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
