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https://issues.apache.org/jira/browse/HDFS-15623?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17219841#comment-17219841
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Hector Sandoval Chaverri commented on HDFS-15623:
-------------------------------------------------

[Pull Request #2403|https://github.com/apache/hadoop/pull/2403] updates 
{{RPC.setProtocolEngine()}} to prevent configured values of {{rpc.engine}} from 
being overwritten. With the new behavior, we can use implementations of 
{{RpcEngine}} other than the default ({{ProtobufRpcEngine2}}) by specifying 
them in the Configuration (e.g. {{core-default.xml}}).

> Respect configured values of rpc.engine
> ---------------------------------------
>
>                 Key: HDFS-15623
>                 URL: https://issues.apache.org/jira/browse/HDFS-15623
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: hdfs
>            Reporter: Hector Sandoval Chaverri
>            Priority: Major
>              Labels: pull-request-available
>          Time Spent: 20m
>  Remaining Estimate: 0h
>
> The HDFS Configuration allows users to specify the RPCEngine implementation 
> to use when communicating with Datanodes and Namenodes. However, the value is 
> overwritten to ProtobufRpcEngine.class in different classes. As an example in 
> NameNodeRpcServer:
> {{RPC.setProtocolEngine(conf, ClientNamenodeProtocolPB.class, 
> ProtobufRpcEngine.class);}}
> {{The configured value of rpc.engine.[protocolName] should be respected to 
> allow for other implementations of RPCEngine to be used}}



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