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https://issues.apache.org/jira/browse/HBASE-10788?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13948910#comment-13948910
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Liu Shaohui commented on HBASE-10788:
-------------------------------------
Sample output
{code}
2014-03-27 13:02:04,935 INFO [TestClient-2] hbase.PerformanceEvaluation:
RandomWriteTest latency log (ms), on 1024 measures
2014-03-27 13:02:04,935 INFO [TestClient-2] hbase.PerformanceEvaluation:
RandomWriteTest Min = 0.0
2014-03-27 13:02:04,935 INFO [TestClient-2] hbase.PerformanceEvaluation:
RandomWriteTest Avg = 0.0341796875
2014-03-27 13:02:04,936 INFO [TestClient-2] hbase.PerformanceEvaluation:
RandomWriteTest StdDev = 0.2722120941128983
2014-03-27 13:02:04,937 INFO [TestClient-2] hbase.PerformanceEvaluation:
RandomWriteTest 50th = 0.0
2014-03-27 13:02:04,938 INFO [TestClient-2] hbase.PerformanceEvaluation:
RandomWriteTest 95th = 0.0
2014-03-27 13:02:04,938 INFO [TestClient-2] hbase.PerformanceEvaluation:
RandomWriteTest 99th = 1.0
2014-03-27 13:02:04,939 INFO [TestClient-2] hbase.PerformanceEvaluation:
RandomWriteTest 99.9th = 6.850000000000136
2014-03-27 13:02:04,939 INFO [TestClient-2] hbase.PerformanceEvaluation:
RandomWriteTest Max = 7.0
{code}
> Add 99th percentile of latency in PE
> ------------------------------------
>
> Key: HBASE-10788
> URL: https://issues.apache.org/jira/browse/HBASE-10788
> Project: HBase
> Issue Type: Improvement
> Affects Versions: 0.99.0
> Reporter: Liu Shaohui
> Assignee: Liu Shaohui
> Priority: Minor
> Attachments: HBASE-10788-trunk-v1.diff, HBASE-10788-trunk-v2.diff,
> HBASE-10788-trunk-v3.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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