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From Mark Miller <markrmil...@gmail.com>
Subject Re: Thread leak hunt (solr), help needed.
Date Mon, 30 Jul 2012 22:01:26 GMT
Sami is probably the best person to weigh in on this. He will be back around starting next
Monday.

On Jul 30, 2012, at 4:33 PM, Dawid Weiss <dawid.weiss@gmail.com> wrote:

> So, I've started looking at thread leaks. Lucene tests are, so far,
> leak-free at the suite level. Solr has some problems and I could use
> some help in trying to figure out how to handle these. So, the first
> one is this:
> 
> TestMultiCoreConfBootstrap
> 
> This one leaks a thread from:
> 
> 	   1) Thread[id=22, name=Thread-3, state=WAITING, group=Overseer
> collection creation process.]
> 	        at sun.misc.Unsafe.park(Native Method)
> 	        at java.util.concurrent.locks.LockSupport.park(LockSupport.java:186)
>                ...
> 	        at java.util.concurrent.CountDownLatch.await(CountDownLatch.java:236)
> 	        at org.apache.solr.cloud.DistributedQueue$LatchChildWatcher.await(DistributedQueue.java:185)
> 	        at org.apache.solr.cloud.DistributedQueue.peek(DistributedQueue.java:291)
> 	        at org.apache.solr.cloud.OverseerCollectionProcessor.run(OverseerCollectionProcessor.java:81)
> 	        at java.lang.Thread.run(Thread.java:722)
> 
> This thread is started by Overseer(.java):
> 
>    ThreadGroup ccTg = new ThreadGroup("Overseer collection creation process.");
>    Thread ccThread = new Thread(ccTg, new
> OverseerCollectionProcessor(reader, id, shardHandler, adminPath));
>    ccThread.setDaemon(true);
>    ccThread.start();
> 
> The fact it's a daemon thread is fine, but it still shouldn't survive
> the end of the suite (should be closed/ interrupted). The problem is I
> don't see how it can be closed (or interrupted) in a clean way. I am
> completely green in terms of zookeeper -- what is it that I should
> close/ interrupt to shut this thing down cleanly?
> 
> Dawid
> 
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- Mark Miller
lucidimagination.com












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