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Databricks Certified Associate Developer for Apache Spark 3.5 - Python Sample Questions (Q12-Q17):

NEW QUESTION # 12
A data engineer is reviewing a Spark application that applies several transformations to a DataFrame but notices that the job does not start executing immediately.
Which two characteristics of Apache Spark's execution model explain this behavior?
Choose 2 answers:

A. The Spark engine requires manual intervention to start executing transformations.
B. Only actions trigger the execution of the transformation pipeline.
C. The Spark engine optimizes the execution plan during the transformations, causing delays.
D. Transformations are executed immediately to build the lineage graph.
E. Transformations are evaluated lazily.

Answer: B,E

Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
Apache Spark employs a lazy evaluation model for transformations. This means that when transformations (e.
g.,map(),filter()) are applied to a DataFrame, Spark does not execute them immediately. Instead, it builds a logical plan (lineage) of transformations to be applied.
Execution is deferred until an action (e.g.,collect(),count(),save()) is called. At that point, Spark's Catalyst optimizer analyzes the logical plan, optimizes it, and then executes the physical plan to produce the result.
This lazy evaluation strategy allows Spark to optimize the execution plan, minimize data shuffling, and improve overall performance by reducing unnecessary computations.

NEW QUESTION # 13
A data engineer is working on the DataFrame:

(Referring to the table image: it has columnsId,Name,count, andtimestamp.) Which code fragment should the engineer use to extract the unique values in theNamecolumn into an alphabetically ordered list?

A. df.select("Name").distinct()
B. df.select("Name").distinct().orderBy(df["Name"])
C. df.select("Name").orderBy(df["Name"].asc())
D. df.select("Name").distinct().orderBy(df["Name"].desc())

Answer: B

Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
To extract unique values from a column and sort them alphabetically:
distinct()is required to remove duplicate values.
orderBy()is needed to sort the results alphabetically (ascending by default).
Correct code:
df.select("Name").distinct().orderBy(df["Name"])
This is directly aligned with standard DataFrame API usage in PySpark, as documented in the official Databricks Spark APIs. Option A is incorrect because it may not remove duplicates. Option C omits sorting.
Option D sorts in descending order, which doesn't meet the requirement for alphabetical (ascending) order.

NEW QUESTION # 14
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. Locate the executor logs on the Spark master node, typically under the/tmpdirectory.
B. Fetch the logs by running a Spark job with thespark-sqlCLI tool.
C. Use the Spark UI to select the stage and view the executor logs directly from the stages tab.
D. Use the commandspark-submitwith the-verboseflag to print the logs to the console.

Answer: C

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 # 15
A data engineer has been asked to produce a Parquet table which is overwritten every day with the latest data.
The downstream consumer of this Parquet table has a hard requirement that the data in this table is produced with all records sorted by themarket_timefield.
Which line of Spark code will produce a Parquet table that meets these requirements?

A. final_df
.sort("market_time")
.write
.format("parquet")
.mode("overwrite")
.saveAsTable("output.market_events")
B. final_df
.sortWithinPartitions("market_time")
.write
.format("parquet")
.mode("overwrite")
.saveAsTable("output.market_events")
C. final_df
.orderBy("market_time")
.write
.format("parquet")
.mode("overwrite")
.saveAsTable("output.market_events")
D. final_df
.sort("market_time")
.coalesce(1)
.write
.format("parquet")
.mode("overwrite")
.saveAsTable("output.market_events")

Answer: B

Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
To ensure that data written out to disk is sorted, it is important to consider how Spark writes data when saving to Parquet tables. The methods.sort()or.orderBy()apply a global sort but do not guarantee that the sorting will persist in the final output files unless certain conditions are met (e.g. a single partition via.coalesce(1)- which is not scalable).
Instead, the proper method in distributed Spark processing to ensure rows are sorted within their respective partitions when written out is:
sortWithinPartitions("column_name")
According to Apache Spark documentation:
"sortWithinPartitions()ensures each partition is sorted by the specified columns. This is useful for downstream systems that require sorted files." This method works efficiently in distributed settings, avoids the performance bottleneck of global sorting (as in.orderBy()or.sort()), and guarantees each output partition has sorted records - which meets the requirement of consistently sorted data.
Thus:
Option A and B do not guarantee the persisted file contents are sorted.
Option C introduces a bottleneck via.coalesce(1)(single partition).
Option D correctly applies sorting within partitions and is scalable.
Reference: Databricks & Apache Spark 3.5 Documentation # DataFrame API # sortWithinPartitions()

NEW QUESTION # 16
A data engineer is building a Structured Streaming pipeline and wants the pipeline to recover from failures or intentional shutdowns by continuing where the pipeline left off.
How can this be achieved?

A. By configuring the optioncheckpointLocationduringreadStream
B. By configuring the optioncheckpointLocationduringwriteStream
C. By configuring the optionrecoveryLocationduringwriteStream
D. By configuring the optionrecoveryLocationduring the SparkSession initialization

Answer: B

Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
To enable a Structured Streaming query to recover from failures or intentional shutdowns, it is essential to specify thecheckpointLocationoption during thewriteStreamoperation. This checkpoint location stores the progress information of the streaming query, allowing it to resume from where it left off.
According to the Databricks documentation:
"You must specify thecheckpointLocationoption before you run a streaming query, as in the following example:
option("checkpointLocation", "/path/to/checkpoint/dir")
toTable("catalog.schema.table")
- Databricks Documentation: Structured Streaming checkpoints
By setting thecheckpointLocationduringwriteStream, Spark can maintain state information and ensure exactly- once processing semantics, which are crucial for reliable streaming applications.

NEW QUESTION # 17
......

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