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How can I repeat the map and reduce process and feed the output of reduce into map function (in the next round)?

My second question is how to define a global variable with is accessible among all map and reduce funtions?

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This might be more of a programming question suited for stackoverflow.com. – usul Dec 4 '12 at 22:41
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I don't understand the question, it's awfully vague. What exactly are you trying to do? Maybe you should explain what you want to compute and where you're stuck. – Gilles♦ Dec 4 '12 at 23:01
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I'm a Stack Overflow moderator. Topically, this would be a better fit for Stack Overflow, and you're welcome to ask it there provided that you list more details and (preferably) show code you've tried which does not work. This wasn't migrated because it would quickly be closed as-is, which wouldn't be a good experience for you. – Tim Post♦ Dec 6 '12 at 10:31

closed as off topic by Merbs, Luke Mathieson, Ran G., Raphael♦ Dec 6 '12 at 10:25

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1 Answer

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You can try using ChainMapper and ChainReducer to create a job pattern like 

[MAP+ / REDUCE MAP*]
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