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From "Simon Willnauer (JIRA)" <j...@apache.org>
Subject [jira] Updated: (LUCENE-1566) Large Lucene index can hit false OOM due to Sun JRE issue
Date Mon, 29 Jun 2009 17:40:47 GMT

     [ https://issues.apache.org/jira/browse/LUCENE-1566?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Simon Willnauer updated LUCENE-1566:
------------------------------------

    Attachment: LUCENE-1566.patch

I was able to reproduce the bug on my machine using several JVMs. The attached patch is what
I got ready by now - I though I get it out there as soon as possible for discussion.
Test pass on my side!

> 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
>         Attachments: LUCENE-1566.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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