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Databricks Certified Associate Developer for Apache Spark 3.5 - Python Sample Questions (Q46-Q51):

NEW QUESTION # 46
Which Spark configuration controls the number of tasks that can run in parallel on the executor?
Options:

A. spark.executor.cores
B. spark.driver.cores
C. spark.executor.memory
D. spark.task.maxFailures

Answer: A

Explanation:
spark.executor.cores determines how many concurrent tasks an executor can run.
For example, if set to 4, each executor can run up to 4 tasks in parallel.
Other settings:
spark.task.maxFailures controls task retry logic.
spark.driver.cores is for the driver, not executors.
spark.executor.memory sets memory limits, not task concurrency.
Reference:Apache Spark Configuration

NEW QUESTION # 47
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
.orderBy("market_time")
.write
.format("parquet")
.mode("overwrite")
.saveAsTable("output.market_events")
B. final_df
.sort("market_time")
.write
.format("parquet")
.mode("overwrite")
.saveAsTable("output.market_events")
C. final_df
.sort("market_time")
.coalesce(1)
.write
.format("parquet")
.mode("overwrite")
.saveAsTable("output.market_events")
D. final_df
.sortWithinPartitions("market_time")
.write
.format("parquet")
.mode("overwrite")
.saveAsTable("output.market_events")

Answer: D

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 # 48
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", path="/some/path")
B. users.write.option("path", "/some/path").saveAsTable("default_table")
C. users.write.saveAsTable("default_table").option("path", "/some/path")
D. users.write(path="/some/path").saveAsTable("default_table")

Answer: B

Explanation:
To persist a table and specify the save path, use:
users.write.option("path","/some/path").saveAsTable("default_table")
The .option("path", ...) must be applied before calling saveAsTable.
Option A uses invalid syntax (write(path=...)).
Option B applies.option()after.saveAsTable()-which is too late.
Option D uses incorrect syntax (no path parameter in saveAsTable).
Reference:Spark SQL - Save as Table

NEW QUESTION # 49
Given:
python
CopyEdit
spark.sparkContext.setLogLevel("<LOG_LEVEL>")
Which set contains the suitable configuration settings for Spark driver LOG_LEVELs?

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

Answer: D

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 # 50
A developer wants to refactor some older Spark code to leverage built-in functions introduced in Spark 3.5.0.
The existing code performs array manipulations manually. Which of the following code snippets utilizes new built-in functions in Spark 3.5.0 for array operations?

A)

B)

C)

D)

A. result_df = prices_df
.agg(F.min("spot_price"), F.max("spot_price"))
B. result_df = prices_df
.agg(F.count_if(F.col("spot_price") >= F.lit(min_price)))
C. result_df = prices_df
.withColumn("valid_price", F.when(F.col("spot_price") > F.lit(min_price), 1).otherwise(0))
D. result_df = prices_df
.agg(F.count("spot_price").alias("spot_price"))
.filter(F.col("spot_price") > F.lit("min_price"))

Answer: B

Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
The correct answer isBbecause it uses the new function count_if, introduced in Spark 3.5.0, which simplifies conditional counting within aggregations.
* F.count_if(condition) counts the number of rows that meet the specified boolean condition.
* In this example, it directly counts how many times spot_price >= min_price evaluates to true, replacing the older verbose combination of when/otherwise and filtering or summing.
Official Spark 3.5.0 documentation notes the addition of count_if to simplify this kind of logic:
"Added count_if aggregate function to count only the rows where a boolean condition holds (SPARK-
43773)."
Why other options are incorrect or outdated:
* Auses a legacy-style method of adding a flag column (when().otherwise()), which is verbose compared to count_if.
* Cperforms a simple min/max aggregation-useful but unrelated to conditional array operations or the updated functionality.
* Dincorrectly applies .filter() after .agg() which will cause an error, and misuses string "min_price" rather than the variable.
Therefore,Bis the only option leveraging new functionality from Spark 3.5.0 correctly and efficiently.

NEW QUESTION # 51
......

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