Can you post a patch with your full changes to DocumentsWriter and
IndexWriter?
That first thread is trying to flush, but is waiting for all threads
to leave DocumentsWriter (finish adding docs). The 2nd thread looks
like it's waiting for the flush to finish before proceeding. Are
there any other threads?
Are you calling DocumentsWriter.finishDocument? That method frees the
thread state, which is what that first thread is waiting on...
Mike
Jagadesh Nomula wrote:
Would anyone be having any insight into deadlock issues, when
running DocumentsWriter.java from multiple threads ?. I am trying to
port ParallelWriter.java code to new codebase of
DocumentsWriter.java and IndexWriter. I am doing this by splitting,
DocumentsWriter.addDocument call into two methods unsynchronized
methods, doGetThreadState and finishDocWithThreadState.
doGetThreadState just calls the synchronized getThreadState method
and returns a thread state to be used by finishDocWithThreadState,
which inverts the document and flushes it. The code base is
semantically equivalent to addDocument method in DocumentsWriter,
the only variation being, call to doGetThreadState executed from a
synched block in ParallelWriter to maintain the consistency of same
doc-ids in parallelWriter.
You would imagine that, this code would work without any issues, but
it runs into a deadlock. The excerpt of suspicious calls is:
== Thread ConnectionThreadGroup-26491.pool-8-thread-1 ===>
java.lang.Object.wait(Native Method)
java.lang.Object.wait(Object.java:485)
org
.apache
.lucene.index.DocumentsWriter.pauseAllThreads(DocumentsWriter.java:
507)
org.apache.lucene.index.IndexWriter.doFlush(IndexWriter.java:
2670)
org.apache.lucene.index.IndexWriter.flush(IndexWriter.java:
2660)
org.apache.lucene.index.IndexWriter.finishDoc(IndexWriter.java:1601)
org.apache.lucene.index.ParallelWriter
$ProcessWorker.run(ParallelWriter.java:464)
java.util.concurrent.ThreadPoolExecutor
$Worker.runTask(ThreadPoolExecutor.java:885)
java.util.concurrent.ThreadPoolExecutor
$Worker.run(ThreadPoolExecutor.java:907)
java.lang.Thread.run(Thread.java:619)
=======================================
== Thread ConnectionThreadGroup-26491.pool-3-thread-6 ===>
java.lang.Object.wait(Native Method)
java.lang.Object.wait(Object.java:485)
org
.apache
.lucene.index.DocumentsWriter.getThreadState(DocumentsWriter.java:
2420)
org
.apache
.lucene.index.DocumentsWriter.doGetThreadState(DocumentsWriter.java:
2532)
org.apache.lucene.index.IndexWriter.getThreadState(IndexWriter.java:
1564)
org.apache.lucene.index.ParallelWriter
$ThreadStateWorker.call(ParallelWriter.java:425)
org.apache.lucene.index.ParallelWriter
$ThreadStateWorker.call(ParallelWriter.java:405)
java.util.concurrent.FutureTask
$Sync.innerRun(FutureTask.java:303)
java.util.concurrent.FutureTask.run(FutureTask.java:138)
java.util.concurrent.ThreadPoolExecutor
$Worker.runTask(ThreadPoolExecutor.java:885)
java.util.concurrent.ThreadPoolExecutor
$Worker.run(ThreadPoolExecutor.java:907)
java.lang.Thread.run(Thread.java:619)
Any info, that I might be overlooking or any comments would be of
great help to me in resolving this. Thanks in advance for your help.
Jagdish
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