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Databricks-Certified-Associate-Developer-for-Apache-Spark-3.0
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Databricks Certified Associate Developer for Apache Spark 3.0 Exam
Last Update: Nov 14, 2024
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The Databricks Certified Associate Developer for Apache Spark 3.0 exam is a certification test that validates a candidate's ability to develop Spark applications using the Apache Spark 3.0 platform.

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Databricks Certified Associate Developer for Apache Spark 3.0 Exam Questions and Answers

Questions 1

Which of the following code blocks reads in parquet file /FileStore/imports.parquet as a DataFrame?

Options:

A.

spark.mode("parquet").read("/FileStore/imports.parquet")

B.

spark.read.path("/FileStore/imports.parquet", source="parquet")

C.

spark.read().parquet("/FileStore/imports.parquet")

D.

spark.read.parquet("/FileStore/imports.parquet")

E.

spark.read().format('parquet').open("/FileStore/imports.parquet")

Questions 2

Which of the following describes a way for resizing a DataFrame from 16 to 8 partitions in the most efficient way?

Options:

A.

Use operation DataFrame.repartition(8) to shuffle the DataFrame and reduce the number of partitions.

B.

Use operation DataFrame.coalesce(8) to fully shuffle the DataFrame and reduce the number of partitions.

C.

Use a narrow transformation to reduce the number of partitions.

D.

Use a wide transformation to reduce the number of partitions.

Use operation DataFrame.coalesce(0.5) to halve the number of partitions in the DataFrame.

Questions 3

Which of the following code blocks stores DataFrame itemsDf in executor memory and, if insufficient memory is available, serializes it and saves it to disk?

Options:

A.

itemsDf.persist(StorageLevel.MEMORY_ONLY)

B.

itemsDf.cache(StorageLevel.MEMORY_AND_DISK)

C.

itemsDf.store()

D.

itemsDf.cache()

E.

itemsDf.write.option('destination', 'memory').save()

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