[jira] [Commented] (HBASE-12335) IntegrationTestRegionReplicaPerf is flaky

["Nick Dimiduk (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-12335?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14192882#comment-14192882 ] 

Nick Dimiduk commented on HBASE-12335:
--------------------------------------

I should emphasize, we probably need to return to this test. 1mm rows / 4 client threads * 0.1 sample rate = 25k requests per client. This is a tiny number, means the 99.9pct is only 25 requests and is not very realistic vs a production workload serving billions of requests/hour.

> 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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