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https://issues.apache.org/jira/browse/ZOOKEEPER-1787?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13790718#comment-13790718
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Thawan Kooburat commented on ZOOKEEPER-1787:
--------------------------------------------

Your original patch is to add 4lw comment to disable session validation on the 
leader right? If you could try my approach, I think the patch should be much 
smaller. 

> Add support enabling local session in rolling upgrade
> -----------------------------------------------------
>
>                 Key: ZOOKEEPER-1787
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1787
>             Project: ZooKeeper
>          Issue Type: Bug
>          Components: server
>    Affects Versions: 3.5.0
>            Reporter: Thawan Kooburat
>            Priority: Minor
>
> Currently, local session need to be enable by stopping the entire ensemble. 
> If a rolling upgrade is used, all write request from a local session will 
> fail with session move until the local session is enabled on the leader.



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