Cloudera CDP-3002 - CDP Data Engineer - Certification Exam

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Cloudera CDP-3002 Exam Syllabus Topics:

Cloudera CDP Data Engineer - Certification Sample Questions:

1. What does the appearance of "Filter Early" in an Explain Plan suggest about the execution strategy of a SQL query in Cloudera's SQL engines?

A) It indicates that filtering operations are postponed until the end of the query execution
B) It signals that the query will bypass filtering operations to improve performance
C) It suggests that the query optimizer has chosen to apply filtering operations as early as possible to reduce data volume
D) It means that all filtering operations are applied after join operations

2. You're building a Spark application that involves complex iterative data processing. Which option allows you to efficiently access and update intermediate results between iterations?

A) Use Spark's broadcast variables for frequently accessed data across iterations
B) Implement custom data structures for managing intermediate data
C) Store intermediate results in temporary tables using Spark SQL
D) Leverage Spark's in-memory caching capabilities with rdd.cache()

3. You're working with a DataFrame containing customer data, including a "purchase_date" column. How can you calculate the average purchase amount per month for the past year?

A) Convert the "purchase_date" column to a string and filter based on the year
B) Utilize Spark's machine learning library (MLIiB. for time series analysis
C) Loop through the DataFrame and group purchases by month, calculating the average manually
D) Use Spark SQL's MONTH function and AVG function with appropriate windowing

4. What is the impact of setting the Spark configuration spark.sql.autoBroadcastJoinThreshold to -1?

A) It sets an unlimited threshold for broadcasting tables, which may cause out-of-memory errors.
B) It automatically selects the optimal threshold for broadcasting based on the cluster's current workload.
C) It increases the threshold for choosing which table to broadcast in a join, potentially improving join performance.
D) It disables the broadcast join feature, forcing all joins to be shuffled joins.

5. 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) catchup
C) retries parameter in the task definition
D) SLAs

Solutions: