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https://issues.apache.org/jira/browse/HADOOP-9944?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13762118#comment-13762118
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Daryn Sharp commented on HADOOP-9944:
-------------------------------------

There are multiple negative callIds to signal out of band operations, such as 
ping and sasl.  Is the intention to change the protobuf def to a signed int?
                
> 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
>            Priority: Blocker
>
> RpcRequestHeaderProto defines callId as uint32 while 
> ipc.Client.CONNECTION_CONTEXT_CALL_ID is signed (-3).

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