how to control map and reduce tasks manually...?

[dkvp21 <dk...@gmail.com>]

hi, all~!

I have some questions. Please help me.

I want to know how to control map and reduce tasks manually.

I mean I want to execute a map phase only, and then I want to execute a
reduce phase.


And is it possible to execute the map phase again using the same input data?

That is, I want to use mapreduce system for task parallel computation.


Finally, is there shared memory between mappers?


If you know, please let me know.

Thanks~! :)

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