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Hadoop >> mail # user >> force minimum number of nodes to run a job?


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force minimum number of nodes to run a job?
let's say my job can run on 4 mapper slots, but if there is only 1 slot
available,
I don't want them to run one by one, and have to wait till the time that at
least 4 slots are available.

is it possible to force hadoop to do this?

thanks!
yang