KIP-28 — Add a processor client

Discussion Kafka 1.0 Streams

Surveys and compares related stream processing frameworks (MillWheel, Spark Streaming, Storm, Samza, Flink) to provide design context for Kafka Streams. Understanding prior art in watermarking, out-of-order handling, state management, and windowing is necessary before defining Kafka Streams' own approach to these problems.

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