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From "Jack Krupansky" <>
Subject Re: Advise on an architecture with lot of cores
Date Tue, 07 Oct 2014 13:12:07 GMT
You'll have to do a proof of concept test to determine how many collections 
Solr/SolrCloud can handle.

With a very large number of customers you may have to do sharding of the 
clusters themselves - limit each cluster to however many 
customers/colllections work well (100? 250?) and then have separate clusters 
for larger groups of customers, maybe with a smaller cluster with a 
collection that maps the customer ID to a Solr cluster, and then the 
application layer can direct requests to the Solr cluster that owns that 

-- Jack Krupansky

-----Original Message----- 
From: Manoj Bharadwaj
Sent: Tuesday, October 7, 2014 8:27 AM
Subject: Advise on an architecture with lot of cores

Hi folks,

My team inherited a SOLR setup with an architecture that has a core for
every customer. We have a few different types of cores, say "A", "B", C",
and for each one of this there is a core per customer - namely "A1",
"A2"..., "B1", "B2"... Overall we have over 600 cores. We don't know the
history behind the current design - the exact reasons why it was done the
way it was done - one probable consideration was to ensure a customer data
separate from other.

We want to go to a single core per type architecture, and move on to  SOLR
cloud as well in near future to achieve sharding via the features cloud

Further aspects such as monitoring become easier as well. We will need to
watch and tune the caches for the different pattern of hits that we see.

Is there anything else to evaluate before we move to a single core per type

We are using 4.4.0 currently and will be moving to latest 4.10.1 as a part
of the redesign as well.


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