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The following page has been changed by udanax:
http://wiki.apache.org/hama/Architecture

Multiplication job:
 A map task receives a blockID n as a key, and two submatrices of A and B as its value
+  Multiply two submatrices: a[i][j] * b[j][k]
  Reduce task computes sum of blocks
+  Reduce task computes sum of blocks
+  c[i][k] += multiplied blocks
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 ''If A stored on Hbase and we collect the B to A, Can we reduce the run time of blocking
job. Edward ''
