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https://issues.apache.org/jira/browse/CASSANDRA-14194?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16341428#comment-16341428
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Jason Brown commented on CASSANDRA-14194:
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[~aweisberg] any chance you might still have the jstack output (and can attach
it here)?
> Chain commit log marker potential performance regression in batch commit mode
> -----------------------------------------------------------------------------
>
> Key: CASSANDRA-14194
> URL: https://issues.apache.org/jira/browse/CASSANDRA-14194
> Project: Cassandra
> Issue Type: Bug
> Components: Core, Testing
> Reporter: Ariel Weisberg
> Assignee: Jason Brown
> Priority: Major
>
> CASSANDRA-13987 modified how the commit log sync thread works. I noticed that
> cql3.ViewTest and ViewTaskTest have been timing out, but only in CircleCI.
> When I jstack in CircleCI what I see is that the commit log writer thread is
> parked and the threads trying to append to the commit log are blocked waiting
> on it.
> I tested the commit before 13987 and it passed in CircleCI and then I tested
> with 13987 and it timed out. I suspect this may be a general performance
> regression and not just a CircleCI issue.
> And this is with write barriers disabled (sync thread doesn't actually sync)
> so it wasn't blocked in the filesystem.
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