Cassandra is a column oriented db, similar to bigtables data model and to hbase's data mode (although implementations differ)
hbase, btw, isn't a map-reduce implementation, you probably meant hadoop
In version 6 cassandra will add support for hadoop so it'll have mapr, but it's not the core of cassandra (current version is 5).

On Mon, Mar 1, 2010 at 12:26 PM, HHB <hubaghdadi@yahoo.ca> wrote:

Hey,
How Cassandra differs from MongoDB and CouchDB?
It seems to me that Cassandra looks like Map/Reduce implementation (like
HBase).
It is not a document based data base like MongoDB or CouchDB.
Am I right?
Thanks for help and time.
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