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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