6 Questions
Which of the following statements regarding data caching in Apache Spark is false?
Caching only a part of an RDD has no performance benefits.
Which of the following statements about parquet storage format is false?
Given a dataframe with 100 columns, it is faster to query a single column of the dataframe if the data are stored using the CSV storage format compared to the parquet storage format.
Which of the following statements is false?
DataSets contain schemas whereas DataFrames do not contain schemas.
What is a benefit of using the partitionBy function in SparkSQL?
It allows you to quickly retrieve all data associated with a given value on the partitioned column.
Which of the following statements about query optimisation in Spark is false?
Spark automatically applies query optimisation on a sequence of RDD transformations.
Which of the following statements is false?
You need to explicitly invoke a combiner in order to enjoy the benefits of reduced data shuffle when using the reduceByKey function.
Test your knowledge of Apache Spark and SparkSQL by identifying false statements about data caching, Parquet storage format, partitionBy function, and query optimization.
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