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From "Mark Miller (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-4484) NRTCachingDir can't handle large files
Date Tue, 16 Oct 2012 13:15:02 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-4484?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13476977#comment-13476977
] 

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

Yeah, I know - its a special case of stored fields and term vectors - but it would still be
great if it was a special case you didn't have to worry about.

It's not the end of the world - if someone has problems we can tell them to stop using NRTCachingDir
- but it would also be great if it just worked well in that case too.

(Solr defaults to NRTCachingDir)
                
> 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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