Li Lu created YARN-3292:

             Summary: [Umbrella] Tests and/or tools for YARN backwards 
compatibility verification
                 Key: YARN-3292
             Project: Hadoop YARN
          Issue Type: Improvement
            Reporter: Li Lu
            Assignee: Li Lu

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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