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https://issues.apache.org/jira/browse/CASSANDRA-3484?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dan Hendry updated CASSANDRA-3484:
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Attachment: 3484.txt
Patch to only reschedule another compaction check when the active check
resulted in a task being executed
> Bizarre Compaction Manager Behaviour
> ------------------------------------
>
> Key: CASSANDRA-3484
> URL: https://issues.apache.org/jira/browse/CASSANDRA-3484
> Project: Cassandra
> Issue Type: Bug
> Components: Core
> Affects Versions: 1.0.2
> Environment: RHEL 6
> java version "1.6.0_26"
> 6 node cluster (5 nodes 0.8.6, 1 node 1.0.2 minus CASSANDRA-2503)
> Reporter: Dan Hendry
> Attachments: 3484.txt, compaction.png
>
>
> It seems the CompactionManager has gotten itself into a bad state. My 1.0.2
> node has been up for 20 hours now - checking via JMX, the compaction manager
> is reporting that it has completed 14,797,412,000 tasks. Yep, thats right 14
> billion tasks and increasing at a rate of roughly 208,400/second.
> I should point out that I am currently running a major compaction on the
> node. My theory is that this problem was introduced by CASSANDRA-3363. It
> looks like SizeTieredCompactionStrategy.getBackgroundTasks() returns a set of
> task without consideration for any in-progress compactions. Compactions are
> only kicked off if task.markSSTablesForCompaction() returns true
> (CompactionManager line 127) but the task resubmission is based only on the
> task list not being empty (CompactionManager line 141). Should the logic not
> be to only reschedule if a task has actually been executed?
> I am just waiting now for the major compaction to finish to see if the
> problem goes away as would be suggested by my theory.
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