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From Han Dong <handon...@gmail.com>
Subject Question about running hadoop on multiple nodes/cores
Date Mon, 25 Oct 2010 23:04:42 GMT

In running hadoop, is it possible to specify the number of computing nodes
to use? Or does hadoop automatically configures to run on different nodes?

For example, if I specify 12 map tasks to run, and there are a cluster of 12
computing nodes, will hadoop automatically run one map task per node, or
would it run 2 maps per node for 6 nodes, if it detects the node has a 2
core processor?

Thank You,
Han Dong

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