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Cloudera CDP Data Engineer - Certification Sample Questions:
1. Which command line tool is essential for interacting with Cloudera's Hadoop ecosystem for file operations?
A) SSH
B) ci-JRL
C) Git
D) Hadoop fs
2. In the context of improving join performance in Spark, what does "salting" involve?
A) Physically co-locating related data on the same node
B) Adding a random prefix to keys to distribute skewed data more evenly
C) Seasoning the data with random noise for privacy
D) Encrypting the data before performing a join
3. You have an Airflow DAG that includes tasks for data extraction, transformation, and loading. You notice that the transformation tasks are computationally intensive and are causing delays in the DAG's execution. To optimize performance, you decide to offload these tasks to a cloud-based service that can scale dynamically. Which approach ensures minimal changes to the DAG structure while integrating this optimization?
A) Implement the transformation tasks as DockerOperator tasks, with each task running in a containerized environment on the cloud service.
B) Use the ExternalTaskSensor to wait for the transformation to complete on the cloud service before proceeding.
C) Modify the transformation tasks to use the PythonOperator to make API calls to the cloud service, handling the transformation.
D) Replace the transformation tasks with HttpSensor tasks that trigger the cloud service and poll for completion.
4. Which feature in Apache Airflow allows you to retry a data quality check task if it fails initially due to transient issues?
A) Branching
B) retries parameter in the task definition
C) SLAs
D) catchup
5. How can you utilize Spark's lineage tracking feature to improve the efficiency of your data pipelines?
A) Spark's lineage tracking doesn't offer any performance benefits
B) Manually track the lineage of each transformation for debugging purposes
C) Leverage lineage information to identify and recompute only the affected data after failures
D) Use lineage tracking to optimize the order of transformations for better performance
Solutions:
| Question # 1 Answer: D | Question # 2 Answer: B | Question # 3 Answer: C | Question # 4 Answer: B | Question # 5 Answer: C |
By Carol
