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From "Simon Willnauer (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-1566) Large Lucene index can hit false OOM due to Sun JRE issue
Date Thu, 16 Jul 2009 15:59:15 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-1566?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12732000#action_12732000
] 

Simon Willnauer commented on LUCENE-1566:
-----------------------------------------

bq. Simon can you take a look? 

I looked at it closely and did run testcases again. Looks good to me! Thanks for looking at
it again!

simon

> Large Lucene index can hit false OOM due to Sun JRE issue
> ---------------------------------------------------------
>
>                 Key: LUCENE-1566
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1566
>             Project: Lucene - Java
>          Issue Type: Bug
>          Components: Index
>    Affects Versions: 2.4.1
>            Reporter: Michael McCandless
>            Assignee: Simon Willnauer
>            Priority: Minor
>             Fix For: 2.9
>
>         Attachments: LUCENE-1566.patch, LUCENE-1566.patch, LUCENE-1566.patch, LUCENE_1566_IndexInput.patch,
LUCENE_1566_IndexInput_Changes.patch, LUCENE_1566_IndexInput_Changes.patch
>
>
> This is not a Lucene issue, but I want to open this so future google
> diggers can more easily find it.
> There's this nasty bug in Sun's JRE:
>   http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6478546
> The gist seems to be, if you try to read a large (eg 200 MB) number of
> bytes during a single RandomAccessFile.read call, you can incorrectly
> hit OOM.  Lucene does this, with norms, since we read in one byte per
> doc per field with norms, as a contiguous array of length maxDoc().
> The workaround was a custom patch to do large file reads as several
> smaller reads.
> Background here:
>   http://www.nabble.com/problems-with-large-Lucene-index-td22347854.html

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