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https://issues.apache.org/jira/browse/SOLR-14389?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17076425#comment-17076425
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Houston Putman commented on SOLR-14389:
---------------------------------------

It's amazing to me that something like the solution mentioned ini "Rebalancing 
Client Connections" is not provided as a standard option within the Zookeeper 
client code. Anyways, we should write a class to support this. Maybe Curator 
will already have the functionality when we move to it, but that's a much 
longer term project.

> Support dynamic reconfiguration of Zookeeper ensemble
> -----------------------------------------------------
>
>                 Key: SOLR-14389
>                 URL: https://issues.apache.org/jira/browse/SOLR-14389
>             Project: Solr
>          Issue Type: Improvement
>      Security Level: Public(Default Security Level. Issues are Public) 
>          Components: SolrCloud
>            Reporter: Jan Høydahl
>            Priority: Major
>
> Spinoff from SOLR-14371.
> Zookeeper has got support for dynamic reconfiguration since v3.5 (See 
> https://zookeeper.apache.org/doc/r3.6.0/zookeeperReconfig.html). But users 
> need to actively start using it. Currently Solr treats the {{ZK_HOST}} var / 
> {{-DzkHost}} sysprop as a static truth, and will only ever attempt to connect 
> to the hosts originally included in the connection string.
> This issue aims to implement "Rebalancing Client Connections" as described in 
> last paragrah in above link. This will let sys admins extend or change their 
> ensemble, and Solr nodes will update and re-balance, as long as at least one 
> of the zk hosts are still in the static {{ZK_HOST}} list.



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