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From "Mark Miller (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-4484) NRTCachingDir can't handle large files
Date Wed, 17 Oct 2012 02:04:04 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-4484?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13477536#comment-13477536
] 

Mark Miller commented on LUCENE-4484:
-------------------------------------

Right, we have changed the defaults to favor NRT.

You can always say to switch that if someone runs into a problem, but of course it would be
nicer if NRTCachingDir was more versatile and could deal well with term vectors / stored fields.

I agree it's more of a niche situation (it's not likely a common problem), but it would be
my preference.
                
> 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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