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https://issues.apache.org/jira/browse/CASSANDRA-8341?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14229796#comment-14229796
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T Jake Luciani commented on CASSANDRA-8341:
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I added some code to do this in a branch and have been meaning to break it out.
It adds LatencyMetrics to AbstractTracingAwareExecutorService and tracks time
spent in queue for each FutureTask.
The code is here
https://github.com/tjake/cassandra/compare/new-executor#diff-9860b2ae7a7e9e05e2165fd319f1398eL26
The SEPExecutor would need something similar added.
> 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, 8341v2.txt
>
>
> 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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