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Andrew Wang commented on HADOOP-13521: -------------------------------------- We should probably rip out MutableQuantiles and replace it with HdrHistogram, in retrospect MQ is over-engineered. > 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 > Attachments: Screen Shot 2015-07-09 at 12.37.29 PM.png > > > 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. -- This message was sent by Atlassian JIRA (v6.3.4#6332) --------------------------------------------------------------------- To unsubscribe, e-mail: common-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: common-issues-h...@hadoop.apache.org