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hadoop scheduler

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I want to implement a simple hadoop scheduler in java. I am new with Hadoop so when looking at oozie code I am getting lost.

I need a clean way to submit mapreduce job inside my code in the same way I am runing it on the command line/

for example, this command is used for caluclating PI on hadoop using the examples jar file provided with Cloudera.

bash-4.1$ /opt/cloudera/parcels/CDH-5.0.0-1.cdh5.0.0.p0.47/lib/hadoop-mapreduce/hadoop-mapreduce-examples.jar pi 2 1000

So I expact to find code that will take some configuration, jar file, main class and parameters for execution.

Thanks in advanced,
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