DEA-C01 practice question: Event triggers and schedules (2 of 2)

Data Ingestion and Transformation A free question from our original DEA-C01 practice exam. Try it, then open the answer to see why each option is right or wrong.

A dental chain has clinics in New York, Chicago and Denver, and it runs a nightly load of appointment data. Each regional load must start at 2:00 AM local time, and it must keep that local time through daylight saving changes. Once started, the load runs its Glue jobs in order and stops if one of them fails.

The team wants the schedules managed in AWS, with no cron jobs on servers.

Which TWO options meet these requirements? (Choose two.)

Choose two answers.

A. Create a Glue scheduled trigger with a cron expression of 2:00 AM UTC, and edit the expression by hand each time daylight saving time starts or ends.
B. Create an EventBridge Scheduler schedule per region with its IANA time zone, targeting a Step Functions state machine for the Glue jobs.
C. Create an EventBridge rule with the cron expression 0 2 * * ? * for each region, and let the rule's target start the Glue jobs.
D. Create an MWAA DAG with a timezone-aware schedule for each region, and let it run the Glue jobs in sequence with failure handling.
E. Run a Lambda function that sleeps until 2:00 AM local time and then starts the jobs, using a long-running loop for each region.

Show the answer and explanation

Answers: B, D

A. Wrong: Glue schedule expressions are evaluated in UTC, so a fixed expression moves relative to local clocks at each daylight saving change. Hand edits twice a year are error-prone and create work the team wants to avoid. Learn more: Time-based schedules for jobs and crawlers (opens in a new tab)
B. Right: Correct. EventBridge Scheduler accepts an IANA time zone for each cron schedule and adjusts automatically for daylight saving time. A Step Functions state machine can run the Glue jobs in sequence and stop the run when one job fails. Learn more: Schedule types in EventBridge Scheduler (opens in a new tab)
C. Wrong: EventBridge rule cron expressions run in UTC, so the same expression starts the jobs at the wrong local time for part of the year. Rules also do not check whether an earlier job in the sequence failed. Learn more: Setting a schedule pattern for scheduled rules in Amazon EventBridge (opens in a new tab)
D. Right: Correct. Airflow supports timezone-aware schedules, so a DAG can start at 2:00 AM local time and keep that time through daylight saving changes. Tasks run the Glue jobs in order, and downstream tasks stop when one fails. Learn more: What is Amazon Managed Workflows for Apache Airflow? (opens in a new tab)
E. Wrong: Lambda functions can run for at most 15 minutes, so a loop cannot wait overnight for 2:00 AM. The approach would also need its own retry and failure handling. Learn more: Configure Lambda function timeout (opens in a new tab)

Explanation

A schedule written in UTC cannot follow local clocks through daylight saving changes, so the two correct options use time zones. EventBridge Scheduler and an Airflow DAG can both hold a local start time, and each can run the Glue jobs in order and stop when one fails. The UTC cron options and the sleeping function miss those requirements.

DEA-C01 practice question: Event triggers and schedules (2 of 2)

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