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https://issues.apache.org/jira/browse/LUCENE-4241?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13419451#comment-13419451
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Robert Muir commented on LUCENE-4241:
-------------------------------------

ok, i know i ran into hellacious problems trying to get all tests using 
mockdirectorywrapper, i had to disable it
in the TestReplicationHandler for this reason because it adds files outside of 
the directory api, calling sync itself
(but mockdirectorywrapper doesnt know about this).

This also makes it impossible to re-use MDW's facilities for testing disk full 
etc (e.g. SOLR-3023).
                
> non-reproducible failures from RecoveryZkTest - mostly 
> NRTCachingDirectory.deleteFile
> -------------------------------------------------------------------------------------
>
>                 Key: LUCENE-4241
>                 URL: https://issues.apache.org/jira/browse/LUCENE-4241
>             Project: Lucene - Java
>          Issue Type: Bug
>            Reporter: Hoss Man
>         Attachments: 
> RecoveryZkTest.testDistribSearch-100-tests-failures.txt.tgz, just-failures.txt
>
>
> Since getting my new laptop, i've noticed some sporadic failures from 
> RecoveryZkTest, so last night tried running 100 iterations againts trunk 
> (r1363555), and got 5 errors/failures...
> * 3 asertion failures from NRTCachingDirectory.deleteFile
> * 1 node recovery assertion from 
> AbstractDistributedZkTestCase.waitForRecoveriesToFinish caused by OOM
> * 1 searcher leak assertion: opens=1658 closes=1652 (possibly lingering 
> affects from OOM?)
> see comments/attachments for details

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