add versioning to RPC
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Key: HADOOP-252
URL: http://issues.apache.org/jira/browse/HADOOP-252
Project: Hadoop
Type: Improvement
Components: ipc
Reporter: Yoram Arnon
currently, any change to any rpc message breaks the protocol, with mysterious
exceptions occurring at run time.
a versioning sceme would have two benefits:
- intelligent error messages, indicating that an upgrade is required
- backwards compatibility could be supported.
the proposal is to add a "const version" for each protocol, and a method: int
getVersion(int version) that sends the client's version and receives the
server's version. This would be the first method invoked on connection. Both
sides then either agree on the lowest version number, providing backwards
compatibility support, or abort the connection as "unsupported version".
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