Junping Du commented on YARN-2278:

"version = RPC.getProtocolVersion(protocolPB) + 1;"
This is for test purpose as I mentioned above. I would expect a "version 
mismatch" exception is thrown out like what we did at HADOOP-10729, but didn't 
run to it.

> YARN RPC should support Protocol Version in client/server
> ---------------------------------------------------------
>                 Key: YARN-2278
>                 URL: https://issues.apache.org/jira/browse/YARN-2278
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>    Affects Versions: 2.4.1
>            Reporter: Junping Du
>            Assignee: Junping Du
>         Attachments: YARN-2278-demo.patch
> Currently in HadoopYarnProtoRPC.java, we are put a fix version number (1) in 
> getting client proxy.
> {code}
> return RpcFactoryProvider.getClientFactory(conf).getClient(protocol, 1, addr, 
> conf);
> {code}
> In rolling-upgrade scenario, it is possible that the client and server of 
> YARN components could in different versions. We should fix this with getting 
> version number from ProtocolPB (ProtocolInfo annotation) as HDFS already did.

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