Welcome to your interview.
The question is on your right: Hadoop and Spark Performance. 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 Hadoop and Spark, detailing how data partitioning and shuffling impact job performance.