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https://issues.apache.org/jira/browse/HDFS-11096?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrew Wang reassigned HDFS-11096:
----------------------------------

    Assignee: Sean Mackrory  (was: Lei (Eddy) Xu)

> Support rolling upgrade between 2.x and 3.x
> -------------------------------------------
>
>                 Key: HDFS-11096
>                 URL: https://issues.apache.org/jira/browse/HDFS-11096
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: rolling upgrades
>    Affects Versions: 3.0.0-alpha1
>            Reporter: Andrew Wang
>            Assignee: Sean Mackrory
>            Priority: Blocker
>
> trunk has a minimum software version of 3.0.0-alpha1. This means we can't 
> rolling upgrade between branch-2 and trunk.
> This is a showstopper for large deployments. Unless there are very compelling 
> reasons to break compatibility, let's restore the ability to rolling upgrade 
> to 3.x releases.



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