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Michael McCandless commented on LUCENE-3066: -------------------------------------------- SegmentInfo is not actually thread safe; access to it inside Lucene is supposed to be guarded by IndexWriter's monitor lock. That said, this issue looks alot like LUCENE-3051 -- is that where/how you hit a problem here? Or something else...? > NullPointerException when calling sizeInBytes and setHasVectors concurrently. > ----------------------------------------------------------------------------- > > Key: LUCENE-3066 > URL: https://issues.apache.org/jira/browse/LUCENE-3066 > Project: Lucene - Java > Issue Type: Bug > Affects Versions: 3.1 > Environment: java 1.6.0_24 > Ubuntu 10.10 > Reporter: Adrian Nistor > Attachments: Test.java > > > Hi, > I am encountering a NullPointerException when using > org.apache.lucene.index.SegmentInfo. It appears in version 3.1.0 and also in > revision 1099085 (May 3rd 2011). > The NullPointerException is thrown by SegmentInfo.sizeInBytes(false) when > calling SegmentInfo.sizeInBytes(false) and SegmentInfo.setHasVectors(true) in > parallel. When these methods are called sequentially, they do not throw any > exception. > I have attached a test that exposes this problem. If you set ExposeBug = true, > the methods are called concurrently and you get the NullPointerException. If > you > set ExposeBug = false, the methods are called sequentially, and there is no > exception. Note that, in the sequential version, the methods are called many > times (just like in the parallel version), and in different orders (just like > in the parallel version). > The concurrent test (ExposeBug = true) always throws NullPointerException > under heavy load (ManyIterations = 100000000). Under small load (e.g., if you > set ManyIterations = 10), the NullPointerException will not manifest. I > suppose > you need a certain thread interleaving for the NullPointerException to happen, > and thus you need the heavy load. > Is this a bug? Is there a patch for it? > Thanks! > Adrian -- This message is automatically generated by JIRA. For more information on JIRA, see: http://www.atlassian.com/software/jira --------------------------------------------------------------------- To unsubscribe, e-mail: dev-unsubscr...@lucene.apache.org For additional commands, e-mail: dev-h...@lucene.apache.org