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https://issues.apache.org/jira/browse/SOLR-7191?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14354875#comment-14354875
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Shawn Heisey commented on SOLR-7191:
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Now that I look closer at that log snippet, it appears that was a state update
for node2, so I'm not sure exactly how long it took for node1 to become stable
... but since I started ndoe2 at 07:01 UTC, it appears that it was nearly half
an hour for full cluster stability, which is unacceptable in a production
situation.
There are no docs in any of the indexes, and I did not think to try a query or
an update to see whether Solr was actually functional. That will be included
on any test repeat.
> 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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