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https://issues.apache.org/jira/browse/CASSANDRA-8862?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jonathan Ellis updated CASSANDRA-8862:
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Fix Version/s: 2.1.4
> Commit log pending tasks incremented during getPendingTasks
> -----------------------------------------------------------
>
> Key: CASSANDRA-8862
> URL: https://issues.apache.org/jira/browse/CASSANDRA-8862
> Project: Cassandra
> Issue Type: Bug
> Reporter: Michael Swiecicki
> Priority: Minor
> Fix For: 2.1.4
>
>
> After upgrading from Cassandra 2.0.8 to 2.1.2 our monitoring based on JMX
> metrics shows increasing number of commit log pending tasks. From what we
> found out, this value is now incremented every time it is fetched.
> It is easy to reproduce using tool like JConsole by refreshing value of
> PendingTasks attribute.
> Quick look at the code shows that this behavior was probably introduced in
> 2.1 with CASSANDRA-3578 where getPendingTasks in AbstractCommitLogService was
> changed from returning queue.size() to returning pending.incrementAndGet().
> As a result this counter is incremented when getting value of
> Commitlog.PendingTasks from org.apache.cassandra.db (now deprecated) or
> CommitLog.PendingTasks from org.apache.cassandra.metrics.
> Could you please clarify if this is expected behavior?
> This was already mentioned in CASSANDRA-8531.
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