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https://issues.apache.org/jira/browse/HADOOP-9944?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13780431#comment-13780431
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Todd Lipcon commented on HADOOP-9944:
-------------------------------------

This patch made 2.1.1 wire-incompatible with 2.1.0. I thought were were 
supposed to stop making incompatible wire changes now that we're in beta? I 
guess it's too late to argue now that it's been released, but we should be 
clear on this policy, and we should also get some practice making sure our 
protobuf evolution is compatible now that we're in beta.
                
> RpcRequestHeaderProto defines callId as uint32 while 
> ipc.Client.CONNECTION_CONTEXT_CALL_ID is signed (-3)
> ---------------------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-9944
>                 URL: https://issues.apache.org/jira/browse/HADOOP-9944
>             Project: Hadoop Common
>          Issue Type: Bug
>            Reporter: Arun C Murthy
>            Assignee: Arun C Murthy
>            Priority: Blocker
>             Fix For: 2.1.1-beta
>
>         Attachments: HADOOP-9944.patch, HADOOP-9944.patch, HADOOP-9944.patch
>
>
> RpcRequestHeaderProto defines callId as uint32 while 
> ipc.Client.CONNECTION_CONTEXT_CALL_ID is signed (-3).

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