When to use R, Cassandra,... for data mining?

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R

hadoop

Hello,

We are going to start a research about data mining in our company. We've chosen Cassandra as our data store. I've heard that R tool is used for data mining too. But I don't know how I can relate these to each other? Would Cassandra be enough to do data mining or we have to use R or any data mining tools too?

I'm a bit confused. Any help would be great.

Thank you!