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https://issues.apache.org/jira/browse/LUCENE-5002?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13660658#comment-13660658
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Michael McCandless commented on LUCENE-5002:
--------------------------------------------
OK I opened LUCENE-5006.
> Deadlock in DocumentsWriterFlushControl
> ---------------------------------------
>
> Key: LUCENE-5002
> URL: https://issues.apache.org/jira/browse/LUCENE-5002
> Project: Lucene - Core
> Issue Type: Bug
> Affects Versions: 4.3
> Environment: OpenJDK 64-Bit Server VM (23.7-b01 mixed mode)
> Linux Ubuntu Server 12.04 LTS 64-Bit
> Reporter: Sergiusz Urbaniak
> Assignee: Simon Willnauer
> Fix For: 5.0, 4.4, 4.3.1
>
> Attachments: LUCENE-5002.patch, LUCENE-5002_test.patch
>
>
> Hi all,
> We have an obvious deadlock between a "MaybeRefreshIndexJob" thread
> calling ReferenceManager.maybeRefresh(ReferenceManager.java:204) and a
> "RebuildIndexJob" thread calling
> IndexWriter.deleteAll(IndexWriter.java:2065).
> Lucene wants to flush in the "MaybeRefreshIndexJob" thread trying to
> intrinsically lock the IndexWriter instance at
> {{DocumentsWriterPerThread.java:563}} before notifyAll()ing the flush.
> Simultaneously the "RebuildIndexJob" thread who already intrinsically locked
> the IndexWriter instance at IndexWriter#deleteAll wait()s at
> {{DocumentsWriterFlushControl.java:245}} for the flush forever causing a
> deadlock.
> {code}
> "MaybeRefreshIndexJob Thread - 2" daemon prio=10 tid=0x00007f8fe4006000
> nid=0x1ac2 waiting for monitor entry [0x00007f8fa7bf7000]
> java.lang.Thread.State: BLOCKED (on object monitor)
> at
> org.apache.lucene.index.IndexWriter.useCompoundFile(IndexWriter.java:2223)
> - waiting to lock <0x00000000f1c00438> (a
> org.apache.lucene.index.IndexWriter)
> at
> org.apache.lucene.index.DocumentsWriterPerThread.sealFlushedSegment(DocumentsWriterPerThread.java:563)
> at
> org.apache.lucene.index.DocumentsWriterPerThread.flush(DocumentsWriterPerThread.java:533)
> at
> org.apache.lucene.index.DocumentsWriter.doFlush(DocumentsWriter.java:422)
> at
> org.apache.lucene.index.DocumentsWriter.flushAllThreads(DocumentsWriter.java:559)
> at org.apache.lucene.index.IndexWriter.getReader(IndexWriter.java:365)
> - locked <0x00000000f1c007d0> (a java.lang.Object)
> at
> org.apache.lucene.index.StandardDirectoryReader.doOpenFromWriter(StandardDirectoryReader.java:270)
> at
> org.apache.lucene.index.StandardDirectoryReader.doOpenIfChanged(StandardDirectoryReader.java:245)
> at
> org.apache.lucene.index.StandardDirectoryReader.doOpenIfChanged(StandardDirectoryReader.java:235)
> at
> org.apache.lucene.index.DirectoryReader.openIfChanged(DirectoryReader.java:170)
> at
> org.apache.lucene.search.SearcherManager.refreshIfNeeded(SearcherManager.java:118)
> at
> org.apache.lucene.search.SearcherManager.refreshIfNeeded(SearcherManager.java:58)
> at
> org.apache.lucene.search.ReferenceManager.doMaybeRefresh(ReferenceManager.java:155)
> at
> org.apache.lucene.search.ReferenceManager.maybeRefresh(ReferenceManager.java:204)
> at jobs.MaybeRefreshIndexJob.timeout(MaybeRefreshIndexJob.java:47)
> "RebuildIndexJob Thread - 1" prio=10 tid=0x00007f903000a000 nid=0x1a38 in
> Object.wait() [0x00007f9037dd6000]
> java.lang.Thread.State: WAITING (on object monitor)
> at java.lang.Object.wait(Native Method)
> - waiting on <0x00000000f1c0c240> (a
> org.apache.lucene.index.DocumentsWriterFlushControl)
> at java.lang.Object.wait(Object.java:503)
> at
> org.apache.lucene.index.DocumentsWriterFlushControl.waitForFlush(DocumentsWriterFlushControl.java:245)
> - locked <0x00000000f1c0c240> (a
> org.apache.lucene.index.DocumentsWriterFlushControl)
> at
> org.apache.lucene.index.DocumentsWriter.abort(DocumentsWriter.java:235)
> - locked <0x00000000f1c05370> (a
> org.apache.lucene.index.DocumentsWriter)
> at org.apache.lucene.index.IndexWriter.deleteAll(IndexWriter.java:2065)
> - locked <0x00000000f1c00438> (a org.apache.lucene.index.IndexWriter)
> at jobs.RebuildIndexJob.buildIndex(RebuildIndexJob.java:102)
> {code}
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