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https://issues.apache.org/jira/browse/LUCENE-3066?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13028496#comment-13028496
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Adrian Nistor commented on LUCENE-3066:
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Hi Michael,
Thanks for the super fast reply!
> SegmentInfo is not actually thread safe; access to it inside Lucene is
> supposed to be guarded by IndexWriter's monitor lock.
Ah, very sorry, I did not realize this.
> That said, this issue looks a lot like LUCENE-3051 - is that where/how you
> hit
> a problem here? Or something else...?
No, totally unrelated. I am testing a tool for testing concurrent code. I
assumed that SegmentInfo is supposed to be thread safe and thus a good
candidate
for testing.
Thanks again for your reply and very sorry the trouble!
Thanks!
Adrian
> 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
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