[jira] [Commented] (YARN-6142) Support rolling upgrade between 2.x and 3.x

["Andrew Wang (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/YARN-6142?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15852009#comment-15852009 ] 

Andrew Wang commented on YARN-6142:
-----------------------------------

I want to highlight a possible YARN issue that [~mackrorysd] found while working on HDFS-11096. We haven't gotten a response from a YARN person and it affects 2.8:

{quote}
For YARN (CC Karthik Kambatla), the field nodeLabels in several structures in yarn_protos changed from string to a custom type, and memory in ResourceProto change from int32 to int64 (not sure if it's the case in protobuf, but that may not be incompatible?)
{quote}

[~sunilg] / [~wangda], could you help check this as you worked on YARN-3583 where this change was made? I didn't see a compatibility discussion on that JIRA.

> 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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