple_compact/mb-1-big-Data.db
new file mode 100644
index 0000000000..5cd0481040
Binary files /dev/null and b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple_compact/mb-1-big-Data.db differ
diff --git a/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple_compact/mb-1-big-Digest.crc32 b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple_compact/mb-1-big-Digest.crc32
new file mode 100644
index 0000000000..7d2bdbea85
--- /dev/null
+++ b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple_compact/mb-1-big-Digest.crc32
@@ -0,0 +1 @@
+3883019031
\ No newline at end of file
diff --git a/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple_compact/mb-1-big-Filter.db b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple_compact/mb-1-big-Filter.db
new file mode 100644
index 0000000000..2e1d5d29ca
Binary files /dev/null and b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple_compact/mb-1-big-Filter.db differ
diff --git a/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple_compact/mb-1-big-Index.db b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple_compact/mb-1-big-Index.db
new file mode 100644
index 0000000000..56f29df1cb
Binary files /dev/null and b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple_compact/mb-1-big-Index.db differ
diff --git a/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple_compact/mb-1-big-Statistics.db b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple_compact/mb-1-big-Statistics.db
new file mode 100644
index 0000000000..dff24fe7c6
Binary files /dev/null and b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple_compact/mb-1-big-Statistics.db differ
diff --git a/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple_compact/mb-1-big-Summary.db b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple_compact/mb-1-big-Summary.db
new file mode 100644
index 0000000000..9b24e0450c
Binary files /dev/null and b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple_compact/mb-1-big-Summary.db differ
diff --git a/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple_compact/mb-1-big-TOC.txt b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple_compact/mb-1-big-TOC.txt
new file mode 100644
index 0000000000..fe9581f576
--- /dev/null
+++ b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple_compact/mb-1-big-TOC.txt
@@ -0,0 +1,8 @@
+CompressionInfo.db
+Summary.db
+TOC.txt
+Digest.crc32
+Filter.db
+Statistics.db
+Data.db
+Index.db
diff --git a/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple_counter/mb-1-big-CompressionInfo.db b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple_counter/mb-1-big-CompressionInfo.db
new file mode 100644
index 0000000000..19d25c950f
Binary files /dev/null and b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple_counter/mb-1-big-CompressionInfo.db differ
diff --git a/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple_counter/mb-1-big-Data.db b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple_counter/mb-1-big-Data.db
new file mode 100644
index 0000000000..77a13948df
Binary files /dev/null and b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple_counter/mb-1-big-Data.db differ
diff --git a/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple_counter/mb-1-big-Digest.crc32 b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple_counter/mb-1-big-Digest.crc32
new file mode 100644
index 0000000000..172b695a88
--- /dev/null
+++ b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple_counter/mb-1-big-Digest.crc32
@@ -0,0 +1 @@
+2876949266
\ No newline at end of file
diff --git a/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple_counter/mb-1-big-Filter.db b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple_counter/mb-1-big-Filter.db
new file mode 100644
index 0000000000..2e1d5d29ca
Binary files /dev/null and b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple_counter/mb-1-big-Filter.db differ
diff --git a/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple_counter/mb-1-big-Index.db b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple_counter/mb-1-big-Index.db
new file mode 100644
index 0000000000..59e65cab85
Binary files /dev/null and b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple_counter/mb-1-big-Index.db differ
diff --git a/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple_counter/mb-1-big-Statistics.db b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple_counter/mb-1-big-Statistics.db
new file mode 100644
index 0000000000..4c6771550c
Binary files /dev/null and b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple_counter/mb-1-big-Statistics.db differ
diff --git a/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple_counter/mb-1-big-Summary.db b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple_counter/mb-1-big-Summary.db
new file mode 100644
index 0000000000..9b24e0450c
Binary files /dev/null and b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple_counter/mb-1-big-Summary.db differ
diff --git a/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple_counter/mb-1-big-TOC.txt b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple_counter/mb-1-big-TOC.txt
new file mode 100644
index 0000000000..fe9581f576
--- /dev/null
+++ b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple_counter/mb-1-big-TOC.txt
@@ -0,0 +1,8 @@
+CompressionInfo.db
+Summary.db
+TOC.txt
+Digest.crc32
+Filter.db
+Statistics.db
+Data.db
+Index.db
diff --git a/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple_counter_compact/mb-1-big-CompressionInfo.db b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple_counter_compact/mb-1-big-CompressionInfo.db
new file mode 100644
index 0000000000..56c95a8a36
Binary files /dev/null and b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple_counter_compact/mb-1-big-CompressionInfo.db differ
diff --git a/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple_counter_compact/mb-1-big-Data.db b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple_counter_compact/mb-1-big-Data.db
new file mode 100644
index 0000000000..00a7a3968e
Binary files /dev/null and b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple_counter_compact/mb-1-big-Data.db differ
diff --git a/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple_counter_compact/mb-1-big-Digest.crc32 b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple_counter_compact/mb-1-big-Digest.crc32
new file mode 100644
index 0000000000..f9f2fffbcb
--- /dev/null
+++ b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple_counter_compact/mb-1-big-Digest.crc32
@@ -0,0 +1 @@
+1214766167
\ No newline at end of file
diff --git a/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple_counter_compact/mb-1-big-Filter.db b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple_counter_compact/mb-1-big-Filter.db
new file mode 100644
index 0000000000..2e1d5d29ca
Binary files /dev/null and b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple_counter_compact/mb-1-big-Filter.db differ
diff --git a/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple_counter_compact/mb-1-big-Index.db b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple_counter_compact/mb-1-big-Index.db
new file mode 100644
index 0000000000..d094f73e21
Binary files /dev/null and b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple_counter_compact/mb-1-big-Index.db differ
diff --git a/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple_counter_compact/mb-1-big-Statistics.db b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple_counter_compact/mb-1-big-Statistics.db
new file mode 100644
index 0000000000..33c33f201e
Binary files /dev/null and b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple_counter_compact/mb-1-big-Statistics.db differ
diff --git a/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple_counter_compact/mb-1-big-Summary.db b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple_counter_compact/mb-1-big-Summary.db
new file mode 100644
index 0000000000..9b24e0450c
Binary files /dev/null and b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple_counter_compact/mb-1-big-Summary.db differ
diff --git a/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple_counter_compact/mb-1-big-TOC.txt b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple_counter_compact/mb-1-big-TOC.txt
new file mode 100644
index 0000000000..fe9581f576
--- /dev/null
+++ b/test/data/legacy-sstables/mb/legacy_tables/legacy_mb_simple_counter_compact/mb-1-big-TOC.txt
@@ -0,0 +1,8 @@
+CompressionInfo.db
+Summary.db
+TOC.txt
+Digest.crc32
+Filter.db
+Statistics.db
+Data.db
+Index.db
diff --git a/test/long/org/apache/cassandra/db/commitlog/CommitLogStressTest.java b/test/long/org/apache/cassandra/db/commitlog/CommitLogStressTest.java
index be3abb494d..31dea3e67f 100644
--- a/test/long/org/apache/cassandra/db/commitlog/CommitLogStressTest.java
+++ b/test/long/org/apache/cassandra/db/commitlog/CommitLogStressTest.java
@@ -452,7 +452,7 @@ public class CommitLogStressTest
         int cells = 0;
 
         @Override
-        void replayMutation(byte[] inputBuffer, int size, final long entryLocation, final CommitLogDescriptor desc)
+        void replayMutation(byte[] inputBuffer, int size, final int entryLocation, final CommitLogDescriptor desc)
         {
             if (desc.id < discardedPos.segment)
             {
diff --git a/test/unit/org/apache/cassandra/db/commitlog/CommitLogTestReplayer.java b/test/unit/org/apache/cassandra/db/commitlog/CommitLogTestReplayer.java
index fea83c1ce5..e690785682 100644
--- a/test/unit/org/apache/cassandra/db/commitlog/CommitLogTestReplayer.java
+++ b/test/unit/org/apache/cassandra/db/commitlog/CommitLogTestReplayer.java
@@ -59,7 +59,7 @@ public class CommitLogTestReplayer extends CommitLogReplayer
     }
 
     @Override
-    void replayMutation(byte[] inputBuffer, int size, final long entryLocation, final CommitLogDescriptor desc)
+    void replayMutation(byte[] inputBuffer, int size, final int entryLocation, final CommitLogDescriptor desc)
     {
         RebufferingInputStream bufIn = new DataInputBuffer(inputBuffer, 0, size);
         Mutation mutation;
diff --git a/test/unit/org/apache/cassandra/db/lifecycle/TrackerTest.java b/test/unit/org/apache/cassandra/db/lifecycle/TrackerTest.java
index 7b9b19c1f1..b8de711367 100644
--- a/test/unit/org/apache/cassandra/db/lifecycle/TrackerTest.java
+++ b/test/unit/org/apache/cassandra/db/lifecycle/TrackerTest.java
@@ -38,6 +38,7 @@ import org.apache.cassandra.MockSchema;
 import org.apache.cassandra.config.DatabaseDescriptor;
 import org.apache.cassandra.db.ColumnFamilyStore;
 import org.apache.cassandra.db.Memtable;
+import org.apache.cassandra.db.commitlog.CommitLog;
 import org.apache.cassandra.db.commitlog.ReplayPosition;
 import org.apache.cassandra.db.compaction.OperationType;
 import org.apache.cassandra.io.sstable.format.SSTableReader;
@@ -265,15 +266,15 @@ public class TrackerTest
         Tracker tracker = cfs.getTracker();
         tracker.subscribe(listener);
 
-        Memtable prev1 = tracker.switchMemtable(true);
+        Memtable prev1 = tracker.switchMemtable(true, new Memtable(new AtomicReference<>(CommitLog.instance.getContext()), cfs));
         OpOrder.Group write1 = cfs.keyspace.writeOrder.getCurrent();
         OpOrder.Barrier barrier1 = cfs.keyspace.writeOrder.newBarrier();
-        prev1.setDiscarding(barrier1, new AtomicReference<ReplayPosition>());
+        prev1.setDiscarding(barrier1, new AtomicReference<>(CommitLog.instance.getContext()));
         barrier1.issue();
-        Memtable prev2 = tracker.switchMemtable(false);
+        Memtable prev2 = tracker.switchMemtable(false, new Memtable(new AtomicReference<>(CommitLog.instance.getContext()), cfs));
         OpOrder.Group write2 = cfs.keyspace.writeOrder.getCurrent();
         OpOrder.Barrier barrier2 = cfs.keyspace.writeOrder.newBarrier();
-        prev2.setDiscarding(barrier2, new AtomicReference<ReplayPosition>());
+        prev2.setDiscarding(barrier2, new AtomicReference<>(CommitLog.instance.getContext()));
         barrier2.issue();
         Memtable cur = tracker.getView().getCurrentMemtable();
         OpOrder.Group writecur = cfs.keyspace.writeOrder.getCurrent();
@@ -292,13 +293,16 @@ public class TrackerTest
         Assert.assertTrue(tracker.getView().flushingMemtables.contains(prev1));
         Assert.assertEquals(2, tracker.getView().flushingMemtables.size());
 
-        tracker.replaceFlushed(prev1, null);
+        tracker.replaceFlushed(prev1, Collections.emptyList());
         Assert.assertEquals(1, tracker.getView().flushingMemtables.size());
         Assert.assertTrue(tracker.getView().flushingMemtables.contains(prev2));
 
         SSTableReader reader = MockSchema.sstable(0, 10, false, cfs);
         tracker.replaceFlushed(prev2, Collections.singleton(reader));
         Assert.assertEquals(1, tracker.getView().sstables.size());
+        Assert.assertEquals(1, tracker.getView().premature.size());
+        tracker.permitCompactionOfFlushed(singleton(reader));
+        Assert.assertEquals(0, tracker.getView().premature.size());
         Assert.assertEquals(1, listener.received.size());
         Assert.assertEquals(singleton(reader), ((SSTableAddedNotification) listener.received.get(0)).added);
         listener.received.clear();
@@ -310,18 +314,17 @@ public class TrackerTest
         tracker = cfs.getTracker();
         listener = new MockListener(false);
         tracker.subscribe(listener);
-        prev1 = tracker.switchMemtable(false);
+        prev1 = tracker.switchMemtable(false, new Memtable(new AtomicReference<>(CommitLog.instance.getContext()), cfs));
         tracker.markFlushing(prev1);
         reader = MockSchema.sstable(0, 10, true, cfs);
         cfs.invalidate(false);
         tracker.replaceFlushed(prev1, Collections.singleton(reader));
+        tracker.permitCompactionOfFlushed(Collections.singleton(reader));
         Assert.assertEquals(0, tracker.getView().sstables.size());
         Assert.assertEquals(0, tracker.getView().flushingMemtables.size());
         Assert.assertEquals(0, cfs.metric.liveDiskSpaceUsed.getCount());
-        Assert.assertEquals(3, listener.received.size());
-        Assert.assertEquals(singleton(reader), ((SSTableAddedNotification) listener.received.get(0)).added);
-        Assert.assertTrue(listener.received.get(1) instanceof  SSTableDeletingNotification);
-        Assert.assertEquals(1, ((SSTableListChangedNotification) listener.received.get(2)).removed.size());
+        Assert.assertEquals(reader, (((SSTableDeletingNotification) listener.received.get(0)).deleting));
+        Assert.assertEquals(1, ((SSTableListChangedNotification) listener.received.get(1)).removed.size());
         DatabaseDescriptor.setIncrementalBackupsEnabled(backups);
     }
 
diff --git a/test/unit/org/apache/cassandra/db/lifecycle/ViewTest.java b/test/unit/org/apache/cassandra/db/lifecycle/ViewTest.java
index 523c203c91..8a5e00e1bc 100644
--- a/test/unit/org/apache/cassandra/db/lifecycle/ViewTest.java
+++ b/test/unit/org/apache/cassandra/db/lifecycle/ViewTest.java
@@ -212,6 +212,6 @@ public class ViewTest
         for (int i = 0 ; i < sstableCount ; i++)
             sstables.add(MockSchema.sstable(i, cfs));
         return new View(ImmutableList.copyOf(memtables), Collections.<Memtable>emptyList(), Helpers.identityMap(sstables),
-                        Collections.<SSTableReader, SSTableReader>emptyMap(), SSTableIntervalTree.build(sstables));
+                        Collections.<SSTableReader, SSTableReader>emptyMap(), Collections.<SSTableReader>emptySet(), SSTableIntervalTree.build(sstables));
     }
 }
diff --git a/test/unit/org/apache/cassandra/io/compress/CompressedRandomAccessReaderTest.java b/test/unit/org/apache/cassandra/io/compress/CompressedRandomAccessReaderTest.java
index 74b5c7474b..802d9c8b2b 100644
--- a/test/unit/org/apache/cassandra/io/compress/CompressedRandomAccessReaderTest.java
+++ b/test/unit/org/apache/cassandra/io/compress/CompressedRandomAccessReaderTest.java
@@ -120,7 +120,7 @@ public class CompressedRandomAccessReaderTest
         final String filename = f.getAbsolutePath();
         try(ChannelProxy channel = new ChannelProxy(f))
         {
-            MetadataCollector sstableMetadataCollector = new MetadataCollector(new ClusteringComparator(BytesType.instance)).replayPosition(null);
+            MetadataCollector sstableMetadataCollector = new MetadataCollector(new ClusteringComparator(BytesType.instance));
             try(SequentialWriter writer = compressed
                 ? new CompressedSequentialWriter(f, filename + ".metadata", CompressionParams.snappy(), sstableMetadataCollector)
                 : SequentialWriter.open(f))
@@ -190,7 +190,7 @@ public class CompressedRandomAccessReaderTest
         assertTrue(file.createNewFile());
         assertTrue(metadata.createNewFile());
 
-        MetadataCollector sstableMetadataCollector = new MetadataCollector(new ClusteringComparator(BytesType.instance)).replayPosition(null);
+        MetadataCollector sstableMetadataCollector = new MetadataCollector(new ClusteringComparator(BytesType.instance));
         try (SequentialWriter writer = new CompressedSequentialWriter(file, metadata.getPath(), CompressionParams.snappy(), sstableMetadataCollector))
         {
             writer.write(CONTENT.getBytes());
diff --git a/test/unit/org/apache/cassandra/io/compress/CompressedSequentialWriterTest.java b/test/unit/org/apache/cassandra/io/compress/CompressedSequentialWriterTest.java
index 9b09f0b488..e045aadf2f 100644
--- a/test/unit/org/apache/cassandra/io/compress/CompressedSequentialWriterTest.java
+++ b/test/unit/org/apache/cassandra/io/compress/CompressedSequentialWriterTest.java
@@ -88,7 +88,7 @@ public class CompressedSequentialWriterTest extends SequentialWriterTest
 
         try
         {
-            MetadataCollector sstableMetadataCollector = new MetadataCollector(new ClusteringComparator(Arrays.<AbstractType<?>>asList(BytesType.instance))).replayPosition(null);
+            MetadataCollector sstableMetadataCollector = new MetadataCollector(new ClusteringComparator(Arrays.<AbstractType<?>>asList(BytesType.instance)));
 
             byte[] dataPre = new byte[bytesToTest];
             byte[] rawPost = new byte[bytesToTest];
diff --git a/test/unit/org/apache/cassandra/io/sstable/LegacySSTableTest.java b/test/unit/org/apache/cassandra/io/sstable/LegacySSTableTest.java
index 4b9a7692f6..62228e3ed7 100644
--- a/test/unit/org/apache/cassandra/io/sstable/LegacySSTableTest.java
+++ b/test/unit/org/apache/cassandra/io/sstable/LegacySSTableTest.java
@@ -71,7 +71,7 @@ public class LegacySSTableTest
      * See {@link #testGenerateSstables()} to generate sstables.
      * Take care on commit as you need to add the sstable files using {@code git add -f}
      */
-    public static final String[] legacyVersions = {"ma", "la", "ka", "jb"};
+    public static final String[] legacyVersions = {"mb", "ma", "la", "ka", "jb"};
 
     // 1200 chars
     static final String longString = "0123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789" +
diff --git a/test/unit/org/apache/cassandra/io/sstable/metadata/MetadataSerializerTest.java b/test/unit/org/apache/cassandra/io/sstable/metadata/MetadataSerializerTest.java
index 4c108824ce..93365ef0c4 100644
--- a/test/unit/org/apache/cassandra/io/sstable/metadata/MetadataSerializerTest.java
+++ b/test/unit/org/apache/cassandra/io/sstable/metadata/MetadataSerializerTest.java
@@ -19,6 +19,7 @@
 package org.apache.cassandra.io.sstable.metadata;
 
 import java.io.File;
+import java.io.FileNotFoundException;
 import java.io.FileOutputStream;
 import java.io.IOException;
 import java.util.Collections;
@@ -30,10 +31,12 @@ import org.junit.Test;
 import org.apache.cassandra.SchemaLoader;
 import org.apache.cassandra.config.CFMetaData;
 import org.apache.cassandra.db.SerializationHeader;
+import org.apache.cassandra.config.DatabaseDescriptor;
 import org.apache.cassandra.db.commitlog.ReplayPosition;
 import org.apache.cassandra.dht.RandomPartitioner;
 import org.apache.cassandra.io.sstable.Component;
 import org.apache.cassandra.io.sstable.Descriptor;
+import org.apache.cassandra.io.sstable.format.Version;
 import org.apache.cassandra.io.sstable.format.big.BigFormat;
 import org.apache.cassandra.io.util.BufferedDataOutputStreamPlus;
 import org.apache.cassandra.io.util.DataOutputStreamPlus;
@@ -46,24 +49,10 @@ public class MetadataSerializerTest
     @Test
     public void testSerialization() throws IOException
     {
-
-        CFMetaData cfm = SchemaLoader.standardCFMD("ks1", "cf1");
-
-        ReplayPosition rp = new ReplayPosition(11L, 12);
-
-        MetadataCollector collector = new MetadataCollector(cfm.comparator).replayPosition(rp);
-
-        String partitioner = RandomPartitioner.class.getCanonicalName();
-        double bfFpChance = 0.1;
-        Map<MetadataType, MetadataComponent> originalMetadata = collector.finalizeMetadata(partitioner, bfFpChance, 0, SerializationHeader.make(cfm, Collections.EMPTY_LIST));
+        Map<MetadataType, MetadataComponent> originalMetadata = constructMetadata();
 
         MetadataSerializer serializer = new MetadataSerializer();
-        // Serialize to tmp file
-        File statsFile = File.createTempFile(Component.STATS.name, null);
-        try (DataOutputStreamPlus out = new BufferedDataOutputStreamPlus(new FileOutputStream(statsFile)))
-        {
-            serializer.serialize(originalMetadata, out, BigFormat.latestVersion);
-        }
+        File statsFile = serialize(originalMetadata, serializer, BigFormat.latestVersion);
 
         Descriptor desc = new Descriptor( statsFile.getParentFile(), "", "", 0);
         try (RandomAccessReader in = RandomAccessReader.open(statsFile))
@@ -76,4 +65,72 @@ public class MetadataSerializerTest
             }
         }
     }
+
+    public File serialize(Map<MetadataType, MetadataComponent> metadata, MetadataSerializer serializer, Version version)
+            throws IOException, FileNotFoundException
+    {
+        // Serialize to tmp file
+        File statsFile = File.createTempFile(Component.STATS.name, null);
+        try (DataOutputStreamPlus out = new BufferedDataOutputStreamPlus(new FileOutputStream(statsFile)))
+        {
+            serializer.serialize(metadata, out, version);
+        }
+        return statsFile;
+    }
+
+    public Map<MetadataType, MetadataComponent> constructMetadata()
+    {
+        ReplayPosition club = new ReplayPosition(11L, 12);
+        ReplayPosition cllb = new ReplayPosition(9L, 12);
+
+        CFMetaData cfm = SchemaLoader.standardCFMD("ks1", "cf1");
+        MetadataCollector collector = new MetadataCollector(cfm.comparator)
+                                          .commitLogLowerBound(cllb)
+                                          .commitLogUpperBound(club);
+
+        String partitioner = RandomPartitioner.class.getCanonicalName();
+        double bfFpChance = 0.1;
+        Map<MetadataType, MetadataComponent> originalMetadata = collector.finalizeMetadata(partitioner, bfFpChance, 0, SerializationHeader.make(cfm, Collections.emptyList()));
+        return originalMetadata;
+    }
+
+    @Test
+    public void testLaReadLb() throws IOException
+    {
+        testOldReadsNew("la", "lb");
+    }
+
+    @Test
+    public void testMaReadMb() throws IOException
+    {
+        testOldReadsNew("ma", "mb");
+    }
+
+    public void testOldReadsNew(String oldV, String newV) throws IOException
+    {
+        Map<MetadataType, MetadataComponent> originalMetadata = constructMetadata();
+
+        MetadataSerializer serializer = new MetadataSerializer();
+        // Write metadata in two minor formats.
+        File statsFileLb = serialize(originalMetadata, serializer, BigFormat.instance.getVersion(newV));
+        File statsFileLa = serialize(originalMetadata, serializer, BigFormat.instance.getVersion(oldV));
+        // Reading both as earlier version should yield identical results.
+        Descriptor desc = new Descriptor(oldV, statsFileLb.getParentFile(), "", "", 0, DatabaseDescriptor.getSSTableFormat());
+        try (RandomAccessReader inLb = RandomAccessReader.open(statsFileLb);
+             RandomAccessReader inLa = RandomAccessReader.open(statsFileLa))
+        {
+            Map<MetadataType, MetadataComponent> deserializedLb = serializer.deserialize(desc, inLb, EnumSet.allOf(MetadataType.class));
+            Map<MetadataType, MetadataComponent> deserializedLa = serializer.deserialize(desc, inLa, EnumSet.allOf(MetadataType.class));
+
+            for (MetadataType type : MetadataType.values())
+            {
+                assertEquals(deserializedLa.get(type), deserializedLb.get(type));
+                if (!originalMetadata.get(type).equals(deserializedLb.get(type)))
+                {
+                    // Currently only STATS can be different. Change if no longer the case
+                    assertEquals(MetadataType.STATS, type);
+                }
+            }
+        }
+    }
 }
diff --git a/test/unit/org/apache/cassandra/io/util/MmappedRegionsTest.java b/test/unit/org/apache/cassandra/io/util/MmappedRegionsTest.java
index 9df3fed468..7cf7bd3283 100644
--- a/test/unit/org/apache/cassandra/io/util/MmappedRegionsTest.java
+++ b/test/unit/org/apache/cassandra/io/util/MmappedRegionsTest.java
@@ -297,8 +297,7 @@ public class MmappedRegionsTest
         File cf = File.createTempFile(f.getName() + ".metadata", "1");
         cf.deleteOnExit();
 
-        MetadataCollector sstableMetadataCollector = new MetadataCollector(new ClusteringComparator(BytesType.instance))
-                                                     .replayPosition(null);
+        MetadataCollector sstableMetadataCollector = new MetadataCollector(new ClusteringComparator(BytesType.instance));
         try(SequentialWriter writer = new CompressedSequentialWriter(f,
                                                                      cf.getAbsolutePath(),
                                                                      CompressionParams.snappy(),