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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