[jira] [Created] (HDFS-15912) Allow ProtobufRpcEngine to be extensible

["Hector Sandoval Chaverri (Jira)" <ji...@apache.org>]

Hector Sandoval Chaverri created HDFS-15912:
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             Summary: Allow ProtobufRpcEngine to be extensible
                 Key: HDFS-15912
                 URL: https://issues.apache.org/jira/browse/HDFS-15912
             Project: Hadoop HDFS
          Issue Type: Improvement
          Components: hdfs
            Reporter: Hector Sandoval Chaverri


The ProtobufRpcEngine class doesn't allow for new RpcEngine implementations to extend some of its inner classes (e.g. Invoker and Server.ProtoBufRpcInvoker). Also, some of its methods are long enough such that overriding them would result in a lot of code duplication (e.g. Invoker#invoke and Server.ProtoBufRpcInvoker#call).

When implementing a new RpcEngine, it would be helpful to reuse most of the code already in ProtobufRpcEngine. This would allow new fields to be added to the RPC header or message with minimal code changes.



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