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Cloudera CDP Data Engineer - Certification Sample Questions:

1. In a PySpark application, you're writing a function that reads a CSV file and shows the first few rows. Which of the following code snippets correctly accomplishes this task?

A) Option A
B) Option D
C) Option C
D) Option B

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

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

3. You're debugging a slow-running Spark job writing a large Iceberg table. Which optimization techniques could improve performance? (Choose three.

A) Repartitioning the DataFrame before writing to Iceberg
B) Disabling Spark's adaptive query execution
C) Using the Z-Order clustering option in Iceberg
D) Converting the DataFrame to RDD for Iceberg writes
E) Filtering data as early as possible in the Spark transformation pipeline

4. What is the significance of "Sort Merge Join" appearing in an Explain Plan in Cloudera's SQL engines?

A) It suggests that the join operation is performed without sorting, leading to faster execution
B) It is the least preferred join method due to its high CPU usage
C) It signifies that the join operation is performed by sorting and then merging two datasets, which can be efficient for large, sorted datasets
D) It indicates that the query will benefit from additional indexes

5. 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 tables are generally less performant than V1 tables due to added metadata overhead.
C) V2 uses manifest lists instead of manifest files for tracking data files.
D) V2 supports new data types like UUIDs, which are unavailable in V1.

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