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Cloudera CDP Data Engineer - Certification Sample Questions:

1. You are working on a project that involves processing large datasets stored in HDFS. You need to read a CSV file into a DataFrame using PySpark. Which of the following code snippets correctly achieves this?

A)

B)

C)

D)

2. Which technique in the Optimization Framework is primarily used to improve query performance by reducing the number of rows to be scanned in a table?

A) Data compaction
B) Predicate pushdown
C) Data replication
D) Indexing

3. Which of the following commands is used to install PySpark in your development environment?

A) pip install pyspark
B) yarn add pyspark
C) npm install pyspark
D) brew install pyspark

4. What is the primary purpose of the Cost-Based Optimizer (CBO) in the context of Cloudera's Optimization Framework?

A) To minimize the amount of data processed
B) To choose the data storage format
C) To distribute data evenly across the cluster
D) To decide the best execution plan based on the cost of operations

5. When leveraging Spark's DataFrame API for caching, what implicit optimization does Spark perform to enhance processing efficiency?

A) Inlining of functions to reduce the overhead of JVM method calls
B) Automatic selection of the optimal storage level based on the DataFrame's size
C) Automatic conversion of all operations to map-reduce jobs
D) Predicate pushdown and other logical optimizations before physical execution

Solutions: