It's unnecessary to run the NN and JT daemons on separate machines in small clusters with more than three nodes. You'll only have performance benefits by putting these daemons on separate machines if you have a large (100s of nodes) cluster. It makes sense to separate the NN and JT daemons in a three node cluster as well, assuming each node is a DataNode and TaskTracker as well.
Hope this clears things up. Alex On Fri, Jul 3, 2009 at 3:37 AM, calikus <[email protected]> wrote: > > Hi, > > I wonder which is better, Namenode and JobTracker run in different server > or > not? > > > -- > View this message in context: > http://www.nabble.com/Wich-is-better-Namenode-and-JobTracker-run-in-different-server-or-not--tp24321039p24321039.html > Sent from the Hadoop core-user mailing list archive at Nabble.com. > >
