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https://issues.apache.org/jira/browse/CASSANDRA-1869?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12972245#action_12972245
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Jonathan Ellis commented on CASSANDRA-1869:
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You want the stage latency separate from waiting-in-queue latency (which can be
easily derived from queue size * latency).
If we need actually accurate, or at least histogram-accurate queue wait
durations, we could track that separately, but just adding it into the existing
stage latency would be a step backwards.
> Read and Write latencies should include stage queue time
> --------------------------------------------------------
>
> Key: CASSANDRA-1869
> URL: https://issues.apache.org/jira/browse/CASSANDRA-1869
> Project: Cassandra
> Issue Type: Bug
> Reporter: Stu Hood
>
> Our currently measured read and write latencies (as exposed on the CFS MBean)
> should include the time spent queued in the read/write stages: only the
> active time is currently measured, and this is much less useful.
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