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Which Cloud Dataflow / Beam feature should you use to aggregate data in an unbounded data source every hour based on the time when the data entered the pipeline?
Correct Answer: D
When collecting and grouping data into windows, Beam uses triggers to determine when to emit the aggregated results of each window. Processing time triggers. These triggers operate on the processing time - the time when the data element is processed at any given stage in the pipeline. Event time triggers. These triggers operate on the event time, as indicated by the timestamp on each data element. Beam's default trigger is event time-based. Reference: https://beam.apache.org/documentation/programming-guide/#triggers
