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Databricks Certified Associate Developer for Apache Spark 3.5 - Python Sample Questions (Q17-Q22):

NEW QUESTION # 17
A developer is working with a pandas DataFrame containing user behavior data from a web application.
Which approach should be used for executing agroupByoperation in parallel across all workers in Apache Spark 3.5?
A)
Use the applylnPandas API
B)

A. Use a regular Spark UDF:
from pyspark.sql.functions import mean
df.groupBy("user_id").agg(mean("value")).show()
B. Use theapplyInPandasAPI:
df.groupby("user_id").applyInPandas(mean_func, schema="user_id long, value double").show()
C. Use themapInPandasAPI:
df.mapInPandas(mean_func, schema="user_id long, value double").show()
D. Use a Pandas UDF:
@pandas_udf("double")
def mean_func(value: pd.Series) -> float:
return value.mean()
df.groupby("user_id").agg(mean_func(df["value"])).show()

Answer: B

Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
The correct approach to perform a parallelizedgroupByoperation across Spark worker nodes using Pandas API is viaapplyInPandas. This function enables grouped map operations using Pandas logic in a distributed Spark environment. It applies a user-defined function to each group of data represented as a Pandas DataFrame.
As per the Databricks documentation:
"applyInPandas()allows for vectorized operations on grouped data in Spark. It applies a user-defined function to each group of a DataFrame and outputs a new DataFrame. This is the recommended approach for using Pandas logic across grouped data with parallel execution." Option A is correct and achieves this parallel execution.
Option B (mapInPandas) applies to the entire DataFrame, not grouped operations.
Option C uses built-in aggregation functions, which are efficient but not customizable with Pandas logic.
Option D creates a scalar Pandas UDF which does not perform a group-wise transformation.
Therefore, to run agroupBywith parallel Pandas logic on Spark workers, Option A usingapplyInPandasis the only correct answer.
Reference: Apache Spark 3.5 Documentation # Pandas API on Spark # Grouped Map Pandas UDFs (applyInPandas)

NEW QUESTION # 18
A developer is running Spark SQL queries and notices underutilization of resources. Executors are idle, and the number of tasks per stage is low.
What should the developer do to improve cluster utilization?

A. Enable dynamic resource allocation to scale resources as needed
B. Increase the size of the dataset to create more partitions
C. Increase the value of spark.sql.shuffle.partitions
D. Reduce the value of spark.sql.shuffle.partitions

Answer: C

Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
The number of tasks is controlled by the number of partitions. By default,spark.sql.shuffle.partitionsis 200. If stages are showing very few tasks (less than total cores), you may not be leveraging full parallelism.
From the Spark tuning guide:
"To improve performance, especially for large clusters, increasespark.sql.shuffle.partitionsto create more tasks and parallelism." Thus:
A is correct: increasing shuffle partitions increases parallelism
B is wrong: it further reduces parallelism
C is invalid: increasing dataset size doesn't guarantee more partitions D is irrelevant to task count per stage Final Answer: A

NEW QUESTION # 19
The following code fragment results in an error:
@F.udf(T.IntegerType())
def simple_udf(t: str) -> str:
return answer * 3.14159
Which code fragment should be used instead?

A. @F.udf(T.IntegerType())
def simple_udf(t: float) -> float:
return t * 3.14159
B. @F.udf(T.IntegerType())
def simple_udf(t: int) -> int:
return t * 3.14159
C. @F.udf(T.DoubleType())
def simple_udf(t: float) -> float:
return t * 3.14159
D. @F.udf(T.DoubleType())
def simple_udf(t: int) -> int:
return t * 3.14159

Answer: C

Explanation:
Comprehensive and Detailed Explanation:
The original code has several issues:
It references a variable answer that is undefined.
The function is annotated to return a str, but the logic attempts numeric multiplication.
The UDF return type is declared as T.IntegerType() but the function performs a floating-point operation, which is incompatible.
Option B correctly:
Uses DoubleType to reflect the fact that the multiplication involves a float (3.14159).
Declares the input as float, which aligns with the multiplication.
Returns a float, which matches both the logic and the schema type annotation.
This structure aligns with how PySpark expects User Defined Functions (UDFs) to be declared:
"To define a UDF you must specify a Python function and provide the return type using the relevant Spark SQL type (e.g., DoubleType for float results)." Example from official documentation:
from pyspark.sql.functions import udf
from pyspark.sql.types import DoubleType
@udf(returnType=DoubleType())
def multiply_by_pi(x: float) -> float:
return x * 3.14159
This makes Option B the syntactically and semantically correct choice.

NEW QUESTION # 20
An engineer notices a significant increase in the job execution time during the execution of a Spark job. After some investigation, the engineer decides to check the logs produced by the Executors.
How should the engineer retrieve the Executor logs to diagnose performance issues in the Spark application?

A. Fetch the logs by running a Spark job with thespark-sqlCLI tool.
B. Use the Spark UI to select the stage and view the executor logs directly from the stages tab.
C. Use the commandspark-submitwith the-verboseflag to print the logs to the console.
D. Locate the executor logs on the Spark master node, typically under the/tmpdirectory.

Answer: B

Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
The Spark UI is the standard and most effective way to inspect executor logs, task time, input size, and shuffles.
From the Databricks documentation:
"You can monitor job execution via the Spark Web UI. It includes detailed logs and metrics, including task- level execution time, shuffle reads/writes, and executor memory usage."
(Source: Databricks Spark Monitoring Guide) Option A is incorrect: logs are not guaranteed to be in/tmp, especially in cloud environments.
B).-verbosehelps during job submission but doesn't give detailed executor logs.
D).spark-sqlis a CLI tool for running queries, not for inspecting logs.
Hence, the correct method is using the Spark UI # Stages tab # Executor logs.

NEW QUESTION # 21
A data engineer wants to create an external table from a JSON file located at/data/input.jsonwith the following requirements:
Create an external table namedusers
Automatically infer schema
Merge records with differing schemas
Which code snippet should the engineer use?
Options:

A. CREATE EXTERNAL TABLE users USING json OPTIONS (path '/data/input.json')
B. CREATE EXTERNAL TABLE users USING json OPTIONS (path '/data/input.json', schemaMerge
'true')
C. CREATE TABLE users USING json OPTIONS (path '/data/input.json')
D. CREATE EXTERNAL TABLE users USING json OPTIONS (path '/data/input.json', mergeSchema
'true')

Answer: D

Explanation:
To create an external table and enable schema merging, the correct syntax is:
CREATEEXTERNALTABLEusers
USINGjson
OPTIONS (
path'/data/input.json',
mergeSchema'true'
)
mergeSchemais the correct option key (notschemaMerge)
EXTERNALallows Spark to query files without managing their lifecycle
Reference:Spark SQL DDL - JSON and Schema Merging

NEW QUESTION # 22
......

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