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https://issues.apache.org/jira/browse/LUCENE-4241?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13419459#comment-13419459
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Mark Miller commented on LUCENE-4241:
-------------------------------------

Yeah, I'm not ruling it out either - I try to be very careful before filing 
lucene bugs based on replication stuff and solrcloud especially (with all its 
jetty killing and what not). But I seemed to be able to cause the same 
situation with an isolated test (im not tripping the same assert, but causing a 
different exception in close because of the same invariant). So I'm somewhat 
sure it's a real issue with the dir, but since I don't have a fix, I don't know 
for sure. I tried just over syncing by synchronizing every method in that dir, 
but no luck :)
                
> 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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