[YARN-3292] [Umbrella] Tests/documentation and/or tools for YARN rolling upgrades backwards/forward compatibility verification - ASF JIRA

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Type: Improvement
Status: Open
Priority: Major
Resolution: Unresolved
Affects Version/s: None
Fix Version/s: None
Component/s: None
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Description

~~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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YARN-666 [Umbrella] Support rolling upgrades in YARN

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1.	Implement a protobuf compatibility checker to check if a patch breaks the compatibility with existing client and internal protocols	Open	Li Lu	Actions
2.	Add protobuf compatibility checker to jenkins test runs	Open	Li Lu	Actions
3.	Add jdiff support to YARN	Closed	Li Lu	Actions