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HBase >> mail # user >> MapReduce: Reducers partitions.

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MapReduce: Reducers partitions.

quick question. How are the data from the map tasks partitionned for
the reducers?

If there is 1 reducer, it's easy, but if there is more, are all they
same keys garanteed to end on the same reducer? Or not necessary?  If
they are not, how can we provide a partionning function?