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From "Doron Cohen (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-3501) random sampler is not random (and so facet SamplingWrapperTest occasionally fails)
Date Sun, 09 Oct 2011 15:21:29 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-3501?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13123703#comment-13123703
] 

Doron Cohen commented on LUCENE-3501:
-------------------------------------

The error (from Jenkins) was:

{noformat}
junit.framework.AssertionFailedError: Results are not the same!
	at org.apache.lucene.util.LuceneTestCaseRunner.runChild(LuceneTestCaseRunner.java:149)
	at org.apache.lucene.util.LuceneTestCaseRunner.runChild(LuceneTestCaseRunner.java:51)
	at org.apache.lucene.facet.FacetTestBase.assertSameResults(FacetTestBase.java:316)
	at org.apache.lucene.facet.search.sampling.BaseSampleTestTopK.assertSampling(BaseSampleTestTopK.java:93)
	at org.apache.lucene.facet.search.sampling.BaseSampleTestTopK.testCountUsingSamping(BaseSampleTestTopK.java:76)
	at org.apache.lucene.util.LuceneTestCase$2$1.evaluate(LuceneTestCase.java:610)

reproduce with: ant test -Dtestcase=SamplingWrapperTest -Dtestmethod=testCountUsingSamping
-Dtests.seed=39c6b88dcada2192:-cf936a4278714b1:-770b2814b4a6acd7
{noformat}

                
> random sampler is not random (and so facet SamplingWrapperTest occasionally fails)
> ----------------------------------------------------------------------------------
>
>                 Key: LUCENE-3501
>                 URL: https://issues.apache.org/jira/browse/LUCENE-3501
>             Project: Lucene - Java
>          Issue Type: Bug
>          Components: modules/facet
>            Reporter: Doron Cohen
>            Assignee: Doron Cohen
>            Priority: Minor
>
> RandomSample is not random at all:
> It does not even import java.util.Random, and its behavior is deterministic.
> in addition, the test testCountUsingSamping() never retries as it was supposed to (for
taking care of the hoped-for randomness).

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