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Cloudera CDP Data Engineer - Certification Sample Questions:

1. Your Airflow DAG involves tasks that require access to confidential data like passwords or API keys. How can you securely manage and access these credentials within the DAG?

A) All of the above
B) Implement a custom secret management solution outside of Airflow.
C) Utilize environment variables to store the credentials and access them within the tasks.
D) Store the credentials directly within the DAG code, assuming limited access to the codebase.

2. You're tasked with monitoring the performance and resource utilization of your Spark jobs. What tools and techniques can you employ for effective monitoring and troubleshooting?

A) Use Spark's web UI for basic job status information
B) Manually analyze Spark logs after job completion
C) Implement custom instrumentation code within your Spark application
D) Leverage YARN resource manager and Spark metrics for detailed monitoring

3. In Apache Airflow, what is the purpose of setting max_active_runs in a DAG's configuration?

A) To specify the maximum number of DAG runs that can be executed in parallel.
B) To determine the maximum number of DAG files that can be parsed at any given time.
C) To control the number of retries for a failed task.
D) To limit the number of task instances that can run concurrently within the DAG.

4. You are working on a project that involves processing large datasets stored in HDFS. You need to read a CSV file into a DataFrame using PySpark. Which of the following code snippets correctly achieves this?

A)

B)

C)

D)

5. Your Airflow DAG involves tasks that require access to specific resources like databases or external services. How can you ensure these resources are available and properly configured for the DAG execution?

A) Grant everyone access to all resources to avoid potential configuration issues.
B) Hardcode connection details (credentials, URLs) directly within the DAG code.
C) Implement custom logic within each task to dynamically discover and connect to resources.
D) Utilize Airflow connections to store and manage resource details securely.

Solutions: