This session is a case study of how we used our already existing HBase cluster as content addressable storage for BLOBs. We will discuss how we wrote a CAS implementation using HBase as the backend, Scala and Finagle as the application and using caching reverse proxies (i.e. Varnish in our case) for serving BLOBs at scale. The talk will dicuss why content addressable storage is the right pattern for many web use cases, how to foster an already existing HBase cluster for better usage of possibly underutilized resources, and operational gotchas to store and serve BLOBs from HBase at scale.