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From Markus Jelsma <markus.jel...@openindex.io>
Subject RE: High CPU DistributedQueue and OverseerAutoReplicaFailoverThread
Date Wed, 12 Aug 2015 09:30:25 GMT
Hi - anyone to share some hints on the topic?

Regards,
M. 
 
-----Original message-----
> From:Markus Jelsma <markus.jelsma@openindex.io>
> Sent: Wednesday 5th August 2015 12:13
> To: solr-user <solr-user@lucene.apache.org>
> Subject: High CPU DistributedQueue and OverseerAutoReplicaFailoverThread
> 
> Hello  - we have a single Solr 5.2.1 node that (for now) contains four single shard
collections. Only two collections actually contain data and are queried. The machine has some
unusual latency that led me to sample the CPU time with VisualVM. On that node we see that
DistributedQueue$LatchWachter.await() and OverseerAutoReplicaFailoverThread() claiming a lot
of CPU time, DistributedQueue takes the most of it. I have set logging to DEBUG but no Zookeeper
logging is printed, the connections are stable and updates rarely come in. 
> 
> Is it because the node runs the overseer? If so, how can i prevent it from taking quite
a lot of CPU time on a node with four collections where no state changes occur?
> 
> Any other thoughts?
> Markus
> 

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