RHadoop is an open source project aiming to combine two rising star in the analytics firmament: R and Hadoop. With more than 2M users, R is arguably the dominant language to express complex statistical computations. Hadoop needs no introduction at HUG. With RHadoop we are trying to combine the expressiveness of R with the scalability of Hadoop and to pave the way for the statistical community to tackle big data with the tools they are familiar with. At this time RHadoop is a collection of three packages that interface with HDFS, HBase and mapreduce, respectively. For mapreduce, the package is called rmr and we tried to give it a simple, high level interface that's true to the mapreduce model and integrated with the rest of the language. We will cover the API and provide some examples.