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Exam Certified Associate Developer for Apache Spark All Questions

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Exam Certified Associate Developer for Apache Spark topic 1 question 86 discussion

Actual exam question from Databricks's Certified Associate Developer for Apache Spark
Question #: 86
Topic #: 1
[All Certified Associate Developer for Apache Spark Questions]

Which of the following code blocks will always return a new 4-partition DataFrame from the 8-partition DataFrame storesDF without inducing a shuffle?

  • A. storesDF.repartition(4, "sqft")
  • B. storesDF.repartition()
  • C. storesDF.coalesce(4)
  • D. storesDF.repartition(4)
  • E. storesDF.coalesce
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Suggested Answer: C 🗳️
by azure_bimonster at Feb. 9, 2024, 3:15 p.m.

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azure_bimonster
9 months, 3 weeks ago
Selected Answer: C
C is the right one here. Unlike repartition(), coalesce() reduces the number of partitions without shuffling the data. By specifying the number of partitions (4), it ensures that the resulting DataFrame has 4 partitions without inducing a shuffle.
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