large scale data processing Hbase > Cassandra
I am nearly landed at Cassandra after my research on large scale data storage solutions. But its generally said that Hbase is better solution for large scale data processing and analysis. 

While both are same key/value storage and both are/can run (Cassandra recently) Hadoop layer then what makes Hadoop a better candidate when processing/analysis is required on large data.

I also found good details about both at
http://ria101.wordpress.com/2010/02/24/hbase-vs-cassandra-why-we-moved/ 

but still looking for concrete reasons for the superiority of Hbase.

While I am more convinced about Cassandra because its simplicity for adding nodes and seamless replication and no point of failure features. And it also keeps secondary index feature so its a good plus.
large scale data processing Hbase > Cassandra
===

I am nearly landed at Cassandra after my research on large scale data storage solutions. But its generally said that Hbase is better solution for large scale data processing and analysis. 

While both are same key/value storage and both are/can run (Cassandra recently) Hadoop layer then what makes Hadoop a better candidate when processing/analysis is required on large data.

I also found good details about both at
http://ria101.wordpress.com/2010/02/24/hbase-vs-cassandra-why-we-moved/ 

but still looking for concrete reasons for the superiority of Hbase.

While I am more convinced about Cassandra because its simplicity for adding nodes and seamless replication and no point of failure features. And it also keeps secondary index feature so its a good plus.