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From "Hairong Kuang (JIRA)" <j...@apache.org>
Subject [jira] Created: (HDFS-1329) A baby step towards inter-version communications between dfs client and NameNode
Date Mon, 02 Aug 2010 23:52:19 GMT
A baby step towards inter-version communications between dfs client and NameNode
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                 Key: HDFS-1329
                 URL: https://issues.apache.org/jira/browse/HDFS-1329
             Project: Hadoop HDFS
          Issue Type: New Feature
          Components: hdfs client
    Affects Versions: 0.22.0
            Reporter: Hairong Kuang
            Assignee: Hairong Kuang
             Fix For: 0.22.0


Currently RPC communications in Hadoop is very strict. If a client has a different version
from that of the server, a VersionMismatched exception is thrown and the client can not connect
to the server. This force us to update both client and server all at once if a RPC protocol
is changed. But sometime different versions do not mean the client & server are not compatible.
It would be nice if we could relax this restriction and allows us to support inter-version
communications.

My idea is that DfsClient catches VersionMismatched exception when it connects to NameNode.
It then checks if the client & the server is compatible. If yes, it sets the NameNode
version in the dfs client and allows the client to continue talking to NameNode. Otherwise,
rethrow the VersionMismatch exception.

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