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

["Christopher Batey (JIRA)" <ji...@apache.org>]

Christopher Batey created CASSANDRA-12626:
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             Summary: 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 variable isn't added to the metric.

The current way we do it means that we only update the counter once in the finally but given the expense of LWTs / the fact we also sleep after contention perhaps we should just increment it in the loop.



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