[jira] [Commented] (CASSANDRA-12626) LWT contention appears to be under reported

["Jeff Jirsa (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CASSANDRA-12626?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15481071#comment-15481071 ] 

Jeff Jirsa commented on CASSANDRA-12626:
----------------------------------------

Pushed here: https://github.com/jeffjirsa/cassandra/tree/cassandra-12626
For CI: http://cassci.datastax.com/job/jeffjirsa-cassandra-12626-testall/1/
and dtests: http://cassci.datastax.com/job/jeffjirsa-cassandra-12626-dtest/1/



> LWT contention appears to be under reported
> -------------------------------------------
>
>                 Key: CASSANDRA-12626
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-12626
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Observability
>            Reporter: Christopher Batey
>            Assignee: Christopher Batey
>            Priority: Minor
>             Fix For: 3.x
>
>
> I was surprised how little contention was being reported and looking at the code we miss out reporting contention when there is a timeout at the prepare phase.
> If this {{StorageProxy.beginAndRepairPaxos}} throws then the contentions count isn't added to the histogram.



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