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From Shawn Heisey <>
Subject Re: number of zookeeper & aws instances
Date Wed, 13 Apr 2016 15:48:48 GMT
On 4/13/2016 9:34 AM, Daniel Collins wrote:
> Just to chip in, more ZKs are probably only necessary if you are doing NRT
> indexing.
> Loss of a single ZK (in a 3 machine setup) will block indexing for the time
> it takes to get that machine/instance back up

That would NOT block indexing.  If you have three zookeepers and you
lose one, SolrCloud functionality will not change.  If you lose TWO,
then you would no longer be able to index.

If you've seen a situation where losing one zookeeper out of three
causes indexing to stop, then either something is not configured
correctly, or you've encountered a bug.  I would bet more on a
misconfiguration than a bug.

A 5-node ensemble would allow you to lose a server and still be able to
take down another server for maintenance, without affecting SolrCloud


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