[jira] [Updated] (HBASE-21097) Flush pressure assertion may fail in testFlushThroughputTuning

["Ted Yu (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HBASE-21097?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ted Yu updated HBASE-21097:
---------------------------
    Attachment: 21097.v3.txt

> Flush pressure assertion may fail in testFlushThroughputTuning 
> ---------------------------------------------------------------
>
>                 Key: HBASE-21097
>                 URL: https://issues.apache.org/jira/browse/HBASE-21097
>             Project: HBase
>          Issue Type: Test
>            Reporter: Ted Yu
>            Assignee: Ted Yu
>            Priority: Major
>             Fix For: 3.0.0, 2.2.0
>
>         Attachments: 21097.v1.txt, 21097.v2.txt, 21097.v3.txt, HBASE-21097.patch
>
>
> From https://builds.apache.org/job/PreCommit-HBASE-Build/14137/artifact/patchprocess/patch-unit-hbase-server.txt :
> {code}
> [ERROR] testFlushThroughputTuning(org.apache.hadoop.hbase.regionserver.throttle.TestFlushWithThroughputController)  Time elapsed: 17.446 s  <<< FAILURE!
> java.lang.AssertionError: expected:<0.0> but was:<1.2906294173808417E-6>
> 	at org.apache.hadoop.hbase.regionserver.throttle.TestFlushWithThroughputController.testFlushThroughputTuning(TestFlushWithThroughputController.java:185)
> {code}
> Here is the related assertion:
> {code}
>     assertEquals(0.0, regionServer.getFlushPressure(), EPSILON);
> {code}
> where EPSILON = 1E-6
> In the above case, due to margin of 2.9E-7, the assertion didn't pass.
> It seems the epsilon can be adjusted to accommodate different workload / hardware combination.



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