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  1. Cassandra
  2. CASSANDRA-14085

Excessive update of ReadLatency metric in digest calculation

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    • Severity:
      Low
    • Since Version:

      Description

      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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            • Assignee:
              whangsf Andrew Whang
              Reporter:
              whangsf Andrew Whang
              Authors:
              Andrew Whang
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              • Created:
                Updated: