Vinod Kumar Vavilapalli commented on YARN-3292:

+1, this will be super useful in successfully supporting YARN rolling upgrades!

> [Umbrella] Tests and/or tools for YARN backwards compatibility verification
> ---------------------------------------------------------------------------
>                 Key: YARN-3292
>                 URL: https://issues.apache.org/jira/browse/YARN-3292
>             Project: Hadoop YARN
>          Issue Type: Improvement
>            Reporter: Li Lu
>            Assignee: Li Lu
>              Labels: compatibility, rolling_upgrade, test, tools
> YARN-666 added the support to YARN rolling upgrade. In order to support this 
> feature, we made changes from many perspectives. There were many assumptions 
> made together with these existing changes. Future code changes may break 
> these assumptions by accident, and hence break the YARN rolling upgrades 
> feature. 
> To simplify YARN RU regression tests, maybe we would like to create a set of 
> tools/tests that can verify YARN RU backward compatibility. 
> On the very first step, we may want to have a compatibility checker for 
> important protocols and APIs. We may also want to incorporate these tools 
> into our test Jenkins runs, if necessary. 

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