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How to change topology

I know that DataNode and TaskTracker must restart to change topology.
Is there the method to execute the topology change without restart of
DataNode and TaskTracker?
In other words, can I change the topology by a command?

Thanks in advance!
Steve Loughran 2012-10-09, 08:22
Steve Loughran 2012-10-09, 19:17
Ted Dunning 2012-10-09, 19:31
Shinichi Yamashita 2012-10-10, 15:19