Andrew Whang created CASSANDRA-14085:
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Summary: 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
Priority: Minor
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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