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From "Mark Wagner (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-13521) SampleQuantile does not perform well under load
Date Fri, 19 Aug 2016 21:46:21 GMT
Mark Wagner created HADOOP-13521:

             Summary: SampleQuantile does not perform well under load
                 Key: HADOOP-13521
                 URL: https://issues.apache.org/jira/browse/HADOOP-13521
             Project: Hadoop Common
          Issue Type: Bug
          Components: metrics
    Affects Versions: 2.3.0
            Reporter: Mark Wagner

After adding quantile collection to one of our clusters we saw much higher latency for RPCs.
This was traced down to the quantile collection. Samples are being buffered and inserted in
groups of 500. After the buffered samples are inserted, the entire set of samples for this
time period (600 seconds at the longest for us) is "compressed".

All operations for RPC metrics are synchronized. Usually this isn't an issue but it seems
that this compression operation is taking a significant amount of time.

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