What is a hot key problem?
Practice this question from Quiz: Redis Cache Design for Interviews, with options and an explanation.
Question
What is a hot key problem?
Option A — Correct answer
One key receives disproportionate traffic and overloads a Redis node
Option B
A key has a long name
Option C
A key uses JSON
Option D
A key has no expiration timestamp
Explanation
Hot keys can bottleneck a single shard or node.