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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Apache Spark Architecture and Components | 20% | - Execution and deployment modes - Spark architecture overview - Shuffling, actions, and broadcasting - Execution hierarchy and lazy evaluation - Fault tolerance and garbage collection |
| Topic 2: Structured Streaming | 10% | - Fault tolerance and state management - Defining streaming queries - Output modes and triggers - Streaming concepts and architecture |
| Topic 3: Using Pandas API on Apache Spark | 5% | - Overview of Pandas API on Spark - Converting between Pandas and Spark structures - Key differences and limitations |
| Topic 4: Using Spark Connect to Deploy Applications | 5% | - Connecting to remote Spark clusters - Spark Connect architecture - Running applications via Spark Connect |
| Topic 5: Developing Apache Spark DataFrame API Applications | 30% | - Joining and combining datasets - Partitioning and bucketing data - Creating DataFrames and defining schemas - Selecting, renaming, and modifying columns - User-defined functions (UDFs) - Reading and writing data in various formats - Filtering, sorting, and aggregating data - Handling missing values and data quality |
| Topic 6: Using Spark SQL | 20% | - Running SQL queries - Working with functions and expressions - Using catalog and metadata APIs - Integrating Spark SQL with DataFrames |
| Topic 7: Troubleshooting and Tuning Apache Spark DataFrame API Applications | 10% | - Debugging and logging - Optimizing transformations and actions - Managing memory and resource usage - Identifying performance bottlenecks |
4 of 55.
A developer is working on a Spark application that processes a large dataset using SQL queries. Despite having a large cluster, the developer notices that the job is underutilizing the available resources. Executors remain idle for most of the time, and logs reveal that the number of tasks per stage is very low. The developer suspects that this is causing suboptimal cluster performance.
Which action should the developer take to improve cluster utilization?
Correct Answer: B 🗳️
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24 of 55.
Which code should be used to display the schema of the Parquet file stored in the location events.parquet?
Correct Answer: D 🗳️
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3 of 55. A data engineer observes that the upstream streaming source feeds the event table frequently and sends duplicate records. Upon analyzing the current production table, the data engineer found that the time difference in the event_timestamp column of the duplicate records is, at most, 30 minutes.
To remove the duplicates, the engineer adds the code:
df = df.withWatermark("event_timestamp", "30 minutes")
What is the result?
Correct Answer: D 🗳️
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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: A 🗳️
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A data scientist is analyzing a large dataset and has written a PySpark script that includes several transformations and actions on a DataFrame. The script ends with a collect() action to retrieve the results.
How does Apache Spark™'s execution hierarchy process the operations when the data scientist runs this script?
Correct Answer: B 🗳️
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