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https://issues.apache.org/jira/browse/CASSANDRA-14194?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16342247#comment-16342247
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Jason Brown commented on CASSANDRA-14194:
-----------------------------------------
I've run the head of cassandra-3.11 (currently sha
{{b8c12fba064fb0b6a3b6306b2670497434471920}}), and it completed in the same
time that cassandra-3.0 did (no timeout). I ran trunk (sha
{{6fc3699adb4f609f78a40888af9797bb205216b0}}), and it *did* timeout.
I'm running 3.0 and 3.11 in circleci to see if they timeout. If not, then I
think the regression is on trunk alone, and I'll focus my effort there.
Obviously, if the source of the source looks like it'll affect earlier
versions, i'll dig into that,as well.
> 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
> Attachments: jstack.txt
>
>
> CASSANDRA-13987 modified how the commit log sync thread works. I noticed that
> cql3.ViewTest and ViewBuilderTaskTest 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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