Consistent Hashing Ring with Virtual Nodes for Shard Rebalancing

Company: OpenAI

Role: Software Engineer

Category: Coding & Algorithms

Difficulty: hard

Interview Round: Technical Screen

Quick Answer: This question evaluates a candidate's ability to design and implement a consistent hashing ring with virtual nodes for distributing keys across shards. It tests knowledge of hash-based data structures, minimal-movement rebalancing, and precise algorithmic implementation under tie-breaking and complexity constraints, commonly asked in coding interviews for distributed systems roles.