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Cloudera CDP Data Engineer - Certification Exam Sample Questions (Q107-Q112):
NEW QUESTION # 107
How does dynamic schema inference impact the processing of streaming data in real-time analytics platforms?
- A. It enables the platform to adapt to changes in data format without downtime.
- B. It decreases the overall throughput of the analytics platform.
- C. It significantly increases the latency of data processing operations.
- D. It requires streaming data to be stored before its schema can be inferred.
Answer: A
Explanation:
Dynamic schema inference allows real-time analytics platforms to adapt to changes in data formats on the fly, without requiring system downtime or manual intervention. This adaptability is crucial for streaming data, which can vary in structure over time, ensuring continuous, efficient processing and analysis of incoming data streams.
NEW QUESTION # 108
Your Airflow DAG involves sending notifications upon successful completion of the entire pipeline. How can you achieve this functionality?
- A. Utilize Airflow variables to store notification details and access them within the final task.
- B. Configure the Airflow web UI to send alerts based on DAG run status.
- C. Implement a custom notification script within the final task of the DAG.
- D. Use the Email Operator to send an email notification upon successful DAG run completion.
Answer: D
Explanation:
The EmailOperator in Airflow provides a convenient way to send email notifications based on DAG run completion status. While other options might be used in specific scenarios, option B is the most straightforward approach for sending completion notifications.
NEW QUESTION # 109
You have a PySpark application packaged as 'MyPySparkApp-0. I-py3-none-any.whl'. In your 'app.py', you utilize a function from an external library, 'numpy', listed in your 'requirements.txt'. How should you deploy this application to ensure 'numpy' is available at runtime?
- A. Upload 'app.py' only and submit using 'spark-submit app.py'.
- B. Upload 'app.py' and manually install 'numpy' on all nodes before submitting using 'spark-submit app.py'.
- C. Upload both 'app.py' and 'MyPySparkApp-0.1-py3-none-any.whl' and submit using 'spark-submit --py-files MyPySparkApp-0.1-py3-none- any.whl app.py'.
- D. Upload 'MyPySparkApp-0.1-py3-none-any.whl' only and submit using 'spark-submit --py-files MyPySparkApp-0.1-py3-none-any.whl'.
Answer: C
Explanation:
The application 'app.py' depends on the 'numpy' library, which is packaged in the wheel file 'MyPySparkApp-0.1-py3-none- any.whl'. Therefore, both the application file and the wheel file need to be uploaded. The application is then submitted with the '-- py-files' option to include the wheel file, ensuring 'numpy' is available at runtime.
NEW QUESTION # 110
In Apache Airflow, how can you dynamically generate tasks for each table in your database that needs a quality check?
- A. Use the Variable feature to store a list of tables and iterate over them with a PythonOperator.
- B. Implement a BranchPythonOperator to create branches for each table dynamically.
- C. Utilize the Dynamic Task Mapping feature to create a task for each table.
- D. Use the SubDagOperator to create a sub-DAG for each table.
Answer: C
Explanation:
Dynamic Task Mapping is a feature in Apache Airflow 2.0 and later that allows you to dynamically generate tasks at runtime. This can be used to create a separate quality check task for each table in your database by iterating over a list of tables and generating a task for each one, ensuring all necessary quality checks are automated and scalable.
NEW QUESTION # 111
Your Spark application on Kubernetes requires a secure connection to a database. You've stored the database password in Kubernetes Secrets. How would you typically access this secret in your PySpark application?
- A. Through an external secrets manager
- B. By reading the secret file from a volume mount
- C. By using a ConfigMap
- D. By querying the Kubernetes API
Answer: B
Explanation:
Kubernetes Secrets can be mounted as volumes and accessed within the pod. In a PySpark application, you can read these secrets from the mounted path, making it a secure way to access sensitive information like database passwords.
NEW QUESTION # 112
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