[jira] Created: (HDFS-928) Ability to provide custom DatanodeProtocol implementation

[Zlatin Balevsky (JIRA)]

Ability to provide custom DatanodeProtocol implementation
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                 Key: HDFS-928
                 URL: https://issues.apache.org/jira/browse/HDFS-928
             Project: Hadoop HDFS
          Issue Type: Wish
          Components: data-node
            Reporter: Zlatin Balevsky
            Priority: Trivial


This should make testing easier as well as allow users to provide their own 
RPC/namenode implementations.  It's pretty straightforward:

1. add 
interface DatanodeProtocolProvider {
  DatanodeProtocol getNameNode(Configuration conf);
}

2. add a config setting like "dfs.datanode.protocol.impl"

3. create a default implementation and copy/paste the RPC initialization code 
there

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