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From "Yoram Arnon (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-252) add versioning to RPC
Date Wed, 24 May 2006 22:38:29 GMT
add versioning to RPC

         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

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