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Cloudera CDP Data Engineer - Certification Sample Questions:
1. You need to design a DAG that can be easily paused, resumed, or skipped based on specific conditions. How can you achieve this functionality?
A) Leverage Airflow XCom to share information about the desired action (pause, resume, skip) between tasks.
B) Implement custom logic within each task to check for pause or skip conditions.
C) Configure the DAG to run continuously without any manual intervention.
D) Utilize Airflow pools to dynamically control the execution of tasks based on resource availability.
2. Which approach can help mitigate issues with schema inference for complex data types in a big data environment?
A) Decreasing the frequency of data ingestion to reduce processing load
B) Using only traditional RDBMS systems that require explicit schema definitions
C) Ignoring schema inference and processing all data as plain text
D) Combining schema inference with schema evolution and user-defined schemas for complex datasets
3. In the context of Spark, what is a potential downside of indiscriminate use of data caching, especially with the MEMORY_AND DISK storage level?
A) It can lead to reduced fault tolerance due to reliance on in-memory storage.
B) It enhances data security by storing intermediate results in encrypted form.
C) It may increase execution time due to overheads from frequent disk 1/0 operations.
D) It can decrease network traffic by reducing the need for data shuffling.
4. In Apache Airflow, what is the purpose of setting max_active_runs in a DAG's configuration?
A) To specify the maximum number of DAG runs that can be executed in parallel.
B) To control the number of retries for a failed task.
C) To determine the maximum number of DAG files that can be parsed at any given time.
D) To limit the number of task instances that can run concurrently within the DAG.
5. Which of the following is NOT a factor considered by the Optimization Framework when optimizing a query?
A) The phase of the moon
B) User-defined functions (UDFs) complexity
C) Data skewness
D) Network latency between nodes
Solutions:
| Question # 1 Answer: A | Question # 2 Answer: D | Question # 3 Answer: C | Question # 4 Answer: A | Question # 5 Answer: A |
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