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Posted to commits@cassandra.apache.org by "Benedict (JIRA)" <ji...@apache.org> on 2014/12/30 15:51:13 UTC
[jira] [Resolved] (CASSANDRA-8409) Node generating a huge number of
tiny sstable_activity flushes
[ https://issues.apache.org/jira/browse/CASSANDRA-8409?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Benedict resolved CASSANDRA-8409.
---------------------------------
Resolution: Duplicate
> Node generating a huge number of tiny sstable_activity flushes
> --------------------------------------------------------------
>
> Key: CASSANDRA-8409
> URL: https://issues.apache.org/jira/browse/CASSANDRA-8409
> Project: Cassandra
> Issue Type: Bug
> Components: Core
> Environment: Cassandra 2.1.0, Oracle JDK 1.8.0_25, Ubuntu 12.04
> Reporter: Fred Wulff
> Fix For: 2.1.3
>
> Attachments: system-sstable_activity-ka-67802-Data.db
>
>
> On one of my nodes, I’m seeing hundreds per second of “INFO 21:28:05 Enqueuing flush of sstable_activity: 0 (0%) on-heap, 33 (0%) off-heap”. tpstats shows a steadily climbing # of pending MemtableFlushWriter/MemtablePostFlush until the node OOMs. When the flushes actually happen the sstable written is invariably 121 bytes. I’m writing pretty aggressively to one of my user tables (sev.mdb_group_pit), but that table's flushing behavior seems reasonable.
> tpstats:
> {quote}
> frew@hostname:~/s_dist/apache-cassandra-2.1.0$ bin/nodetool -h hostname tpstats
> Pool Name Active Pending Completed Blocked All time blocked
> MutationStage 128 4429 36810 0 0
> ReadStage 0 0 1205 0 0
> RequestResponseStage 0 0 24910 0 0
> ReadRepairStage 0 0 26 0 0
> CounterMutationStage 0 0 0 0 0
> MiscStage 0 0 0 0 0
> HintedHandoff 2 2 9 0 0
> GossipStage 0 0 5157 0 0
> CacheCleanupExecutor 0 0 0 0 0
> InternalResponseStage 0 0 0 0 0
> CommitLogArchiver 0 0 0 0 0
> CompactionExecutor 4 28 429 0 0
> ValidationExecutor 0 0 0 0 0
> MigrationStage 0 0 0 0 0
> AntiEntropyStage 0 0 0 0 0
> PendingRangeCalculator 0 0 11 0 0
> MemtableFlushWriter 8 38644 8987 0 0
> MemtablePostFlush 1 38940 8735 0 0
> MemtableReclaimMemory 0 0 8987 0 0
> Message type Dropped
> READ 0
> RANGE_SLICE 0
> _TRACE 0
> MUTATION 10457
> COUNTER_MUTATION 0
> BINARY 0
> REQUEST_RESPONSE 0
> PAGED_RANGE 0
> READ_REPAIR 208
> {quote}
> I've attached one of the produced sstables.
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