IMHO, any effort spent trying to squeeze a gain from rack awareness is a waste of time. High speed networks & Moore's Law pretty much make the notion obsolete faster than any benefit (if there is one) can catch up to.
Not an answer to your question though. I realize that. > What is the best way to change the rack of a node? > > I have tried the following: Killed the datanode process. Changed the > rackmap > file so the node && and ip address entry reflect the new rack and I do a > '-refreshNodes'. Restarted the datanode. But it seems the datanode is > keep > getting register to the old rack. > > -- > --- Get your facts first, then you can distort them as you please.-- >
