All complicated distributed systems, such as Apache Cassandra, require careful and extensive testing of their guarantees. The ubiquity of subtle bugs in such systems has been brought to light by Kyle Kingsbury's ""Call Me Maybe"" series. At DataStax, we have developed Fallout, a Testing as a Service offering of Kingsbury's Jepsen library facilitate testing of Apache Cassandra's consistency guarantees. Philip will discuss Jepsen, the development of Fallout, and the improvements it has brought to Apache Cassandra. About the Speaker Philip Thompson Software Engineer, DataStax I'm a software engineer at DataStax, and the maintainer of CCM. I create tools to assist with testing Apache Cassandra.