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Neil Williams 1be75fda0e tdb_cassandra: Add DenormalizedRelation infrastructure.

This is intended to replace Relation. Relation works by putting each individual
relationship in its own Row. This means that doing a fast_query (cross-product)
results in a large multiget that likely touches every node on the C* ring.
DenormalizedRelation instead puts all of the relationships into a single row
per thing1 and only fetches the desired columns on read. This means that most
of the time, we'll do a single-row lookup to determine what we want and the
majority of the time we will get a very fast response from the row-level bloom
filters indicating that no such relationship exists.

The row cache should be disabled for this column family as the rows will be
VERY wide.

2012-08-20 12:34:47 -07:00