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https://issues.apache.org/jira/browse/LUCENE-4484?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13476565#comment-13476565
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Robert Muir commented on LUCENE-4484:
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Can uncache() be changed to return the still-open newly created IndexOutput?
this way you could uncache() in writeBytes or wherever you want and it would be
seamless...
> NRTCachingDir can't handle large files
> --------------------------------------
>
> Key: LUCENE-4484
> URL: https://issues.apache.org/jira/browse/LUCENE-4484
> Project: Lucene - Core
> Issue Type: Bug
> Reporter: Michael McCandless
>
> I dug into this OOME, which easily repros for me on rev 1398268:
> {noformat}
> ant test -Dtestcase=Test4GBStoredFields -Dtests.method=test
> -Dtests.seed=2D89DD229CD304F5 -Dtests.multiplier=3 -Dtests.nightly=true
> -Dtests.slow=true
> -Dtests.linedocsfile=/home/hudson/lucene-data/enwiki.random.lines.txt
> -Dtests.locale=ru -Dtests.timezone=Asia/Vladivostok
> -Dtests.file.encoding=UTF-8 -Dtests.verbose=true
> {noformat}
> The problem is the test got NRTCachingDir ... which cannot handle large files
> because it decides up front (when createOutput is called) whether the file
> will be in RAMDir vs wrapped dir ... so if that file turns out to be immense
> (which this test does since stored fields files can grow arbitrarily huge w/o
> any flush happening) then it takes unbounded RAM.
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