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Question #186 Topic 1
You are building a streaming Dataflow pipeline that ingests noise level data from hundreds of sensors placed near construction sites across a city. The sensors measure noise level every ten seconds, and send that data to the pipeline when levels reach above 70 dBA. You need to detect the average noise level from a sensor when data is received for a duration of more than 30 minutes, but the window ends when no data has been received for 15 minutes. What should you do?
A
Use session windows with a 15-minute gap duration.
B
Use session windows with a 30-minute gap duration.
C
Use hopping windows with a 15-minute window, and a thirty-minute period.
D
Use tumbling windows with a 15-minute window and a fifteen-minute .withAllowedLateness operator.