Apache Flink

Open-source stream processing framework for real-time data analytics and event-driven applications. Apache Flink processes unbounded data streams with low latency and high throughput. Supports complex event processing, temporal joins, and stateful transformations. Event time semantics for accurate windowing. Scalable to thousands of nodes. APIs in Java, Python, and SQL. Can backprocess historical data. Community-driven development. Free and open source. Best for real-time analytics, fraud detection, anomaly detection. Handles millions of events per second with millisecond latency.

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