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Cloudera CDP Data Engineer - Certification Exam Sample Questions (Q302-Q307):

NEW QUESTION # 302
You're building an Airflow ETL pipeline that involves data validation checks. How can you integrate these checks into the pipeline and handle potential failures?

A. Leverage XCom to share the validation results with downstream tasks for further processing.
B. Use the FailoverOperator to automatically skip downstream tasks if the validation check fails.
C. Configure the DAG to send email notifications upon validation failures for manual intervention.
D. Implement the validation checks within custom Python operators and raise exceptions upon failure, triggering downstream tasks to handle the error.

Answer: D

Explanation:
Option A is the most appropriate approach for integrating data validation checks within the pipeline. By raising exceptions upon failure, you can control the flow of the DAG and trigger appropriate actions based on the validation results.

NEW QUESTION # 303
You're experimenting with Iceberg table formats (vl and v2). Which of the following statements is true regarding their differences?

A. V2 introduces mandatory partitioning, while V1 allows for unpartitioned tables.
B. V2 uses manifest lists instead of manifest files for tracking data files.
C. V2 supports new data types like UUIDs, which are unavailable in V1.
D. V2 tables are generally less performant than V1 tables due to added metadata overhead.

Answer: B

NEW QUESTION # 304
In Apache Spark, which storage level is recommended for caching data that is accessed frequently but is too large to fit in memory?

A. DISK ONLY
B. MEMORY AND DISK
C. OFF HEAP
D. MEMORY ONLY

Answer: B

Explanation:
The MEMORY_AND_DISK storage level is recommended for caching data that is frequently accessed but too large to fit entirely in memory. This level stores the data in memory as much as possible and spills the remainder to disk, providing a good balance between performance and resource utilization.

NEW QUESTION # 305
How does Spark achieve fault tolerance during distributed processing?

A. By implementing automatic checkpointing of intermediate results
B. By restarting failed tasks on different nodes
C. By replicating data across all nodes in the cluster
D. null

Answer: D

Explanation:
Spark employs a combination of data lineage tracking, checkpointing, and task re-execution to ensure job completion even in the event of node failures.

NEW QUESTION # 306
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?

Answer: D

Explanation:
Option A is correct because it properly uses the JDBC format with all the necessary options including the URL, database table, and user credentials.

NEW QUESTION # 307
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