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最新的 Databricks Certification Associate-Developer-Apache-Spark 免費考試真題:
1. Which of the following code blocks returns a DataFrame that matches the multi-column DataFrame itemsDf, except that integer column itemId has been converted into a string column?
A) itemsDf.withColumn("itemId", col("itemId").cast("string"))
(Correct)
B) spark.cast(itemsDf, "itemId", "string")
C) itemsDf.withColumn("itemId", convert("itemId", "string"))
D) itemsDf.select(cast("itemId", "string"))
E) itemsDf.withColumn("itemId", col("itemId").convert("string"))
2. Which of the following statements about Spark's configuration properties is incorrect?
A) The maximum number of tasks that an executor can process at the same time is controlled by the spark.executor.cores property.
B) The default number of partitions returned from certain transformations can be controlled by the spark.default.parallelism property.
C) The default value for spark.sql.autoBroadcastJoinThreshold is 10MB.
D) The maximum number of tasks that an executor can process at the same time is controlled by the spark.task.cpus property.
E) The default number of partitions to use when shuffling data for joins or aggregations is 300.
3. Which of the following describes characteristics of the Spark UI?
A) Some of the tabs in the Spark UI are named Jobs, Stages, Storage, DAGs, Executors, and SQL.
B) The Scheduler tab shows how jobs that are run in parallel by multiple users are distributed across the cluster.
C) Via the Spark UI, workloads can be manually distributed across executors.
D) There is a place in the Spark UI that shows the property spark.executor.memory.
E) Via the Spark UI, stage execution speed can be modified.
4. Which of the following describes the conversion of a computational query into an execution plan in Spark?
A) The executed physical plan depends on a cost optimization from a previous stage.
B) Spark uses the catalog to resolve the optimized logical plan.
C) Depending on whether DataFrame API or SQL API are used, the physical plan may differ.
D) The catalog assigns specific resources to the physical plan.
E) The catalog assigns specific resources to the optimized memory plan.
5. The code block shown below should convert up to 5 rows in DataFrame transactionsDf that have the value 25 in column storeId into a Python list. Choose the answer that correctly fills the blanks in the code block to accomplish this.
Code block:
transactionsDf.__1__(__2__).__3__(__4__)
A) 1. select
2. storeId==25
3. head
4. 5
B) 1. filter
2. col("storeId")==25
3. take
4. 5
C) 1. filter
2. col("storeId")==25
3. collect
4. 5
D) 1. filter
2. col("storeId")==25
3. toLocalIterator
4. 5
E) 1. filter
2. "storeId"==25
3. collect
4. 5
問題與答案:
問題 #1 答案: A | 問題 #2 答案: E | 問題 #3 答案: D | 問題 #4 答案: A | 問題 #5 答案: B |
1.39.60.* -
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