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  1. Cassandra
  2. CASSANDRA-14194

Chain commit log marker potential performance regression in batch commit mode

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    • Severity:
      Normal

      Description

      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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            • Assignee:
              jasobrown Jason Brown Assign to me
              Reporter:
              aweisberg Ariel Weisberg
              Authors:
              Jason Brown
              Reviewers:
              Ariel Weisberg

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