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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) pairs
- 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
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