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https://issues.apache.org/jira/browse/CASSANDRA-14085?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jeff Jirsa reassigned CASSANDRA-14085:
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Assignee: Andrew Whang
> Excessive update of ReadLatency metric in digest calculation
> ------------------------------------------------------------
>
> Key: CASSANDRA-14085
> URL: https://issues.apache.org/jira/browse/CASSANDRA-14085
> Project: Cassandra
> Issue Type: Bug
> Components: Metrics
> Reporter: Andrew Whang
> Assignee: Andrew Whang
> Priority: Minor
> Fix For: 3.0.16, 4.0
>
>
> We noticed an increase in read latency after upgrading to 3.x, specifically
> for requests with CL>ONE. It turns out the read latency metric is being
> doubly updated for digest calculations. This code
> (https://github.com/apache/cassandra/blob/trunk/src/java/org/apache/cassandra/db/partitions/UnfilteredPartitionIterators.java#L243)
> makes an improper copy of an iterator that's wrapped by MetricRecording,
> whose onClose() records the latency of the execution.
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