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https://issues.apache.org/jira/browse/YARN-6142?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ray Chiang resolved YARN-6142.
------------------------------
       Resolution: Information Provided
    Fix Version/s: 3.0.0

Protobuf and JACC analysis done.  Will continue rolling upgrade reviews at 
HDFS-11096.

> Support rolling upgrade between 2.x and 3.x
> -------------------------------------------
>
>                 Key: YARN-6142
>                 URL: https://issues.apache.org/jira/browse/YARN-6142
>             Project: Hadoop YARN
>          Issue Type: Task
>          Components: rolling upgrade
>    Affects Versions: 3.0.0-alpha2
>            Reporter: Andrew Wang
>            Assignee: Ray Chiang
>            Priority: Blocker
>             Fix For: 3.0.0
>
>
> Counterpart JIRA to HDFS-11096. We need to:
> * examine YARN and MR's  JACC report for binary and source incompatibilities
> * run the [PB 
> differ|https://issues.apache.org/jira/browse/HDFS-11096?focusedCommentId=15816405&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-15816405]
>  that Sean wrote for HDFS-11096 for the YARN PBs.
> * sanity test some rolling upgrades between 2.x and 3.x. Ideally these are 
> automated and something we can run upstream.



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