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| Section | Objectives |
|---|---|
| Data Ingestion and Storage | - Delta Lake basics - Reading and writing data (Parquet, JSON, CSV) |
| Apache Spark Fundamentals | - Spark architecture and execution model - RDD vs DataFrame vs Dataset concepts |
| Spark SQL | - SQL queries on DataFrames and tables - Window functions and aggregations |
| DataFrame API with PySpark | - Transformations and actions - Built-in functions and expressions - DataFrame creation and schema management |
| Data Processing and Performance | - Caching and persistence strategies - Optimization techniques - Joins and data partitioning |
| Structured Streaming Basics | - Streaming DataFrames - Windowed aggregations in streaming |
How can a Spark developer ensure optimal resource utilization when running Spark jobs in Local Mode for testing?
Options:
Correct Answer: C 🗳️
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35 of 55.
A data engineer is building a Structured Streaming pipeline and wants it to recover from failures or intentional shutdowns by continuing where it left off.
How can this be achieved?
Correct Answer: C 🗳️
Explanation: Only visible for TorrentValid members. You can sign-up / login (it's free).
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 the market_time field.
Which line of Spark code will produce a Parquet table that meets these requirements?
Correct Answer: A 🗳️
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48 of 55.
A data engineer needs to join multiple DataFrames and has written the following code:
from pyspark.sql.functions import broadcast
data1 = [(1, "A"), (2, "B")]
data2 = [(1, "X"), (2, "Y")]
data3 = [(1, "M"), (2, "N")]
df1 = spark.createDataFrame(data1, ["id", "val1"])
df2 = spark.createDataFrame(data2, ["id", "val2"])
df3 = spark.createDataFrame(data3, ["id", "val3"])
df_joined = df1.join(broadcast(df2), "id", "inner") \
.join(broadcast(df3), "id", "inner")
What will be the output of this code?
Correct Answer: C 🗳️
Explanation: Only visible for TorrentValid members. You can sign-up / login (it's free).
8 of 55.
A data scientist at a large e-commerce company needs to process and analyze 2 TB of daily customer transaction data. The company wants to implement real-time fraud detection and personalized product recommendations.
Currently, the company uses a traditional relational database system, which struggles with the increasing data volume and velocity.
Which feature of Apache Spark effectively addresses this challenge?
Correct Answer: B 🗳️
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