System design interview question
"Explain and design consistent hashing. Suppose you have a set of servers and a stream of keys, and servers are added and removed over time. Show me the data structure, the algorithms, and what problems it does and does not solve."
A focused algorithms-and-data-structures question inside a systems interview. Because the scope is narrow, there is nowhere to hide — the candidate either understands the ring, virtual nodes, and the actual guarantees, or they are repeating a phrase. The best signal is whether they know what consistent hashing fails to solve.
On Practick another engineer interviews you live for 60 minutes on a question from this bank. They have the full interviewer guide beside the call: the answers to your clarifying questions, the numbers to hand out, a ladder of follow-ups and a scoring rubric. You get the model solution once the session settles. It is free: interview someone for an hour and you have earned your own.
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