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https://issues.apache.org/jira/browse/LUCENE-1555?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12680441#action_12680441
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Michael McCandless commented on LUCENE-1555:
--------------------------------------------
Those thread stack traces actually look completely normal. Were there other
threads involved? Can you post them?
Are you running with assertions enabled? (The first stack trace is on an
assert line, which is interesting).
Also, if you're on Unix, with modern JREs if you "kill -QUIT" the process then
it'll give you all threads, and the stacktrace will include details about which
locks are held (your stack traces above don't seem to include this).
Are you certain you were in deadlock, vs an optimize that was taking a long
time to run?
How easy is it to reproduce this?
> Deadlock while optimize
> -----------------------
>
> Key: LUCENE-1555
> URL: https://issues.apache.org/jira/browse/LUCENE-1555
> Project: Lucene - Java
> Issue Type: Bug
> Components: Index
> Affects Versions: 2.4
> Environment: ubuntu 8.04, java 1.6 update 07, Lucene 2.4.0
> Reporter: Stefan Heidrich
> Assignee: Michael McCandless
>
> Sometimes after starting the thread with the indexer, the thread will hang in
> the following threads.
> Thread [Lucene Merge Thread #0] (Ausgesetzt)
> IndexWriter.commitMerge(MergePolicy$OneMerge, SegmentMerger, int) Line:
> 3751
> IndexWriter.mergeMiddle(MergePolicy$OneMerge) Line: 4240
> IndexWriter.merge(MergePolicy$OneMerge) Line: 3877
> ConcurrentMergeScheduler.doMerge(MergePolicy$OneMerge) Line: 205
> ConcurrentMergeScheduler$MergeThread.run() Line: 260
> Thread [Indexer] (Ausgesetzt)
> Object.wait(long) Line: not available [native Methode]
> IndexWriter.doWait() Line: 4491
> IndexWriter.optimize(int, boolean) Line: 2268
> IndexWriter.optimize(boolean) Line: 2203
> IndexWriter.optimize() Line: 2183
> Indexer.run() Line: 263
> If you need more informations, please let me know.
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