Kai Zheng commented on MAPREDUCE-6706:

Hi [~djp],

Thanks for your feedback in time and it's very helpful. As you could see in the 
discussions in HADOOP-12579, it's regarded as a burden to maintain the old RPC 
engine, so in my understanding if we can remove it in the code base without 
being concerned it'd be great, so that's why I want to proceed on this. Sure if 
it incurs too much overhead or effort to switch the engine like here, I'd like 
to stop and just have the old engine deprecated other than removal.

> Update TaskUmbilicalProtocol to use ProtobufRPCEngine
> -----------------------------------------------------
>                 Key: MAPREDUCE-6706
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-6706
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>            Reporter: Arun Suresh
>            Assignee: Wei Zhou
> Currently, {{TaskUmbilicalProtocol}} still uses {{WritableRPCEngine}}, which 
> should be moved to {{ProtocolRPCEngine}} so that the former can be deprecated 
> as tracked by HADOOP-12579

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