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https://issues.apache.org/jira/browse/CASSANDRA-8341?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14218111#comment-14218111
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Chris Lohfink commented on CASSANDRA-8341:
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Attached a first pass patch for an idea. I just recorded the wall time but may
want to record cpu time as well ([getCurrentThreadCpuTime &
getCurrentThreadUserTime|https://docs.oracle.com/javase/7/docs/api/java/lang/management/ThreadMXBean.html#getCurrentThreadCpuTime()]).
May be worth recording it with a histogram instead of just a counter as well,
but for the purpose of exposing % of time I think the total is sufficient. I
added an insertion meter as well for easier time in estimating different pool
sizes (just easier then adding up the pending/completed/active and give sense
of rate).
> Expose time spent in each thread pool
> -------------------------------------
>
> Key: CASSANDRA-8341
> URL: https://issues.apache.org/jira/browse/CASSANDRA-8341
> Project: Cassandra
> Issue Type: New Feature
> Components: Core
> Reporter: Chris Lohfink
> Priority: Minor
> Labels: metrics
> Attachments: 8341.patch
>
>
> Can increment a counter with time spent in each queue. This can provide
> context on how much time is spent percentage wise in each stage.
> Additionally can be used with littles law in future if ever want to try to
> tune the size of the pools.
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