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Cloudera CDP Data Engineer - Certification Sample Questions:

1. Your Airflow DAG encounters an error during the data transformation stage. What information can you access in the Airflow UI to troubleshoot the issue?

A) The DAG run details page displays the task logs, providing insights into the specific error encountered.
B) The Airflow web server logs might contain relevant information about the error.
C) You need to manually inspect the code for potential issues.
D) All of the above

2. 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

3. What is the primary advantage of using Apache Spark for distributed processing compared to traditional single-node processing?

A) Increased storage capacity
B) Faster processing of large datasets
C) Improved data visualization capabilities
D) Enhanced data security

4. Your Spark application involves complex data transformations requiring multiple shuffles. How can you leverage Spark's in- memory caching mechanisms to improve performance?
A Use rdd.persist(StorageLevel.MEMORY_ONLY) for all intermediate RDDs

A) Leverage Spark SQL caching with materialized views
B) Tune Spark configuration parameters like spark.storage.memoryFraction
C) Implement custom caching logic using in-memory data structures

5. 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 signifies that the join operation is performed by sorting and then merging two datasets, which can be efficient for large, sorted datasets
C) It indicates that the query will benefit from additional indexes
D) It is the least preferred join method due to its high CPU usage

Solutions: