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


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how to execute different tasks on data nodes(simultaneously in hadoop).
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.

thanks in advance.