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Matrix multiplication is common and important algebraic operation.While coming to MapReduce Paradigm, If we give 2 matrices for multiplication, once we get the data from HDFS and process them in map() we only get one input split.We cannot make sure which row is that. So butter way to do that is to order your data with row and column index.

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Matrix multiplication is applied to file of format:MatrixName,row,col,element

A,0,1,1.0
A,0,2,2.0
A,0,3,3.0
A,0,4,4.0
B,3,1,10.0
B,3,2,11.0
A,1,0,5.0
A,1,1,6.0
A,1,2,7.0
A,1,3,8.0
A,1,4,9.0
B,0,1,1.0
B,0,2,2.0
B,1,0,3.0
B,1,1,4.0
B,1,2,5.0
B,2,0,6.0
B,2,1,7.0
B,2,2,8.0
B,3,0,9.0
B,4,0,12.0
B,4,1,13.0
B,4,2,14.0

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