Presented at SIGMOD 2013, this paper from Google details another innovation stemming from Google Ads, a platform known for its planet-scale data processing. Notable authors include Ashish Gupta , a senior engineering leader within Google Ads, and Manpreet Singh , a principal engineer at Google. The year 2013 marked a significant period for stream processing, as Google was concurrently developing MillWheel and Dataflow , foundational technologies that influenced the creation of Apache Flink and Apache Beam .