Its performance had a significant impact on our decision making as well. It sustains an enormous number of writes and the read cycle times were much better than we had anticipated. Further, it gives us the option to interact with the Hadoop Ecosystem, including HDFS, Mapreduce, and Zookeeper frameworks. Our enthusiasm for HBase skyrocketed when we discovered how to create map-reduce apps to do a number of management tasks. While Cassandra also has these capabilities, its data model was fundamentally more complex.
via NoSQL databases