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Cloudera CDP Data Engineer - Certification Exam Sample Questions (Q120-Q125):

NEW QUESTION # 120
What are the potential trade-offs to consider when using checkpointing in Spark applications?

A. Checkpointing requires manual configuration and can be error-prone
B. All of the above
C. Checkpointing introduces overhead for storing and recovering data, impacting performance
D. Checkpointing always improves performance and has no drawbacks

Answer: B,C

Explanation:
While checkpointing offers benefits, it comes with trade-offs. It adds overhead for storing and recovering data, potentially impacting performance B. Configuring checkpoints effectively is crucial to avoid unnecessary overhead. Option A is incorrect, and while configuration is involved, it's not inherently error-prone C when done carefully.

NEW QUESTION # 121
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. Implement custom instrumentation code within your Spark application
C. Manually analyze Spark logs after job completion
D. Leverage YARN resource manager and Spark metrics for detailed monitoring

Answer: D

Explanation:
While logs and the web UI provide some insights, option C offers comprehensive monitoring. YARN provides resource allocation and utilization details, while Spark metrics capture various performance aspects like shuffle bytes, task completion times, and GC (garbage collection) activity.
These combined sources allow for detailed analysis and troubleshooting.

NEW QUESTION # 122
What information does an "Explain Plan" typically provide in the context of SQL query optimization?

A. The expected time of query completion
B. The names of users who have executed the query
C. The sequence of operations the database will perform to execute the query
D. The cost of the query in monetary terms

Answer: C

Explanation:
An Explain Plan outlines the sequence of operations (like joins, scans, sorts, and aggregations) that the database engine will perform to execute a given SQL query- It helps in understanding and optimizing the performance of the query.

NEW QUESTION # 123
You need to handle potential errors and retries within your Airflow ETL pipeline. How can you achieve this functionality?

A. Configure the DAG to retry failed tasks automatically with a set number of retries.
B. Implement exception handling within your custom Python operators and define retry behavior manually.
C. All of the above
D. Use the BranchPythonOperator to check for specific error conditions and branch the DAG execution accordingly.

Answer: C

Explanation:
All options mentioned in D are valid approaches to handle errors and retries in Airflow. You can implement custom error handling, utilize conditional branching based on errors, and configure automatic retries for failed tasks to ensure robustness in your ETL pipeline.

NEW QUESTION # 124
How does Apache NiFi support schema inference during data flow management?

A. Utilizing external schema repositories exclusively for schema management
B. By manually specifying schemas for each data source
C. Through processors that automatically detect data formats and schemas
D. By enforcing static schemas for all data flows

Answer: C

Explanation:
Apache NiFi supports schema inference through its processors that can automatically detect and apply schemas to the data as it flows through the system. This capability allows NiFi to manage data flows more dynamically, accommodating various data formats and schemas without requiring manual specification for each data source, thus enhancing flexibility in data ingestion and processing.

NEW QUESTION # 125
......

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