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HDFS, mail # user - how to execute different tasks on data nodes(simultaneously in hadoop).


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mallik arjun 2012-09-03, 16:19
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Re: how to execute different tasks on data nodes(simultaneously in hadoop).
Michael Segel 2012-09-03, 16:25
Not sure what you are trying to do...

You want to pass through the entire data set on all nodes where each node runs a single filter?

You're thinking is orthogonal to how Hadoop works.

You would be better off letting each node work on a portion of the data which is local to that node running the entire filter set.
On Sep 3, 2012, at 11:19 AM, mallik arjun <[EMAIL PROTECTED]> wrote:

> genrally in hadoop map function will be exeucted by all the data nodes on the input data set ,against this how can i do the following.
> i have some filter programs , and what i want to do is each data node(slave) has to execute one filter alogrithm  simultaneously, diffent from other data nodes executions.
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> thanks in advance.
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Bertrand Dechoux 2012-09-03, 16:31