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From "Simon Willnauer (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-4114) Large docID / docvalue size combination produces arithmetic overflow
Date Thu, 07 Jun 2012 08:11:23 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-4114?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13290878#comment-13290878
] 

Simon Willnauer commented on LUCENE-4114:
-----------------------------------------

thanks mike!
                
> Large docID / docvalue size combination produces arithmetic overflow
> --------------------------------------------------------------------
>
>                 Key: LUCENE-4114
>                 URL: https://issues.apache.org/jira/browse/LUCENE-4114
>             Project: Lucene - Java
>          Issue Type: Bug
>          Components: core/codecs
>    Affects Versions: 4.0, 5.0
>         Environment: Ubuntu 10.04
> Sun Java 6 b26
> MultiIndex over six directoryindices with ~80M documents each.
>            Reporter: Walt Elder
>             Fix For: 4.0, 5.0
>
>         Attachments: LUCENE-4114.patch
>
>   Original Estimate: 2h
>  Remaining Estimate: 2h
>
> My test case has run across an arithmetic bug in FixedStraightBytesImpl - specifically
in the @Override on position(int). The combination of size=32 and docID = 70M produces a negative
integer and causes a stacktrace in MMapDirectory.seek(long) which I will post below.  I would
imagine that this hasn't been hit before because most index shards have less than 70M documents.
> That is to say, when asking for the docvalue in a FixedStraightBytes field where the
size of values are 32 and the docID can be sufficiently high, an arithmetic overflow occurs
in line 359 of FixedStraightBytesImpl.java, causing the method to return a negative value
when operating on the first (0th) shard with a baseOffset of 0.  This produces an IllegalArgumentException:
> Caused by: java.lang.IllegalArgumentException: Seeking to negative position: MMapIndexInput(_7_5_dv.dat
in path="/.../_7_dv.cfs" slice=5:2562955684)
>         at org.apache.lucene.store.MMapDirectory$MMapIndexInput.seek(MMapDirectory.java:396)
>         at org.apache.lucene.codecs.lucene40.values.FixedStraightBytesImpl$DirectFixedStraightSource.position(FixedStraightBytesImpl.java:359)
>         at org.apache.lucene.codecs.lucene40.values.DirectSource.getBytes(DirectSource.java:60)
>         at org.apache.lucene.codecs.lucene40.values.FixedStraightBytesImpl$DirectFixedStraightSource.getBytes(FixedStraightBytesImpl.java:349)
>         ...

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