Hi Drools squad,
This is a follow-up to my previous speed-related post. By boss is still
pushing to get 35ms down a bit, and I'm looking at parallelization options.
I've looked through the forums, but not successfully...
The options I see, are:
1. KnowledgeBase partitioning (setting KnowledgeBaseConfiguration to use
multi-threads)
- I tried this, and got the error pasted at the bottom. My suspicion is
that it starts a thread, and meanwhile the Java thread continues, and
disposes of the session before evaluation is complete.
2. Creating multiple Java threads, each of which starts its own
KnowledgeSession.
- I started this, but need to confirm that this is possible. What's
happening currently, is that the Java thread continues, and closes my
database connection prematurely, and so, I am working on adding some sort of
counting-semaphore, to wait for all the threads to complete before
continuing the Java thread.
Should I pursue either of these ideas? I will probably work on the second
today. The other idea I had was to try Sequential Mode, but I don't think
my data is applicable to a StatelessKnowledgeSession.
Thanks,
Daniel
***************************
Partition task manager caught an unexpected exception: null
Drools is capturing the exception to avoid thread death. Please report stack
trace to development team.
java.util.concurrent.RejectedExecutionException
at
java.util.concurrent.ThreadPoolExecutor$AbortPolicy.rejectedExecution(ThreadPoolExecutor.java:1760)
at
java.util.concurrent.ThreadPoolExecutor.reject(ThreadPoolExecutor.java:767)
at
java.util.concurrent.ThreadPoolExecutor.ensureQueuedTaskHandled(ThreadPoolExecutor.java:758)
at
java.util.concurrent.ThreadPoolExecutor.execute(ThreadPoolExecutor.java:655)
at
org.drools.reteoo.PartitionTaskManager.enqueue(PartitionTaskManager.java:75)
at
org.drools.reteoo.AsyncCompositeObjectSinkAdapter.doPropagateAssertObject(AsyncCompositeObjectSinkAdapter.java:49)
at
org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:344)
at org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:147)
at
org.drools.reteoo.PartitionTaskManager$FactAssertAction.execute(PartitionTaskManager.java:188)
at
org.drools.reteoo.PartitionTaskManager$PartitionTask.run(PartitionTaskManager.java:112)
at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:619)
--
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