Hi all, I am trying to perform matrix-vector multiplication using Hadoop. So I have matrix M in a file, and vector v in another file. How can I make it so that each Map task will get the whole vector v and a chunk of matrix M? Basically I want my map function to output key-value pairs (i,m[i,j]*v[j]), where i is the row number, and j the column number. And the reduce function will sum up all the values with the same key i, and that will be the ith element of my result vector. Or can you suggest another way to do it?
Thanks, Alexandra Anghelescu
