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From Michael Della Bitta <>
Subject Re: SolrCloud config question and zookeeper
Date Mon, 27 Oct 2014 14:41:43 GMT
You want external zookeepers. Partially because you don't want your Solr 
garbage collections holding up zookeeper availability, but also because 
you don't want your zookeepers going offline if you have to restart Solr 
for some reason.

Also, you want 3 or 5 zookeeepers, not 4 or 8.

On 10/27/14 10:35, Bernd Fehling wrote:
> While starting now with SolrCloud I tried to understand the sense
> of external zookeeper.
> Let's assume I want to split 1 huge collection accross 4 server.
> My straight forward idea is to setup a cloud with 4 shards (one
> on each server) and also have a replication of the shard on another
> server.
> server_1: shard_1, shard_replication_4
> server_2: shard_2, shard_replication_1
> server_3: shard_3, shard_replication_2
> server_4: shard_4, shard_replication_3
> In this configuration I always have all 4 shards available if
> one server fails.
> But now to zookeeper. I would start the internal zookeeper for
> all shards including replicas. Does this make sense?
> Or I only start the internal zookeeper for shard 1 to 4 but not
> the replicas. Should be good enough, one server can fail, or not?
> Or I follow the recommendations and install on all 4 server
> an external seperate zookeeper, but what is the advantage against
> having the internal zookeeper on each server?
> I really don't get it at this point. Can anyone help me here?
> Regards
> Bernd

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