1. HadoopDB
2. Aster Data Systems Inc. In-Database MapReduce for Rich Analytics; http://www.asterdata.com/product/mapreduce.php. Aster Data Systems Inc. In-Database MapReduce for Rich Analytics ; http://www.asterdata.com/product/mapreduce.php.
3. Dewitt D. and Stonebraker M. MapReduce: A Major Step Backwards blogpost; http://databasecolumn.vertica.com/database-innovation/mapreduce-a-major-step-backwards/ Dewitt D. and Stonebraker M. MapReduce: A Major Step Backwards blogpost; http://databasecolumn.vertica.com/database-innovation/mapreduce-a-major-step-backwards/