MillWheel: Fault-Tolerant Stream Processing at Internet Scale

爲什麼要做MillWheel？ 因爲當前的其他的流式系統，無法同時滿足 fault tolerance, versatility, and scalability 的需求。 Spark Streaming [34] and Sonora [32] do excellent jobs of efficient checkpointing, but limit the space of operato

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