Make the Client-Datanode streaming protocol concrete
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Key: HADOOP-4008
URL: https://issues.apache.org/jira/browse/HADOOP-4008
Project: Hadoop Core
Issue Type: Sub-task
Reporter: Sanjay Radia
The Client-Datanode streaming protocol is a set of message exchanges.
The messages are not concrete data type s(ie it is not classes or interfaces).
The message exchange could be made concrete by declaring message data types
and/or interfaces.
This will help future automated versioning via protocol-buffers style approach.
It will also help document the interface and can simplify the code.
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