Real questions from top companies
Explain the concept of checkpointing in Spark and why it is important.
Explain the difference between batch and streaming data processing in Data Fusion.
Given a streaming dataset from Kafka, how would you ingest the data in real-time using Spark?
How do you drop columns with null values in PySpark?
How do you handle data skewness in Spark?
How do you optimize Spark jobs for performance?
How would you implement a sliding window aggregation in Spark Structured Streaming?
How would you read data from a web API using PySpark?
Implement a Spark job to find the top 10 most frequent words in a large text file.
What are the key components of the Spark execution model (Job, Stage, Task)?
What is Adaptive Query Execution (AQE) in Spark 3.x, and how does it improve performance?
What is Spark's Catalyst Optimizer? Explain its stages.
What is the difference between Spark RDDs, DataFrames, and Datasets?
What is the difference between repartition and coalesce in Spark?
What is the small-file problem in Spark, and how do you solve it?
When and how do you use Broadcast Join in Spark?
Write a Python function to find the first non-repeating character in a string.
What is broadcasting in Spark, and why is it used? Can you give an example of its use?
What is the difference between Managed and External Tables in Databricks?
What is the difference between map and flatMap in Spark, and when would you use each?
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