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From Sharad Agarwal <shara...@yahoo-inc.com>
Subject Re: upgrades and old clients
Date Thu, 20 Nov 2008 12:31:39 GMT

> 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 
core-dev@hadoop.apache.org with subject ""Hadoop 1.0 Compatibility 

Also, this might help:

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