CoreOS Fest 2016

Developing and maintaining distributed systems is difficult. We believe that the difficulties comes from lacking of a good debugger for the systems. Unlike non-distributed systems, bugs in the distributed systems are not understood well. Therefore building good debuggers is still difficult. The presenter will introduce Namazu project, an OSS framework of distributed systems fuzzing tester. Namazu focuses on two points of the systems: 1. error handling of hardware fault, and 2. non determinism of events e.g. packet arrival. They are distributed systems specific points and not covered by existing debugging techniques. The presenter will share success stories of removing bugs of real systems including etcd, Zookeeper, and Apache Yarn with Namazu.