Replaces the fixed-retry commit loop with deadline-based exponential
backoff for long running CMS commit operations (cms_commit_timeout=1h, 5s-60s jitter)
to allow heavily contended CMS nodes time to commit transforms.
Patch by Jon Meredith and Sam Tunnicliffe; reviewed by Jon Meredith and
Sam Tunnicliffe for CASSANDRA-21453
Co-authored-by: Sam Tunnicliffe <samt@apache.org>
- Introduced LocalCommand marker interface to identify commands that execute purely locally without a JMX connection.
- Updated History command to implement LocalCommand.
- Updated CassandraCliHelpLayout to check for LocalCommand instead of calling execution-flow methods, safely suppressing JMX options for offline commands.
patch by Arvind Kandpal; reviewed by Stefan Miklosovic, Maxim Muzafarov for CASSANDRA-20876
* Insert the actual PreInitialize entry in the distribute metadata log
table using a callback after the log is bootstrapped.
* Remove the implicit insert on subsequent commit, i.e. of the Initialize entry
* Enables the full specifics of PreInit to be encoded in the serialized form,
removing the special casing for the first CMS member and other nodes
* Correctly invalidate cached KeyspaceMetadata when in a pre-initialized state
* Update Host ids in the system.peers_v2 table directly following CMS initialization
* Initialise gossip/local host id after CMS initialization completes
* Clean up CMS initialization errors which occur after the PreInitialize stage
Co-authored-by: Alex Petrov <oleksandr.petrov@gmail.com>
Co-authored-by: Marcus Eriksson <marcuse@apache.org>
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
The implementation of this CEP adds the ability to plug-in custom compressors providers
which might delegate the de/compression to a specialized hardware. An operator does not
need to change any schema definition, the mere implementation of a compressor provider
put on a class path and its related configuration in cassandra.yaml will transparently
start to use appropriate compressor, e.g. backed by a specialized hardware.
patch by Shylaja Kokoori; reviewed by Joey Lynch, Stefan Miklosovic for CASSANDRA-20975
Co-authored-by: Stefan Miklosovic <smiklosovic@apache.org>
When BTreeRow.merge reconciles an update into a row whose existing deletion
shadows the update's cells, it filtered the update (incoming) side of the merge
with Reconciler.retain, which records the removal via
PostReconciliationFunction.delete. On the memtable write path that subtracts the
shadowed cells' on-heap size from the allocator's ownership even though that
incoming data was never allocated to the memtable. Under overwrite/delete churn
that re-applies cells already covered by a newer row/partition deletion (e.g.
repair re-streaming), the allocator's "owns" counter drifts negative and the next
flush trips "AssertionError: Negative released" in MemtablePool$SubPool.released
via MemtableAllocator$SubAllocator.releaseAll during discard.
Filter the update (incoming) side with a non-recording variant,
Reconciler.removeShadowed, and keep retain() for the existing side,
whose data the memtable already owns. The filtered result is identical; only the
erroneous accounting notification is dropped. This mirrors the already-correct
complex-column path in ColumnData.merge.
patch by Stefan Miklosovic; reviewed by Dmitry Konstantinov for CASSANDRA-21469
Assisted-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit fixes several issues found using the Cassandra
edge case explorer skill for the BTI feature.
patch by Francisco Guerrero; reviewed by Aleksey Yeschenko for CASSANDRA-21353
Stefan Miklosovic