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From "Michael McCandless (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-1555) Deadlock while optimize
Date Tue, 10 Mar 2009 11:40:50 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-1555?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12680441#action_12680441
] 

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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