So I was wondering how hard it would be to make the RPC mechanism that the clients communicate on able to talk >2< versions of the protocol. 'N' and 'N-1' so that we could upgrade the cluster, and slowly upgrade the clients, possibly even on a secondary port.you might want to look at the mail thread sent to [email protected] with subject ""Hadoop 1.0 Compatibility Discussion"
Also, this might help: http://wiki.apache.org/hadoop/Release1.0Requirements
