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From Charlie Hull <>
Subject Re: Solr Cloud has lower performance with more servers
Date Thu, 09 Oct 2014 14:37:11 GMT
On 09/10/2014 14:06, Yannick wrote:
> Hello good Solr people,
> I have the following surprising situation.
> I created a group of 2 Solr servers with a load-balancer in front
> (Haproxy). I have a batch client that sends requests (read-only)
> continuously to the load-balancer. The problem is: the performance is
> slower with 2 servers than it is with a single server (still via the
> load-balancer, with the second server down, so it's not the
> load-balancer itself causing the slowdown). My batch execution time
> is about 5 minutes with a single server, and more than 6 minutes with
> two servers.

What sort of queries are you doing? We're seeing some interesting 
effects of distributed facet queries with a current client - it seems 
there are some unexpected uses of caches.

> Both servers are VMs, hosted on two different physical computers,
> with no resource sharing. I tried throwing in a third server, the
> performance was even lower.
> I'm trying to find ideas on what could cause this and/or what else I
> could try? My goal is to decrease the execution times of these
> batches (which may last for many hours), but this clearly seems to be
> going the wrong way.
> Thanks in advance,
> Yann

Charlie Hull
Flax - Open Source Enterprise Search

tel/fax: +44 (0)8700 118334
mobile:  +44 (0)7767 825828

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