Adds an opt-in O_DIRECT write path for background SSTable producers,
bypassing the OS page cache for data that is unlikely to be re-read
soon after being written. Memtable flushes remain buffered.
Enabled via two new YAML knobs:
- background_write_disk_access_mode: standard (default) | direct
- direct_write_buffer_size: 1MiB (default; aligned up to FS block
size, auto-grown to fit a worst-case compressed chunk)
The path is gated by config, table compression being enabled, and an
OperationType allowlist in DataComponent. The allowlist is exhaustive
over OperationType: any new value left unclassified fails static
initialization.
Operations on the DIO path: COMPACTION, MAJOR_COMPACTION,
TOMBSTONE_COMPACTION, ANTICOMPACTION, GARBAGE_COLLECT, CLEANUP,
UPGRADE_SSTABLES, WRITE, STREAM (chunked receiver only), RELOCATE,
UNKNOWN (offline sstablesplit).
Operations off the DIO path:
- FLUSH (policy: just-flushed data is hot, keep in page cache)
- SCRUB (correctness: tryAppend needs mark/resetAndTruncate)
- Zero-Copy Streaming (bypasses DataComponent.buildWriter)
- Uncompressed writers (only CompressedSequentialWriter has a DIO
subclass in this change)
StartupChecks fails fast if 'direct' is requested on a platform/FS
that does not support O_DIRECT.
patch by Sam Lightfoot; reviewed by Ariel Weisberg, Dmitry Konstantinov for CASSANDRA-21134
add SAN to certificates used by tests
add TLS_ECDHE_* to ciphers list in SSTableLoaderEncryptionOptionsTest
Patch by Dmitry Konstantinov; reviewed by Michael Semb Wever for CASSANDRA-21441
- TransactionStatement token aware routing
- Mitigate convoy effect:
- ExecuteTxnBacklog v1 can execute single key transaction backlogs and disseminate the result
- Direct local execution possible for single key transactions
- Use shardAppliedBefore instead of gcBefore to cleanup CFK faster
Also Improve:
- Introduce distributed tracing
- Combine RejectBefore and MaxConflicts
- Self-addressed messages are delivered directly
- Disable AccordSyncPropagator by default, as incompatible with large clusters
- FastPathStrategy.SIMPLE should not modify fast path contents; FastPathStrategy.UP introduced to adopt this behaviour
- Configurable queue prioritisation
- ProtocolModifiers mostly final
- Remove unnecessary condition check when serializing TxnUpdate
Also Fix:
- SequentialExecutor ownership bug
- BTree.XUpdater.reset()
patch by Benedict; reviewed by Alex Petrov and Ariel Weisberg for CASSANDRA-21361
- Clean Shutdown/Restart
- Rebootstrap to allow nodes to rejoin consensus if they are out of sync, or did not shutdown cleanly
Improve:
- Improve efficiency of BTreeReducingRangeMap
- DurableBefore backed by BTreeReducingRangeMap
- Soft reject new transactions when a replica has a backlog of work
- system_accord_debug.command_store_ops supports starting journal replay
Fix:
- Ensure SequentialExecutor.owner is unset only by the owner
- Detect and avoid taking two AccordExecutor locks simultaneously
- MaxConflicts serializer
- tryToExecuteListening after replay, to handle invalidated dependencies
- TxnNamedRead does not close a RowIterator, leading to native memory leaks
- GetLatestDepsNack serialization
- journal.readLast() did not read last
- DefaultRemoteListeners not correctly synchronised
- RangeTxnScanner cancellation assumes was already started
- Start cfk compaction before replay
- txn_graph should avoid visiting parents twice (possible if two different dependency chains connecting them in the graph)
- Topology.cloneEquivalentWithEpoch should also share nodeLookup and ranges, especially to accelerate computeWaitForEpoch/computeScope
- Do not invoke slowReplicaDelay or slowCoordinatorDelay during restore
- Do not fail if slowReplicaDelay or slowCoordinatorDelay are invoked without knowing the transaction
patch by Benedict; reviewed by Alex Petrov and Ariel Weisberg for CASSANDRA-21355
With negotiated authentication (CEP-50), nodes may be configured with multiple authenticators. Prior to this change,
a number of areas in the code assumed that there was a single configured authenticator and contained logic that
switched depending on the authenticator type. This logic won't work when multiple authenticators can be configured.
This change eliminates most calls to DataDescriptor.getAuthenticator(), by enabling individual authenticators to
declare the role attributes they support, requiring callers to specify the type of authenticator they're looking
for, and directly returning whether the node can enforce authn or not rather than inferring it by the presence of
an authenticator.
Testing done: Unit tests for auth and config packages; d-tests for auth-related functionality (e.g. ColumnMasks).
patch by Joel Shepherd; reviewed by Stefan Miklosovic, Andy Tolbert for CASSANDRA-20834
The SimpleProgressLog had a number of problems:
1. It polled for progress with no attempt to determine whether progress could realistically be made, so:
- as the number of pending transactions grew, the proportion of useful work dropped (as many would be unable to make progress without earlier transactions completing)
- each transaction in the chain could recover only on average 1/2 poll interval behind the last transaction to complete
2. It requested full transaction state from every replica on each attempt
3. It maintained a lot of in-memory state
4. Polling happened en-masse, allowing for little per-transaction control
We also separately maintained fairly expensive per-command listener state that negatively affected our command loading and caching.
The new DefaultProgressLog makes use of several new features: LocalListeners, RemoteListeners, Timers and Await messages.
- LocalListeners provide a memory-efficient collection for managing each CommandStore<E2><80><99>s transaction listeners, with dedicated record keeping for inter-transaction relationships.
- RemoteListeners provide a mechanism for request/response pairs that may be separated by longer than the normal Cassandra message timeout, and require minimal state on sender and recipient. This permits replicas to cheaply update their local state machine as soon as distributed information becomes available.
The DefaultProgressLog tracks each transaction with separate timers to handle per-transaction scheduling, backoff etc, and a succinct state machine. To reduce overhead correspondence is preferentially limited to a handful of replicas, and limited to the home shard where appropriate.
patch by Benedict; reviewed by Ariel Weisberg for CASSANDRA-19870
patch by Zhongxiang Zheng; reviewed by Stefan Miklosovic, Maulin Vasavada, Cheng Wang, Jordan West for CASSANDRA-11695
Co-authored-by: Stefan Miklosovic <smiklosovic@apache.org>
Co-authored-by: Sam Tunnicliffe <samt@apache.org>
Both CASSANDRA-18120 and CASSANDRA-19946 updated cassandra_latest.yaml but not the corresponding test configs
patch by Mick Semb Wever; reviewed by Brandon Williams, Tiago L. Alves for CASSANDRA-20002
This patch adds a new configuration file, cassandra_latest.yaml, which changes
some of the settings to use new features we usually recommend to users,
including:
- Big Trie-Indexed SSTables
- Trie memtables
- Unified Compaction Strategy
- Storage Attached Index
- Off-heap objects memtables
- Direct-write commit log
- No storage compatibility
These changes are applied in new test targets for unit, in-jvm and python dtests that are
run pre-commit. When changes are made to the new config file, python dtest will use it
directly, but unit and in-jvm dtests require updates, respectively, to latest_diff.yaml
and InstanceConfig.java.
patch by Branimir Lambov; reviewed by Berenguer Blasi for CASSANDRA-18753
patch by Claude Warren; reviewed by Stefan Miklosovic, Jacek Lewandowski, Michael Semb Wever for CASSANDRA-16565
Co-authored-by: Stefan Miklosovic <smiklosovic@apache.org>
Patch by Amit Pawar and Jacek Lewandowski; reviewed by Branimir Lambov and Maxwell Guo for CASSANDRA-18464
Co-authored-by: Amit Pawar <Amit.Pawar@amd.com>
Co-authored-by: Jacek Lewandowski <lewandowski.jacek@gmail.com>
An overview of the core components can be found in the included
TransactionalClusterMetadata.md
patch by Alex Petrov, Marcus Eriksson and Sam Tunnicliffe; reviewed by
Alex Petrov, Marcus Eriksson and Sam Tunnicliffe for CASSANDRA-18330
Co-authored-by: Marcus Eriksson <marcuse@apache.org>
Co-authored-by: Alex Petrov <oleksandr.petrov@gmail.com>
Co-authored-by: Sam Tunnicliffe <samt@apache.org>
samlightfoot