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https://issues.apache.org/jira/browse/ZOOKEEPER-1787?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Raul Gutierrez Segales updated ZOOKEEPER-1787:
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    Attachment: ZOOKEEPER-1787.patch

With this patch you can use -Dzookeeper.skipSessionValidation=yes to enable 
local sessions with a rolling upgrade. We should probably add some 
documentation as well - but lets agree on this patch first. 

> Add support for 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
>         Attachments: ZOOKEEPER-1787.patch
>
>
> 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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