Best explanation of Cassandra vs MondoDB: Why I may switch to MongoDB for better R support? Redis is less popular
Benefits of Cassandra with Sharding:
Clients to Mongo including R (better R client support for MondoDB as compared to Cassandra)
2 potential R package client repositories for MongoDB
MongoDB does still do sharding:
This is a primary reasons why I would switch from Redis. An example of usage of R with MongoDB using high frequency market data:
There are many other examples found on R-Bloggers.com
NOTE I now post my TRADING ALERTS into my personal FACEBOOK ACCOUNT and TWITTER. Don't worry as I don't post stupid cat videos or what I eat!