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https://issues.apache.org/jira/browse/SOLR-7191?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14354379#comment-14354379
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Damien Kamerman commented on SOLR-7191:
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I tested 4,000 cores on branch_5x and found better results. My setup:
3 nodes (32GB RAM each ; jdk1.8.0_40) running on a single server (256GB RAM).
2,000 collections (1 x shard ; 2 x replica)
1 x Zookeeper 3.4.6
Full restart (stop all nodes; start all nodes 1min staggered). Many cores on
node1 are active, other cores are recovering. Lots of warnings
'org.apache.solr.update.PeerSync; no frame of reference to tell if we've missed
updates' on node2 and node3. But it is slowly recovering.
BTW: collection creation slows down the more collections you have in the cloud.
Starts with qtimes of ~3s; ending with ~6s. Solr 4.x was always steady at ~3s.
> 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
> Labels: performance, scalability
> Attachments: 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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