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https://issues.apache.org/jira/browse/ZOOKEEPER-2016?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14106028#comment-14106028
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Alexander Shraer commented on ZOOKEEPER-2016:
---------------------------------------------

IIRC watch notifications are done by the follower to which a client is 
connected, not by leader. Even if we're talking about a few hundreds clients 
per server I'm not sure its a problem for the server.

> Automate client-side rebalancing
> --------------------------------
>
>                 Key: ZOOKEEPER-2016
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2016
>             Project: ZooKeeper
>          Issue Type: Improvement
>            Reporter: Hongchao Deng
>
> ZOOKEEPER-1355 introduced client-side rebalancing, which is implemented in 
> both the C and Java client libraries. However, it requires the client to 
> detect a configuration change and call updateServerList with the new 
> connection string (see reconfig manual). It may be better if the client just 
> indicates that he is interested in this feature when creating a ZK handle and 
> we'll detect configuration changes and invoke updateServerList for him 
> underneath the hood.



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