Allen Wittenauer commented on YARN-3330:

This shouldn't be yarn specific.  I'd HIGHLY recommend bumping this up to a 
full issue into the HADOOP project so that:

a) goes into common

b) has higher visibility

> Implement a protobuf compatibility checker to check if a patch breaks the 
> compatibility with existing client and internal protocols
> -----------------------------------------------------------------------------------------------------------------------------------
>                 Key: YARN-3330
>                 URL: https://issues.apache.org/jira/browse/YARN-3330
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>            Reporter: Li Lu
>            Assignee: Li Lu
>         Attachments: pdiff_patch.py
> Per YARN-3292, we may want to start YARN rolling upgrade test compatibility 
> verification tool by a simple script to check protobuf compatibility. The 
> script may work on incoming patch files, check if there are any changes to 
> protobuf files, and report any potentially incompatible changes (line 
> removals, etc,.). We may want the tool to be conservative: it may report 
> false positives, but we should minimize its chance to have false negatives. 

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