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| Section | Objectives |
|---|---|
| DataFrame API with PySpark | - Transformations and actions - DataFrame creation and schema management - Built-in functions and expressions |
| Apache Spark Fundamentals | - RDD vs DataFrame vs Dataset concepts - Spark architecture and execution model |
| Data Processing and Performance | - Caching and persistence strategies - Optimization techniques - Joins and data partitioning |
| Spark SQL | - SQL queries on DataFrames and tables - Window functions and aggregations |
| Structured Streaming Basics | - Streaming DataFrames - Windowed aggregations in streaming |
| Data Ingestion and Storage | - Delta Lake basics - Reading and writing data (Parquet, JSON, CSV) |
1. 15 of 55.
A data engineer is working on a Streaming DataFrame (streaming_df) with the following streaming data:
id
name
count
timestamp
1
Delhi
20
2024-09-19T10:11
1
Delhi
50
2024-09-19T10:12
2
London
50
2024-09-19T10:15
3
Paris
30
2024-09-19T10:18
3
Paris
20
2024-09-19T10:20
4
Washington
10
2024-09-19T10:22
Which operation is supported with streaming_df?
A) streaming_df.count()
B) streaming_df.select(countDistinct("name"))
C) streaming_df.filter("count < 30")
D) streaming_df.show()
2. What is the risk associated with this operation when converting a large Pandas API on Spark DataFrame back to a Pandas DataFrame?
A) The conversion will automatically distribute the data across worker nodes
B) The operation will fail if the Pandas DataFrame exceeds 1000 rows
C) The operation will load all data into the driver's memory, potentially causing memory overflow
D) Data will be lost during conversion
3. What is a feature of Spark Connect?
A) Supports DataFrame, Functions, Column, SparkContext PySpark APIs
B) It supports DataStreamReader, DataStreamWriter, StreamingQuery, and Streaming APIs
C) It supports only PySpark applications
D) It has built-in authentication
4. A data engineer is streaming data from Kafka and requires:
Minimal latency
Exactly-once processing guarantees
Which trigger mode should be used?
A) .trigger(continuous=True)
B) .trigger(availableNow=True)
C) .trigger(processingTime='1 second')
D) .trigger(continuous='1 second')
5. 5 of 55.
What is the relationship between jobs, stages, and tasks during execution in Apache Spark?
A) A stage contains multiple tasks, and each task contains multiple jobs.
B) A stage contains multiple jobs, and each job contains multiple tasks.
C) A job contains multiple stages, and each stage contains multiple tasks.
D) A job contains multiple tasks, and each task contains multiple stages.
Solutions:
| Question # 1 Answer: C | Question # 2 Answer: C | Question # 3 Answer: B | Question # 4 Answer: C | Question # 5 Answer: C |
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