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GCP Professional Data Engineer Practice Question

Your team has packaged a nightly Apache Beam batch pipeline as a Dataflow Flex Template located at gs://analytics-pipelines/daily-etl.json. You need to expand an existing Cloud Composer DAG so that:

  • input_path and load_date values are passed to the template at run time
  • the Composer worker releases its slot immediately after the job is launched, yet downstream tasks must wait until the Dataflow job finishes successfully
  • any job still running after 6 hours is cancelled automatically to control costs

Which solution meets these requirements while requiring the least custom code?

  • Invoke the template from a BashOperator that calls gcloud dataflow flex-template run, then use a PythonSensor to poll Cloud Logging for completion and a BashOperator to cancel the job if polling exceeds 6 hours.

  • Launch the template with DataflowTemplateOperator and set max_num_workers=0 so autoscaling stops the job after 6 hours, allowing downstream tasks to start immediately.

  • Use DataflowStartFlexTemplateOperator with wait_until_finished=True and set its timeout to 6 hours, allowing the operator itself to block until completion or error.

  • Start the job with DataflowStartFlexTemplateOperator (wait_until_finished=False), passing input_path and load_date through the operator's body; chain a DataflowJobStatusSensor with a 6-hour timeout, and on sensor failure run a DataflowStopJobOperator to cancel the job before downstream tasks.

GCP Professional Data Engineer
Maintaining and automating data workloads
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