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https://issues.apache.org/jira/browse/ZOOKEEPER-2016?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14136346#comment-14136346
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Alexander Shraer commented on ZOOKEEPER-2016:
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oh right, that's it. So its not a callback that will be executed after - both 
are before the call to updateServerList. One is for what to do before such as 
waiting, the other is for taking a connection string (based on getConfig's 
response) and potentially changing it. The new returned connection string is 
then passed to updateServerList. 
How does that sound ?

> Automate client-side rebalancing
> --------------------------------
>
>                 Key: ZOOKEEPER-2016
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2016
>             Project: ZooKeeper
>          Issue Type: Improvement
>            Reporter: Hongchao Deng
>            Assignee: Hongchao Deng
>         Attachments: ZOOKEEPER-2016.patch, draft-2.patch, draft-3.patch, 
> draft.patch
>
>
> 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.
> Reviewboard: https://reviews.apache.org/r/25599/



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