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Databricks Certified Associate Developer for Apache Spark 3.5 - Python Sample Questions (Q74-Q79):

NEW QUESTION # 74
Given:
python
CopyEdit
spark.sparkContext.setLogLevel("<LOG_LEVEL>")
Which set contains the suitable configuration settings for Spark driver LOG_LEVELs?

A. FATAL, NONE, INFO, DEBUG
B. ERROR, WARN, TRACE, OFF
C. ALL, DEBUG, FAIL, INFO
D. WARN, NONE, ERROR, FATAL

Answer: B

Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
ThesetLogLevel()method ofSparkContextsets the logging level on the driver, which controls the verbosity of logs emitted during job execution. Supported levels are inherited from log4j and include the following:
ALL
DEBUG
ERROR
FATAL
INFO
OFF
TRACE
WARN
According to official Spark and Databricks documentation:
"Valid log levels include: ALL, DEBUG, ERROR, FATAL, INFO, OFF, TRACE, and WARN." Among the choices provided, only option B (ERROR, WARN, TRACE, OFF) includes four valid log levels and excludes invalid ones like "FAIL" or "NONE".
Reference: Apache Spark API docs # SparkContext.setLogLevel

NEW QUESTION # 75
A data scientist is working on a project that requires processing large amounts of structured data, performing SQL queries, and applying machine learning algorithms. The data scientist is considering using Apache Spark for this task.
Which combination of Apache Spark modules should the data scientist use in this scenario?
Options:

A. Spark Streaming, GraphX, and Pandas API on Spark
B. Spark DataFrames, Structured Streaming, and GraphX
C. Spark DataFrames, Spark SQL, and MLlib
D. Spark SQL, Pandas API on Spark, and Structured Streaming

Answer: C

Explanation:
Comprehensive Explanation:
To cover structured data processing, SQL querying, and machine learning in Apache Spark, the correct combination of components is:
Spark DataFrames: for structured data processing
Spark SQL: to execute SQL queries over structured data
MLlib: Spark's scalable machine learning library
This trio is designed for exactly this type of use case.
Why other options are incorrect:
A: GraphX is for graph processing - not needed here.
B: Pandas API on Spark is useful, but MLlib is essential for ML, which this option omits.
C: Spark Streaming is legacy; GraphX is irrelevant here.
Reference:Apache Spark Modules Overview

NEW QUESTION # 76
A data engineer observes that an upstream streaming source sends duplicate records, where duplicates share the same key and have at most a 30-minute difference inevent_timestamp. The engineer adds:
dropDuplicatesWithinWatermark("event_timestamp", "30 minutes")
What is the result?

A. It removes duplicates that arrive within the 30-minute window specified by the watermark
B. It removes all duplicates regardless of when they arrive
C. It accepts watermarks in seconds and the code results in an error
D. It is not able to handle deduplication in this scenario

Answer: A

Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
The methoddropDuplicatesWithinWatermark()in Structured Streaming drops duplicate records based on a specified column and watermark window. The watermark defines the threshold for how late data is considered valid.
From the Spark documentation:
"dropDuplicatesWithinWatermark removes duplicates that occur within the event-time watermark window." In this case, Spark will retain the first occurrence and drop subsequent records within the 30-minute watermark window.
Final Answer: B

NEW QUESTION # 77
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: int) -> int:
return t * 3.14159
B. @F.udf(T.DoubleType())
def simple_udf(t: float) -> float:
return t * 3.14159
C. @F.udf(T.DoubleType())
def simple_udf(t: int) -> int:
return t * 3.14159
D. @F.udf(T.IntegerType())
def simple_udf(t: float) -> float:
return t * 3.14159

Answer: B

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 # 78
An engineer has a large ORC file located at/file/test_data.orcand wants to read only specific columns to reduce memory usage.
Which code fragment will select the columns, i.e.,col1,col2, during the reading process?

A. spark.read.orc("/file/test_data.orc").selected("col1", "col2")
B. spark.read.orc("/file/test_data.orc").filter("col1 = 'value' ").select("col2")
C. spark.read.format("orc").select("col1", "col2").load("/file/test_data.orc")
D. spark.read.format("orc").load("/file/test_data.orc").select("col1", "col2")

Answer: D

Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
The correct way to load specific columns from an ORC file is to first load the file using.load()and then apply.
select()on the resulting DataFrame. This is valid with.read.format("orc")or the shortcut.read.orc().
df = spark.read.format("orc").load("/file/test_data.orc").select("col1","col2") Why others are incorrect:
Aperforms selection after filtering, but doesn't match the intention to minimize memory at load.
Bincorrectly tries to use.select()before.load(), which is invalid.
Cuses a non-existent.selected()method.
Dcorrectly loads and then selects.
Reference:Apache Spark SQL API - ORC Format

NEW QUESTION # 79
......

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