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Question 285 - Professional Data Engineer discussion

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You orchestrate ETL pipelines by using Cloud Composer One of the tasks in the Apache Airflow directed acyclic graph (DAG) relies on a third-party service. You want to be notified when the task does not succeed. What should you do?

A.
Configure a Cloud Monitoring alert on the sla_missed metric associated with the task at risk to trigger a notification.
Answers
A.
Configure a Cloud Monitoring alert on the sla_missed metric associated with the task at risk to trigger a notification.
B.
Assign a function with notification logic to the sla_miss_callback parameter for the operator responsible for the task at risk.
Answers
B.
Assign a function with notification logic to the sla_miss_callback parameter for the operator responsible for the task at risk.
C.
Assign a function with notification logic to the on_retry_callback parameter for the operator responsible for the task at risk.
Answers
C.
Assign a function with notification logic to the on_retry_callback parameter for the operator responsible for the task at risk.
D.
Assign a function with notification logic to the on_failure_callback parameter for the operator responsible for the task at risk.
Answers
D.
Assign a function with notification logic to the on_failure_callback parameter for the operator responsible for the task at risk.
Suggested answer: D

Explanation:

By assigning a function with notification logic to the on_failure_callback parameter, you can customize the action that is taken when a task fails in your DAG1.For example, you can send an email, a Slack message, or a PagerDuty alert to notify yourself or your team about the task failure2.This option is more flexible and reliable than configuring a Cloud Monitoring alert on the sla_missed metric, which only triggers when a task misses its scheduled deadline3.The sla_miss_callback parameter is also related to the sla_missed metric, and it is executed when the task instance has not succeeded and the time is past the task's scheduled execution date plus its sla4.The on_retry_callback parameter is executed before a task is retried4. These options are not suitable for notifying when a task does not succeed, as they depend on the task's schedule and retry settings, which may not reflect the actual task completion status.Reference:

1: Callbacks | Cloud Composer | Google Cloud

2: How to Send an Email on Task Failure in Airflow - Astronomer

3: Monitoring SLA misses | Cloud Composer | Google Cloud

4: BaseOperator | Apache Airflow Documentation

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asked 18/09/2024
Lucile Jeanneret
38 questions
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