[jira] [Created] (CASSANDRA-14194) Chain commit log marker potential performance regression in batch commit mode

["Ariel Weisberg (JIRA)" <ji...@apache.org>]

Ariel Weisberg created CASSANDRA-14194:
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             Summary: 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


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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