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Cloudera CDP-3002 Exam Syllabus Topics:

Cloudera CDP Data Engineer - Certification Sample Questions:

Question 1

You're tasked with optimizing the performance of your ETL pipeline in Airflow. What are some potential strategies to consider?

A. All of the above
B. Leverage partitioning and bucketing techniques in the data warehouse to improve query performance.
C. Increase the number of worker processes in Airflow to parallelize task execution.
D. Utilize efficient data structures and algorithms within your custom Python operators for data transformation.

Question 2

You have a DataFrame containing sales data with columns "product_id", "customer id", and "amount". How can you efficiently calculate the total sales per customer?

A. Use a loop to iterate through the DataFrame and accumulate the sales for each customer
B. Utilize spark SQL's GROUP BY and SUM functions
C. Implement a custom function to group and sum the sales
D. Leverage Spark's machine learning library (MLIiB. for aggregation

Question 3

You're developing a Spark application with multiple stages, and you want to ensure that later stages only start processing after all data from the previous stage is complete. How can you achieve this dependency management in Spark?

A. Leverage Spark's lineage tracking and stage boundaries
B. Implement custom logic to track completion of each stage
C. Use explicit rdd.persist() calls in each stage
D. Set appropriate configuration for spark.sql.shuffe.partitions

Question 4

How does Airflow handle task dependencies?

A. By using the ExternalTaskSensor to pause execution until an external condition is met
B. By using the set_upstream() or set_downstream() methods, or the bitshift operators (]] and [[)
C. By specifying dependencies through the depends_on_past parameter in task definitions
D. By manually triggering tasks in the correct order

Question 5

Your team is integrating PySpark with a MySQL database. You need to read data from a table named 'employees'. Which of the following PySpark code snippets correctly accomplishes this task?

A.

B.

C.

D.

Solutions: