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https://issues.apache.org/jira/browse/HADOOP-17680?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17338697#comment-17338697
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Konstantin Shvachko commented on HADOOP-17680:
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There isn't much you can do about existing constructors.
+1 for the latest patch.
> Allow ProtobufRpcEngine to be extensible
> ----------------------------------------
>
> Key: HADOOP-17680
> URL: https://issues.apache.org/jira/browse/HADOOP-17680
> Project: Hadoop Common
> Issue Type: Improvement
> Components: common
> Reporter: Hector Sandoval Chaverri
> Priority: Major
> Labels: pull-request-available
> Time Spent: 1h 10m
> Remaining Estimate: 0h
>
> 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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