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From "Trym R. Møller" <>
Subject Re: Solr Hanging
Date Thu, 19 Apr 2012 13:18:36 GMT
Thanks for your answer.

I am running an (older) revision of solr from around the 29/2-2012

I suspect that the thread I have included is the leader of the shard?
The Solr instance, I have the dump from, contains more than one leader, 
so I don't know which shard (slice) the thread is working on. How can I 
find the solr instance containing the replica (I guess ZooKeeper can't 
help me)?
And when I have found the solr instance containing the replica, how do I 
know which thread is handling the update request (all my solr instances 
contains 8 cores)?

If this is not possible, I might be able to restart with a setup where 
each Solr instances only contains a single core (a leader or a replica).

Best regards Trym

Den 19-04-2012 14:36, Yonik Seeley skrev:
> On Thu, Apr 19, 2012 at 4:25 AM, "Trym R. Møller"<>  wrote:
>> Hi
>> I am using Solr trunk and have 7 Solr instances running with 28 leaders and
>> 28 replicas for a single collection.
>> After indexing a while (a couple of days) the solrs start hanging and doing
>> a thread dump on the jvm I see blocked threads like the following:
>>     Thread 2369: (state = BLOCKED)
>>      - sun.misc.Unsafe.park(boolean, long) @bci=0 (Compiled frame;
>> information may be imprecise)
>>      - java.util.concurrent.locks.LockSupport.park(java.lang.Object) @bci=14,
>> line=158 (Compiled frame)
>>      -
>> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await()
>> @bci=42, line=1987 (Compiled frame)
>>      - java.util.concurrent.LinkedBlockingQueue.take() @bci=29, line=399
>> (Compiled frame)
>>      - java.util.concurrent.ExecutorCompletionService.take() @bci=4, line=164
>> (Compiled frame)
>>      - org.apache.solr.update.SolrCmdDistributor.checkResponses(boolean)
>> @bci=27, line=350 (Compiled frame)
>>      - org.apache.solr.update.SolrCmdDistributor.finish() @bci=18, line=98
>> (Compiled frame)
>>      - org.apache.solr.update.processor.DistributedUpdateProcessor.doFinish()
>> @bci=4, line=299 (Compiled frame)
>>      - org.apache.solr.update.processor.DistributedUpdateProcessor.finish()
>> @bci=1, line=817 (Compiled frame)
>>     ...
>>      - org.mortbay.thread.QueuedThreadPool$ @bci=25, line=582
>> (Interpreted frame)
>> I read the stack trace as my indexing client has indexed a document and this
>> Solr is now waiting for the replica? to respond before returning an answer
>> to the client.
> Correct.  What's the full stack trace like on both a leader and replica?
> We need to know what the replica is blocking on.
> What version of trunk are you using?
> -Yonik
> - Lucene/Solr Open Source Search Conference.
> Boston May 7-10

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