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https://issues.apache.org/jira/browse/HADOOP-9619?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13675463#comment-13675463
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Todd Lipcon commented on HADOOP-9619:
-------------------------------------

One thing I think we should clarify: I don't think the .proto files themselves 
should be stable. Rather, the field IDs and types are stable -- ie we should 
not make any changes to the proto files which cause wire incompatibility. But 
we should feel free to rename the .proto files themselves, or change the 
annotations that affect code generation.

If a downstream project wants to use the Hadoop wire protocol, they should be 
making a _copy_ of the proto files for their use case, not assuming that we'll 
never rename a protobuf field (which is wire-compatible).
                
> Mark stability of .proto files
> ------------------------------
>
>                 Key: HADOOP-9619
>                 URL: https://issues.apache.org/jira/browse/HADOOP-9619
>             Project: Hadoop Common
>          Issue Type: Sub-task
>          Components: documentation
>            Reporter: Sanjay Radia
>            Assignee: Sanjay Radia
>


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