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Posted to issues@hbase.apache.org by "Enis Soztutar (JIRA)" <ji...@apache.org> on 2013/06/07 05:17:20 UTC
[jira] [Commented] (HBASE-8700) IntegrationTestBigLinkedList can
fail due to random number collision
[ https://issues.apache.org/jira/browse/HBASE-8700?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13677781#comment-13677781 ]
Enis Soztutar commented on HBASE-8700:
--------------------------------------
We should also note that we ran into this lately, and thanks to Sergey's magic debugging skills was able to find the root cause.
> IntegrationTestBigLinkedList can fail due to random number collision
> --------------------------------------------------------------------
>
> Key: HBASE-8700
> URL: https://issues.apache.org/jira/browse/HBASE-8700
> Project: HBase
> Issue Type: Bug
> Reporter: Sergey Shelukhin
> Assignee: Sergey Shelukhin
>
> The test can fail due to random number collision, claiming there are unreferenced elements for obvious reasons (we rewrite some link). Original Accumulo test has one-stage generation so it doesn't count unreferenced elements as failures, only undefined ones. With 200m longs out of half-long range the probability of collision is approx 0.2%.
> Moreover, without some way to debug, it's hard to debug what keys should be looked at in such cases
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