Add RPC metrics to ProtobufRpcEnginer
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Key: HADOOP-8085
URL: https://issues.apache.org/jira/browse/HADOOP-8085
Project: Hadoop Common
Issue Type: Improvement
Components: ipc, metrics
Affects Versions: 0.24.0, 0.23.2
Reporter: Suresh Srinivas
Assignee: Suresh Srinivas
ProtobufRpcEngine is missing the RPC metrics compared to WritableRpcEngine. It
is important information for monitoring the cluster and understanding the
server performance.
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