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https://issues.apache.org/jira/browse/SOLR-7191?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14372212#comment-14372212
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Shalin Shekhar Mangar commented on SOLR-7191:
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bq. The biggest problem I noticed is that any little change on the cluster
(even creating a new collection) seems to cause a flood of ZkStateReader
"Updating data for XXXXX to ver NN" messages. Each time it must update every
single collection it has ... when that happens, it doesn't take an extreme
amount of time, but I've noticed that it does it repeatedly, especially on node
startup.
[~elyograg] -- Sorry for not responding earlier. Yes, that is how it works
right now. We didn't optimize this case because collections are created/deleted
infrequently. However, this might be a problem when users has collections with
statetFormat=1 and 2.
> 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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