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Posted to common-issues@hadoop.apache.org by "Elliott Clark (JIRA)" <ji...@apache.org> on 2016/08/19 21:57:22 UTC

[jira] [Comment Edited] (HADOOP-13521) SampleQuantile does not perform well under load

    [ https://issues.apache.org/jira/browse/HADOOP-13521?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15428907#comment-15428907 ] 

Elliott Clark edited comment on HADOOP-13521 at 8/19/16 9:56 PM:
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Also related: HBASE-15222


was (Author: eclark):
See HBASE-15222

> 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.



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