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https://issues.apache.org/jira/browse/YARN-6142?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16213251#comment-16213251
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Ray Chiang commented on YARN-6142:
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I'm done with the JACC analysis, but need to do the same type of writeup that
was done for protobuf.
The quick answer is that we don't have any major red flags, but I'm going to
note some potential incompatibilities that are very minor, but could affect
some random API user out there.
> 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
>
> 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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