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From Simon Willnauer <simon.willna...@googlemail.com>
Subject Re: ArrayIndexOutOfBoundsException when iterating over TermDocs
Date Fri, 24 Sep 2010 05:12:33 GMT
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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