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From "Nick Dimiduk (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-12335) IntegrationTestRegionReplicaPerf is flaky
Date Sat, 01 Nov 2014 00:15:33 GMT

     [ https://issues.apache.org/jira/browse/HBASE-12335?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Nick Dimiduk updated HBASE-12335:
---------------------------------
    Release Note: This change alters PerformanceEvaluation to expose read request histograms
back to consumers. IntegrationTestRegionReplicaPerf takes advantage of this by examining the
histograms to determine the overall effectiveness of the feature under test. In this case,
specific summary statistics are aggregated across all threads and all test iterations to determine
success.

> IntegrationTestRegionReplicaPerf is flaky
> -----------------------------------------
>
>                 Key: HBASE-12335
>                 URL: https://issues.apache.org/jira/browse/HBASE-12335
>             Project: HBase
>          Issue Type: Test
>          Components: test
>    Affects Versions: 0.99.0, 2.0.0
>            Reporter: Nick Dimiduk
>            Assignee: Nick Dimiduk
>             Fix For: 2.0.0, 0.99.2
>
>         Attachments: HBASE-12335.00-0.99.patch, HBASE-12335.00.patch, HBASE-12335.00.patch,
HBASE-12335.00.patch, HBASE-12335.01-0.99.patch, HBASE-12335.01.patch, HBASE-12335.02.patch
>
>
> I find that this test often fails; the assertion that running with read replicas should
complete faster than without is usually false. I need to investigate further as to why this
is the case and how we should tune it.
> In the mean time, I'd like to change the test to assert instead on the average of the
stdev across all the test runs in each category. Meaning, enabling this feature should reduce
the overall latency variance experienced by the client.



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