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From Steve Loughran <ste...@apache.org>
Subject Re: Re-Addressing a cluster
Date Mon, 11 May 2009 10:07:22 GMT
jason hadoop wrote:
> You should be able to relocate the cluster's IP space by stopping the
> cluster, modifying the configuration files, resetting the dns and starting
> the cluster.
> Be best to verify connectivity with the new IP addresses before starting the
> cluster.
> 
> to the best of my knowledge the namenode doesn't care about the ip addresses
> of the datanodes, only what blocks they report as having. The namenode does
> care about loosing contact with a connected datanode,  replicating the
> blocks that are now under replicated.
> 
> I prefer IP addresses in my configuration files but that is a personal
> preference not a requirement.


I do deployments on to Virtual clusters without fully functional reverse 
DNS, things do work badly in that situation. Hadoop assumes that if a 
machine looks up its hostname, it can pass that to peers and they can 
resolve it, the "well managed network infrastructure" assumption.

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