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