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https://issues.apache.org/jira/browse/SOLR-7191?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14368557#comment-14368557
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Damien Kamerman commented on SOLR-7191:
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Shalin, Another change I made was to cache ConfigSetService.createIndexSchema() 
in cloud mode. BTW, have tested OK up to 24K cores.

> Improve stability and startup performance of SolrCloud with thousands of 
> collections
> ------------------------------------------------------------------------------------
>
>                 Key: SOLR-7191
>                 URL: https://issues.apache.org/jira/browse/SOLR-7191
>             Project: Solr
>          Issue Type: Bug
>          Components: SolrCloud
>    Affects Versions: 5.0
>            Reporter: Shawn Heisey
>            Assignee: Shalin Shekhar Mangar
>              Labels: performance, scalability
>         Attachments: SOLR-7191.patch, SOLR-7191.patch, SOLR-7191.patch, 
> lots-of-zkstatereader-updates-branch_5x.log
>
>
> A user on the mailing list with thousands of collections (5000 on 4.10.3, 
> 4000 on 5.0) is having severe problems with getting Solr to restart.
> I tried as hard as I could to duplicate the user setup, but I ran into many 
> problems myself even before I was able to get 4000 collections created on a 
> 5.0 example cloud setup.  Restarting Solr takes a very long time, and it is 
> not very stable once it's up and running.
> This kind of setup is very much pushing the envelope on SolrCloud performance 
> and scalability.  It doesn't help that I'm running both Solr nodes on one 
> machine (I started with 'bin/solr -e cloud') and that ZK is embedded.



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