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Databricks Certified Associate Developer for Apache Spark 3.5 - Python Sample Questions:

1. A data engineer needs to persist a file-based data source to a specific location. However, by default, Spark writes to the warehouse directory (e.g., /user/hive/warehouse). To override this, the engineer must explicitly define the file path.
Which line of code ensures the data is saved to a specific location?
Options:

A) users.write.saveAsTable("default_table").option("path", "/some/path")
B) users.write.option("path", "/some/path").saveAsTable("default_table")
C) users.write(path="/some/path").saveAsTable("default_table")
D) users.write.saveAsTable("default_table", path="/some/path")

2. Given a DataFrame df that has 10 partitions, after running the code:
result = df.coalesce(20)
How many partitions will the result DataFrame have?

A) 1
B) Same number as the cluster executors
C) 10
D) 20

3. A Spark application suffers from too many small tasks due to excessive partitioning. How can this be fixed without a full shuffle?
Options:

A) Use the repartition() transformation with a lower number of partitions
B) Use the distinct() transformation to combine similar partitions
C) Use the sortBy() transformation to reorganize the data
D) Use the coalesce() transformation with a lower number of partitions

4. A developer initializes a SparkSession:

spark = SparkSession.builder \
.appName("Analytics Application") \
.getOrCreate()
Which statement describes the spark SparkSession?

A) The getOrCreate() method explicitly destroys any existing SparkSession and creates a new one.
B) A SparkSession is unique for each appName, and calling getOrCreate() with the same name will return an existing SparkSession once it has been created.
C) If a SparkSession already exists, this code will return the existing session instead of creating a new one.
D) A new SparkSession is created every time the getOrCreate() method is invoked.

5. What is the behavior for function date_sub(start, days) if a negative value is passed into the days parameter?

A) The number of days specified will be added to the start date
B) The number of days specified will be removed from the start date
C) The same start date will be returned
D) An error message of an invalid parameter will be returned

Solutions: