Jason Brown updated CASSANDRA-14194:
    Fix Version/s: 4.x
           Status: Patch Available  (was: Open)

> 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
>             Fix For: 3.0.x, 3.11.x, 4.x
>         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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