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From Shay Banon <kim...@gmail.com>
Subject Re: ArrayIndexOutOfBoundsException when iterating over TermDocs
Date Fri, 24 Sep 2010 09:07:22 GMT
Sure, opened https://issues.apache.org/jira/browse/LUCENE-2666, wanted to
ping the list first to see if someone knows about it.

On Fri, Sep 24, 2010 at 7:12 AM, Simon Willnauer <
simon.willnauer@googlemail.com> wrote:

> Shay,
>
> would you mind open a jira issue for that?
>
> simon
>
> On Fri, Sep 24, 2010 at 2:53 AM, Shay Banon <kimchy@gmail.com> wrote:
> > Hi,
> >
> >    A user got this very strange exception, and I managed to get the index
> > that it happens on. Basically, iterating over the TermDocs causes an
> AAOIB
> > exception. I easily reproduced it using the FieldCache which does exactly
> > that (the field in question is indexed as numeric). Here is the
> exception:
> >
> > Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 114
> > at org.apache.lucene.util.BitVector.get(BitVector.java:104)
> >  at
> org.apache.lucene.index.SegmentTermDocs.next(SegmentTermDocs.java:127)
> > at
> >
> org.apache.lucene.search.FieldCacheImpl$LongCache.createValue(FieldCacheImpl.java:501)
> >  at
> >
> org.apache.lucene.search.FieldCacheImpl$Cache.get(FieldCacheImpl.java:183)
> > at
> org.apache.lucene.search.FieldCacheImpl.getLongs(FieldCacheImpl.java:470)
> >  at TestMe.main(TestMe.java:56)
> >
> > It happens on the following segment: _26t docCount: 914 delCount: 1
> > delFileName: _26t_1.del
> >
> > And as you can see, it smells like a corner case (it fails for document
> > number 912, the AIOOB happens from the deleted docs). The code to
> recreate
> > it is simple:
> >
> >        FSDirectory dir = FSDirectory.open(new File("index"));
> >        IndexReader reader = IndexReader.open(dir, true);
> >
> >        IndexReader[] subReaders = reader.getSequentialSubReaders();
> >        for (IndexReader subReader : subReaders) {
> >            Field field =
> > subReader.getClass().getSuperclass().getDeclaredField("si");
> >            field.setAccessible(true);
> >            SegmentInfo si = (SegmentInfo) field.get(subReader);
> >            System.out.println("--> " + si);
> >            if (si.getDocStoreSegment().contains("_26t")) {
> >                // this is the probleatic one...
> >                System.out.println("problematic one...");
> >                FieldCache.DEFAULT.getLongs(subReader, "__documentdate",
> > FieldCache.NUMERIC_UTILS_LONG_PARSER);
> >            }
> >        }
> >
> > Here is the result of a check index on that segment:
> >
> >  8 of 10: name=_26t docCount=914
> >    compound=true
> >    hasProx=true
> >    numFiles=2
> >    size (MB)=1.641
> >    diagnostics = {optimize=false, mergeFactor=10,
> > os.version=2.6.18-194.11.1.el5.centos.plus, os=Linux,
> mergeDocStores=true,
> > lucene.version=3.0.2 953716 - 2010-06-11 17:13:53, source=merge,
> > os.arch=amd64, java.version=1.6.0, java.vendor=Sun Microsystems Inc.}
> >    has deletions [delFileName=_26t_1.del]
> >    test: open reader.........OK [1 deleted docs]
> >    test: fields..............OK [32 fields]
> >    test: field norms.........OK [32 fields]
> >    test: terms, freq, prox...ERROR [114]
> > java.lang.ArrayIndexOutOfBoundsException: 114
> > at org.apache.lucene.util.BitVector.get(BitVector.java:104)
> >  at
> org.apache.lucene.index.SegmentTermDocs.next(SegmentTermDocs.java:127)
> > at
> >
> org.apache.lucene.index.SegmentTermPositions.next(SegmentTermPositions.java:102)
> >  at org.apache.lucene.index.CheckIndex.testTermIndex(CheckIndex.java:616)
> > at org.apache.lucene.index.CheckIndex.checkIndex(CheckIndex.java:509)
> >  at org.apache.lucene.index.CheckIndex.checkIndex(CheckIndex.java:299)
> > at TestMe.main(TestMe.java:47)
> >    test: stored fields.......ERROR [114]
> > java.lang.ArrayIndexOutOfBoundsException: 114
> > at org.apache.lucene.util.BitVector.get(BitVector.java:104)
> >  at
> >
> org.apache.lucene.index.ReadOnlySegmentReader.isDeleted(ReadOnlySegmentReader.java:34)
> > at
> org.apache.lucene.index.CheckIndex.testStoredFields(CheckIndex.java:684)
> >  at org.apache.lucene.index.CheckIndex.checkIndex(CheckIndex.java:512)
> > at org.apache.lucene.index.CheckIndex.checkIndex(CheckIndex.java:299)
> >  at TestMe.main(TestMe.java:47)
> >    test: term vectors........ERROR [114]
> > java.lang.ArrayIndexOutOfBoundsException: 114
> > at org.apache.lucene.util.BitVector.get(BitVector.java:104)
> >  at
> >
> org.apache.lucene.index.ReadOnlySegmentReader.isDeleted(ReadOnlySegmentReader.java:34)
> > at
> org.apache.lucene.index.CheckIndex.testTermVectors(CheckIndex.java:721)
> >  at org.apache.lucene.index.CheckIndex.checkIndex(CheckIndex.java:515)
> > at org.apache.lucene.index.CheckIndex.checkIndex(CheckIndex.java:299)
> >  at TestMe.main(TestMe.java:47)
> >
> >
> >
> > The creation of the index does not do something fancy (all defaults),
> though
> > there is usage of the near real time aspect (IndexWriter#getReader) which
> > does complicate deleted docs handling. Seems like the deleted docs got
> > written without matching the number of docs?. Sadly, I don't have
> something
> > that recreates it from scratch, but I do have the index if someone want
> to
> > have a look at it (mail me directly and I will provide a download link).
> >
> > I will continue to investigate why this might happen, just wondering if
> > someone stumbled on this exception before. Lucene 3.0.2 is used.
> >
> > -shay.banon
> >
>
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