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https://issues.apache.org/jira/browse/HDFS-2660?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13168603#comment-13168603
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Doug Cutting commented on HDFS-2660:
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> In order to support Avro, the right way to do it is, change the getServer()
> calls and addProtocol() calls to use WireProtocol and no longer just setting
> the RPC engine.
What do you mean by WireProtocol here? The protobuf-generated Java interface?
That contains, e.g., fields that are not meant to be transmitted but are not
declared transient. In other words, it's not a very good specification of a
wire protocol.
Avro actually includes code that knows how to serialize protobuf structs but
doesn't yet include protobuf-specific code for protocols
(http://s.apache.org/MZT). That could be added so that protobuf becomes the
'serialization-independent' Hadoop protocol specification instead of using Java
interfaces as we have before. I'd welcome that contribution to Avro. Then
RPCEngine might then be modified to accept protobuf ServiceDescriptors to
specify protocols rather than Java interfaces. Or we could abandon
serialization-independent RPC as an architectural goal and remove the code
related to it.
> Turn off TestDFSOverAvroRpc
> ---------------------------
>
> Key: HDFS-2660
> URL: https://issues.apache.org/jira/browse/HDFS-2660
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: test
> Reporter: Suresh Srinivas
> Assignee: Suresh Srinivas
> Fix For: 0.24.0
>
> Attachments: HDFS-2660.patch, HDFS-2660.txt
>
>
> With HDFS-2647, protobuf based RPCs are enabled for some of the protocol.
> With this, Avro RPC based protocol is not working. Avro based RPC needs to be
> turned on similar to how protobuf based RPCs are done. Until such a time, I
> propose turning off the test.
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