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MapReduce, mail # user - new join algorithm using mapreduce

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new join algorithm using mapreduce
Vikas Jadhav 2013-01-19, 17:28
I am writing new join algorithm using hadoop
and want to do multi way join in single mapreduce job
map --> processes all dataset
reduce-->  join of all dataset
                + aggregate operation

second mapreduce job

will collect result from multple reducer files of first job

I am pretty clear about map phase but dnt have idea how to process
all dataset in single reduce.

So how i should proceed and
do i need to modify code of mapreduce


Thanx and Regards*
* Vikas Jadhav*