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

The matrix or network structure that frequently changes should have flexible storage structure
for easy update and indicies that point to the appropriate entry. Also, we need a model that
uses the concept of columniterative methods.
 Hama use a [http://hadoop.apache.org/hbase/ Hbase] to store the matrices. HBase is an opensource,
distributed, columnoriented store modeled.
+ HBase is an opensource, distributed, columnoriented store modeled as a google bigtable.
Hama uses [http://hadoop.apache.org/hbase/ Hbase] to store the matrices and graph which is
represented mathematically.
Matrices are basically tables. They are ways of storing numbers and other things. Typical
matrix has rows and columns which is often called a 2way matrix because it has two dimensions.
For example, you might have respondentsbyattitudes. Of course, you might collect the same
data on the same people at 5 points in time. In that case, you either have 5 different 2way
matrices, or you could think of it as a 3way matrix, that is respondentbyattitudebytime.
