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From "Michael McCandless (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-1555) Deadlock while optimize
Date Wed, 11 Mar 2009 12:09:50 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-1555?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12680856#action_12680856
] 

Michael McCandless commented on LUCENE-1555:
--------------------------------------------


bq. It seems that the IndexWriter tries to lock two times.

Right, but the 2nd thread has called wait(), which internally releases
the lock, pauses, then tries to reaquire the lock and return.  So this
still looks relatively normal to me so far.

In this case, one thread has called IndexWriter.close.  That thread is
waiting for all merges to finish.  Another thread is trying to commit
a merge... but I don't understand why that other thread is blocked
trying to acquire the lock.

Have you changed the default settings on IndexWriter at all?  EG
number of merge threads, RAM buffer size, etc.?

Can you answer my other questions above?


> 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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