Integrating fault-tolerance and elasticity in a distributed data stream processing system

Recently there has been an increasing interest in building distributed platforms for processing of fast data streams. In this demonstration, we highlight the need for elasticity in distributed data stream processing systems and present Enorm, a data stream processing platform with focus on elasticity, i.e. the ability to dynamically scale resource usage according to the runtime workload fluctuations. In order to achieve dynamic scaling with minimal overhead and latency, we use an integrated approach for both fault-tolerance and elasticity. The idea is that both fault-tolerance and elasticity essentially require replicating or migrating computation states among different nodes. Integrating and sharing the state management operations between the two modules can not only provide abundant opportunities to reduce the system's runtime overhead but also simplify the system's architecture.