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From "Michael McCandless (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-4484) NRTCachingDir can't handle large files
Date Tue, 16 Oct 2012 22:55:03 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-4484?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13477434#comment-13477434
] 

Michael McCandless commented on LUCENE-4484:
--------------------------------------------

bq. (Solr defaults to NRTCachingDir)

Maybe it shouldn't?

Or ... does it also default to NRT searching, like ElasticSearch (I think), i.e. frequently
opening a new searcher?  In which case it's a good default I think...
                
> 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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