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.
