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- A map task receives a blockID n as a key, and two submatrices as its value
- Reduce task computes sum of blocks
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Find the maximum absolute row sum of matrix
- https://issues.apache.org/jira/browse/HAMA-171
- A map task receives a row n as a key, and vector as its value
- emit (row, the sum of the absolute value of each entries)
- Reduce task selects the maximum one
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