To date, Hadoop usage has focused primarily on offline analysis--making sense of web logs, parsing through loads of unstructured data in HDFS, etc. But what if you want to run map/reduce against your live data set without affecting online performance? Combining Hadoop with Cassandra's multi-datacenter replication capabilities makes this possible. If you're interested in getting value from your data without the hassle and latency of first moving it into Hadoop, this talk is for you. I'll show you how to connect all the parts, enabling you to write map/reduce jobs or run Pig queries against your live data. As a bonus I'll cover writing map/reduce in Scala, which is particularly well-suited for the task.