Big Analytics with R, Cassandra, and Hive
The R project is taking over the data world. With a plethora of algorithms at your fingertips it's not hard to see why R is such a powerful data analysis tool. I was fortunate enough to work with some of the original developers of the then S-Engine at bell labs out of college and even managed to write a few CRAN packages. In fact the ROracle package is now shipped with Oracle's big data appliance (who would have ever imagined!)
There has been a lot of work recently to integrate Hadoop with R by means of writing map/reduce in R. Most of the data scientists I've spoken to don't really want this, they really want ways to get data into R and use data sampling and other estimation techniques (for example hive sampling). This post will show how you can interact with Cassandra from R as well as with the Cassandra Hive Driver.
Reading data from Cassandra with JDBC
The example code assumes you have run through the Portfolio Manager Demo that comes with DSC/DSE
Alternately there is a new RCassandra package which looks nice too.
R, Cassandra, and Hive
For accessing Hive and Cassandra from R, I will be using DataStax Enterprise.
First, startup the hive server: dse hive --service hiveserver
I hope this post has shown how simple it is to access your Cassandra data from R, and why combining it with the hundreds of statistical methods the community has added is a powerful combination.
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