Welcome to your interview.
The question is on your right: RDD Lineage and Recovery. 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 concept of resilient distributed datasets (RDDs) and how lineage allows them to recover from node failures.