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Why is random load balancing better than sequential?

What problem might arise if shards are selected in an order (sequentially) rather than randomly?

Answers include:
A) The write request queue increases
B) Maximum shard utilization decreases
D) The user will not get quick responses

What’s the reason behind these issues?


Course: Grokking Modern System Design Interview for Engineers & Managers - AI-Powered Learning for Developers
Lesson: https://www.educative.io/courses/grokking-modern-system-design-interview-for-engineers-managers/quiz-on-the-sharded-counters-design