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Blocking jobs: Collect the blocks to 'collectionTable' from A and B. - A map task receives a row n as a key, and vector of each row as its value - emit (blockID, sub-vector) - Reduce task merges block structures based on the information of blockID Multiplication job: - A map task receives a blockID n as a key, and two sub-matrices of A and B as its value - Reduce task computes sum of blocks |
– If A stored on Hbase and we collect the B to A, we can reduce once the mapreduce job --Edward
Find the maximum absolute row sum of matrix
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