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From "Walt (JIRA)" <j...@apache.org>
Subject [jira] [Created] (LUCENE-4114) Large docID / docvalue size combination produces arithmetic overflow
Date Tue, 05 Jun 2012 19:15:22 GMT
Walt created LUCENE-4114:
----------------------------

             Summary: 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
             Fix For: 4.0, 5.0


My test case has run across an arithmetic bug in FixedStraightBytesImpl - specifically in
the @Override on position(int). The combination of size=32 a
 nd 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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