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Posted to dev@lucene.apache.org by "Sergiusz Urbaniak (JIRA)" <ji...@apache.org> on 2013/05/16 09:43:16 UTC
[jira] [Created] (LUCENE-5002) Deadlock in
DocumentsWriterFlushControl
Sergiusz Urbaniak created LUCENE-5002:
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Summary: 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
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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