Thus spake lohit::
It depends on your machine configuration, how much resource it has and
what you can afford to lose in case of failures.
It would be good to run NameNode and jobtracker on their own dedicate
nodes and datanodes and tasktracker on rest of the nodes. We have seen
cases where tasktrackers take down nodes for malicious programs, in such
cases you do not want your jobtracker or namenode to be on those nodes.
Also, running multiple jvms might slow down the node and your process. I
would recommend you run atleast the NameNode on dedicated node.
Thanks,
Lohit
Good to know; thank you.
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