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From Hendrik Haddorp <>
Subject Re: 700k entries in overseer q cannot addreplica or deletereplica
Date Tue, 22 Aug 2017 12:20:45 GMT
When Solr is stopped it did not cause a problem so far.
I cleared the queue also a few times while Solr was still running. That 
also didn't result in a real problem but some replicas might not come up 
again. In those case it helps to either restart the node with the 
replicas that are in state "down" or to remove the failed replica and 
then recreate it. But as said, clearing it when Solr is stopped worked 
fine so far.

On 22.08.2017 14:03, Jeff Courtade wrote:
> How does the cluster react to the overseer q entries disapeering?
> Jeff Courtade
> M: 240.507.6116
> On Aug 22, 2017 8:01 AM, "Hendrik Haddorp" <> wrote:
>> Hi Jeff,
>> we ran into that a few times already. We have lots of collections and when
>> nodes get started too fast the overseer queue grows faster then Solr can
>> process it. At some point Solr tries to redo things like leaders votes and
>> adds new tasks to the list, which then gets longer and longer. Once it is
>> too long you can not read out the data anymore but Solr is still adding
>> tasks. In case you already reached that point you have to start ZooKeeper
>> and the ZooKeeper client with and increased "jute.maxbuffer" value. I
>> usually double it until I can read out the queue again. After that I delete
>> all entries in the queue and then start the Solr nodes one by one, like
>> every 5 minutes.
>> regards,
>> Hendrik
>> On 22.08.2017 13:42, Jeff Courtade wrote:
>>> Hi,
>>> I have an issue with what seems to be a blocked up /overseer/queue
>>> There are 700k + entries.
>>> Solr cloud 6.x
>>> You cannot addreplica or deletereplica the commands time out.
>>> Full stop and start of solr and zookeeper does not clear it.
>>> Is it safe to use the zookeeper supplied to simple rmr the
>>> /overseer/queue ?
>>> Jeff Courtade
>>> M: 240.507.6116

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