Describe the difference between Spark RDDs, DataFrames, and Datasets.
Spark/Big Datahard
2
How does Spark's Catalyst Optimizer work? Explain its stages.
Spark/Big Datahard
3
How do you optimize Spark jobs for better performance? Mention at least 5 techniques.
Spark/Big Datahard
4
Describe the data pipeline architecture you've worked with.
System Design/Architecturehard
5
What is the difference between OLTP and OLAP?
General/Otherhard
6
Design an anti-skew strategy for a join on a high-cardinality key with a long-tail distribution (e.g., a few keys hold 80% of rows). Cover salting, split-skew, AQE, and cost/operational trade-offs.
Spark/Big Datahard
7
Explain the benefits of using DataFrames over RDDs.
Spark/Big Datahard
8
How do you optimize Spark jobs for performance?
Spark/Big Datahard
+20 More Questions with Expert Answers
Get the complete 1,800+ question library with detailed, expert-level answers covering SQL, Spark, System Design, Python, Cloud, and Behavioral topics.