Welcome to your interview.
The question is on your right: Optimizing Spark Joins. Take a moment with it first.
Talk your thinking through with me if you like - when you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes). Discussion and graded submissions share your five interviewer interactions, so spend them well.
Explain the architecture of Apache Spark. How does it handle data partitioning, and how would you optimize a join operation between a massive event table and a small metadata table at Klaviyo?