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From "Nick Dimiduk (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-10788) Add 99th percentile of latency in PE
Date Wed, 19 Mar 2014 05:11:48 GMT

    [ https://issues.apache.org/jira/browse/HBASE-10788?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13940186#comment-13940186
] 

Nick Dimiduk commented on HBASE-10788:
--------------------------------------

PerfEval already has percentiles, at least for the randomRead test. Would you like to add
support to the other tests?

https://github.com/apache/hbase/blob/0.98/hbase-server/src/test/java/org/apache/hadoop/hbase/PerformanceEvaluation.java#L785-L795

{noformat}
        LOG.info("randomRead latency log (ms), on " + times.length + " measures");
        LOG.info("99.9999% = " + ds.getPercentile(99.9999d));
        LOG.info(" 99.999% = " + ds.getPercentile(99.999d));
        LOG.info("  99.99% = " + ds.getPercentile(99.99d));
        LOG.info("   99.9% = " + ds.getPercentile(99.9d));
        LOG.info("     99% = " + ds.getPercentile(99d));
        LOG.info("     95% = " + ds.getPercentile(95d));
        LOG.info("     90% = " + ds.getPercentile(90d));
        LOG.info("     80% = " + ds.getPercentile(80d));
        LOG.info("Standard Deviation = " + ds.getStandardDeviation());
        LOG.info("Mean = " + ds.getMean());
{noformat}

> Add 99th percentile of latency in PE
> ------------------------------------
>
>                 Key: HBASE-10788
>                 URL: https://issues.apache.org/jira/browse/HBASE-10788
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Liu Shaohui
>            Assignee: Liu Shaohui
>            Priority: Minor
>         Attachments: HBASE-10788-trunk-v1.diff
>
>
> In production env, 99th percentile of latency is more important than the avg. The 99th
percentile is helpful to measure the influence of GC, slow read/write of HDFS.



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