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Databricks Databricks-Certified-Associate-Developer-for-Apache-Spark-3.0 Dumps Questions Answers

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Databricks Certified Associate Developer for Apache Spark 3.0 Exam

Last Update Mar 21, 2023
Total Questions : 180

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

Questions 1

Which of the following is a problem with using accumulators?



Only unnamed accumulators can be inspected in the Spark UI.


Only numeric values can be used in accumulators.


Accumulator values can only be read by the driver, but not by executors.


Accumulators do not obey lazy evaluation.


Accumulators are difficult to use for debugging because they will only be updated once, independent if a task has to be re-run due to hardware failure.

Questions 2

Which of the following code blocks returns a DataFrame that has all columns of DataFrame transactionsDf and an additional column predErrorSquared which is the squared value of column

predError in DataFrame transactionsDf?



transactionsDf.withColumn("predError", pow(col("predErrorSquared"), 2))


transactionsDf.withColumnRenamed("predErrorSquared", pow(predError, 2))


transactionsDf.withColumn("predErrorSquared", pow(col("predError"), lit(2)))


transactionsDf.withColumn("predErrorSquared", pow(predError, lit(2)))


transactionsDf.withColumn("predErrorSquared", "predError"**2)

Questions 3

The code block displayed below contains an error. The code block should arrange the rows of DataFrame transactionsDf using information from two columns in an ordered fashion, arranging first by

column value, showing smaller numbers at the top and greater numbers at the bottom, and then by column predError, for which all values should be arranged in the inverse way of the order of items

in column value. Find the error.

Code block:

transactionsDf.orderBy('value', asc_nulls_first(col('predError')))



Two orderBy statements with calls to the individual columns should be chained, instead of having both columns in one orderBy statement.


Column value should be wrapped by the col() operator.


Column predError should be sorted in a descending way, putting nulls last.


Column predError should be sorted by desc_nulls_first() instead.


Instead of orderBy, sort should be used.