Shawn Heisey created SOLR-7191:
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             Summary: 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


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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