Mark Wagner created HADOOP-13521:
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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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