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Cloudera CDP Data Engineer - Certification Sample Questions:

1. When persisting an RDD in Spark, what factors should you consider when choosing the storage level (e.g., MEMORY ONLY, MEMORY AND_DISK)?

A) Only consider the size of the RDD
B) Balance memory usage with fault tolerance needs
C) All of the above
D) Prioritize keeping data in memory for faster access

2. Consider the following code snippet:# Sample DataFrame (assuming it exists) df = spark.createDataFrame(...)
# Attempt to add a new column with a case-when expression (fix the error) df = df.withColumn("category", F.when(df["price"] ] 100, "Expensive").otherwise("Cheap")) df.show() What is the error in this code, and how can it be fixed?

A) There is no error in the code snippet.
B) The error is using the wrong syntax for case-when expressions. Fix: Use SQL-like syntax with CASE WHEN and END.
C) The error is attempting to modify the original DataFrame in-place. Fix: Use df.withColumn to create a new DataFrame with the added column.
D) The error is missing parentheses around the conditions in the when function. Fix: F.when((df["price"] ] 100), "Expensive").otherwise("Cheap")

3. A data engineer is deploying a Spark application on a Kubernetes cluster. To minimize downtime during updates, which Kubernetes deployment strategy should be considered?

A) Rolling Updates
B) Persistent Volumes
C) Node Affinity
D) Pod Autoscaling

4. In a PySpark application running on Kubernetes, you want to enable dynamic allocation of Executors. Which configuration setting is essential to turn on this feature?

A) 'spark.executor.instances'
B) 'spark.dynamicAllocation.enabled'
C) 'spark.kubernetes.executor.dynamicAllocation'
D) 'spark.kubernetes.dynamicAllocation.enabled'

5. Which command line tool is essential for interacting with Cloudera's Hadoop ecosystem for file operations?

A) Hadoop fs
B) Git
C) SSH
D) ci-JRL

Solutions: