Gary Ogasawara created CASSANDRA-11307:
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Summary: Inappropriate WARN log message for commit log sync delay
when using commitlog_sync: batch
Key: CASSANDRA-11307
URL: https://issues.apache.org/jira/browse/CASSANDRA-11307
Project: Cassandra
Issue Type: Bug
Components: Core
Environment: Linux
Reporter: Gary Ogasawara
Priority: Minor
In v2.1.11 when using configuration
commitlog_sync: batch
commitlog_sync_batch_window_in_ms: 2
will frequently get this WARN log though there is not a real problem.
WARN [COMMIT-LOG-WRITER] 2016-03-03 00:40:11,646
AbstractCommitLogService.java:105 - Out of 142412 commit log syncs over the
past 300s with average duration of 0.00ms, 35 have exceeded the configured
commit interval by an average of 3.66ms
WARN [COMMIT-LOG-WRITER] 2016-03-03 00:45:11,755
AbstractCommitLogService.java:105 - Out of 104605 commit log syncs over the
past 300s with average duration of 1.74ms, 18314 have exceeded the configured
commit interval by an average of 6.33ms
Looks like BatchCommitLogService sets AbstractCommitLogService()
pollIntervalMillis to the configured commitlog_sync_batch_window_in_ms. Since
CASSANDRA-9504, this is by default set to 2 which causes this WARN message to
be triggered unnecessarily.
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