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https://issues.apache.org/jira/browse/SOLR-6629?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17903977#comment-17903977
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David Smiley commented on SOLR-6629:
------------------------------------

A voice from the future and from a fork of SolrCloud:  It's not necessary that 
any node watch for collections coming into (or out of) existence.  It doesn't 
scale with high collection counts, and it adds complexity as well.

> Watch /collections zk node on all nodes
> ---------------------------------------
>
>                 Key: SOLR-6629
>                 URL: https://issues.apache.org/jira/browse/SOLR-6629
>             Project: Solr
>          Issue Type: Improvement
>          Components: SolrCloud
>            Reporter: Shalin Shekhar Mangar
>            Assignee: Shalin Shekhar Mangar
>            Priority: Major
>             Fix For: 5.4, 6.0
>
>         Attachments: SOLR-6629-new.patch, SOLR-6629.patch, SOLR-6629.patch, 
> SOLR-6629.patch, SOLR-6629.patch, SOLR-6629.patch
>
>
> The main clusterstate.json is refreshed/used as a poor substitute for 
> informing all nodes about new or deleted collections even when the collection 
> being created or deleted has state format > 1. When we move away from state 
> format 1 then we should do away with this workaround and start watching the 
> /collections zk node on all nodes.



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