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http://wiki.apache.org/hama/Architecture

* https://issues.apache.org/jira/browse/HAMA154
=== Dense MatrixMatrix multiplication ===
 To mutliply two dense matrices A and B, We collect the blocks to 'collectionTable' firstly
using map/reduce. Rows are named as c(i, j) with sequential number ((N^2 * i) + ((j * N) +
k) to avoid duplicated records.
+ To mutliply two dense matrices A and B, We collect the blocks to 'collectionTable' firstly
using map/reduce. Rows are named as c(i, j) with sequential number ((N^2 * i) + ((j * N) +
k) to avoid duplicated records.
{{{
CollectionTable:
@@ 60, +60 @@
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, subvector)
+  emit (blockID, subvector) pairs
 Reduce task merges block structures based on the information of blockID
Multiplication job:
