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27 Sep 2022
In this post we’ll discuss the paper Photon: Fault-tolerant and Scalable Joining of Continuous Data Streams by Ananthanarayanan et al. [1]. This 2013 paper described the Photon system developed at Google used for associating search queries and ads clicks with low-latency.
This system supports millions of events per second, exactly-once semantics and out-of-order events, with P90 latency less than 7s.