S4 is another near-real-time project for Hadoop. S4 is built with a decentralized architecture in mind, focusing on a scaleable and event-oriented architecture. S4 is a long-running process that analyzes streaming data.

S4 is built with Java and with flexibility in mind. This is done via dependency injection, which makes the platform very easy to extend and change. S4 heavily relies on Loose-coupling and dynamic association via the Publish/Subscribe pattern. This makes it easy for S4 to integrate sub-systems into larger systems and updating services on sub-systems can be done independently.

S4 is built to be highly fault-tolerant. Mechanisms built into S4 allow fail-over and recovery.

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