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From "Michael McCandless (JIRA)" <>
Subject [jira] [Created] (LUCENE-4484) NRTCachingDir can't handle large files
Date Mon, 15 Oct 2012 23:21:06 GMT
Michael McCandless created LUCENE-4484:

             Summary: NRTCachingDir can't handle large files
                 Key: LUCENE-4484
             Project: Lucene - Core
          Issue Type: Bug
            Reporter: Michael McCandless

I dug into this OOME, which easily repros for me on rev 1398268:
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

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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