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From "Shai Erera (JIRA)" <j...@apache.org>
Subject [jira] [Created] (LUCENE-4596) DirectoryTaxonomyWriter concurrency bug
Date Fri, 07 Dec 2012 13:31:21 GMT
Shai Erera created LUCENE-4596:
----------------------------------

             Summary: DirectoryTaxonomyWriter concurrency bug
                 Key: LUCENE-4596
                 URL: https://issues.apache.org/jira/browse/LUCENE-4596
             Project: Lucene - Core
          Issue Type: Bug
          Components: modules/facet
            Reporter: Shai Erera
            Assignee: Shai Erera


Mike tripped this error while running some benchmarks:

{no format}
Caused by: java.lang.ArrayIndexOutOfBoundsException: 130
        at org.apache.lucene.facet.taxonomy.directory.DirectoryTaxonomyWriter.getParent(DirectoryTaxonomyWriter.java:835)
        at org.apache.lucene.facet.index.streaming.CategoryParentsStream.incrementToken(CategoryParentsStream.java:106)
        at org.apache.lucene.facet.index.streaming.CountingListTokenizer.incrementToken(CountingListTokenizer.java:63)
        at org.apache.lucene.facet.index.streaming.CategoryTokenizer.incrementToken(CategoryTokenizer.java:48)
        at org.apache.lucene.index.DocInverterPerField.processFields(DocInverterPerField.java:177)
        at org.apache.lucene.index.DocFieldProcessor.processDocument(DocFieldProcessor.java:272)
        at org.apache.lucene.index.DocumentsWriterPerThread.updateDocument(DocumentsWriterPerThread.java:250)
        at org.apache.lucene.index.DocumentsWriter.updateDocument(DocumentsWriter.java:376)
        at org.apache.lucene.index.IndexWriter.updateDocument(IndexWriter.java:1455)
        at org.apache.lucene.index.IndexWriter.addDocument(IndexWriter.java:1130)
        at org.apache.lucene.index.IndexWriter.addDocument(IndexWriter.java:1111)
        at perf.IndexThreads$IndexThread.run(IndexThreads.java:335)
{noformat}

At first we thought this might be related to LUCENE-4565, but he reverted to before that commit
and still hit the exception. I modified TestDirTaxoWriter.testConcurrency to index hierarchical
categories, thinking that's the cause, but failed to reproduce.

Eventually I realized that the test doesn't call getParent(), because it tests DirTaxoWriter
concurrency, not concurrent indexing. As soon as I added a call to getParent, I hit this exception
too.

Adding 'synchronized' to DirTaxoWriter.addCategory seems to avoid that ex.

I'll upload a patch with the modifications to the test and dig.

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