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From "Robert Muir (JIRA)" <>
Subject [jira] [Commented] (LUCENE-4484) NRTCachingDir can't handle large files
Date Mon, 15 Oct 2012 23:23:03 GMT


Robert Muir commented on LUCENE-4484:

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:
>             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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