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From "Carlo Curino (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (YARN-6203) Occasional test failure in TestWeightedRandomRouterPolicy
Date Wed, 12 Apr 2017 15:46:41 GMT

     [ https://issues.apache.org/jira/browse/YARN-6203?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Carlo Curino updated YARN-6203:
-------------------------------
    Attachment: YARN-6203-YARN-2915.v0.patch

Flacking was due to the fact that variance of sampling was high for very small weights (normal).
I changed how weights are generated (closer to evenly spread). This also allowed to reduce
the number of samples to get within a good margin (1%), thus speeding up the test. 

I ran 1000 repeated runs of this test with not flackiness.

> Occasional test failure in TestWeightedRandomRouterPolicy
> ---------------------------------------------------------
>
>                 Key: YARN-6203
>                 URL: https://issues.apache.org/jira/browse/YARN-6203
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>    Affects Versions: YARN-2915
>            Reporter: Botong Huang
>            Assignee: Carlo Curino
>            Priority: Minor
>         Attachments: YARN-6203-YARN-2915.v0.patch
>
>
> Tests run: 8, Failures: 1, Errors: 0, Skipped: 0, Time elapsed: 8.432 sec <<<
FAILURE! - in org.apache.hadoop.yarn.server.federation.policies.router.TestWeightedRandomRouterPolicy
> testClusterChosenWithRightProbability(org.apache.hadoop.yarn.server.federation.policies.router.TestWeightedRandomRouterPolicy)
 Time elapsed: 7.437 sec  <<< FAILURE!
> java.lang.AssertionError: Id sc5 Actual weight: 0.00228 expected weight: 0.0018106138
> 	at org.junit.Assert.fail(Assert.java:88)
> 	at org.junit.Assert.assertTrue(Assert.java:41)
> 	at org.apache.hadoop.yarn.server.federation.policies.router.TestWeightedRandomRouterPolicy.testClusterChosenWithRightProbability(TestWeightedRandomRouterPolicy.java:118)



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