FAANG / Big Tech interview question · Most asked
What is consistent hashing and why use it?
Summary
Maps keys and nodes onto a ring so adding/removing nodes moves only a fraction of keys; used for caches and sharded stores.
Longer Answer
Maps keys and nodes onto a ring so adding/removing nodes moves only a fraction of keys; used for caches and sharded stores. Scaling storage/cache fleets.
Key Points
- Maps keys and nodes onto a ring so adding/removing nodes moves only a fraction of keys; used for caches and sharded stores
- Scaling storage/cache fleets
- Relevant areas: Distributed Systems, Hashing
- Use the answer to connect the concept back to a realistic production or interview scenario for 'What is consistent hashing and why use it?'
Comparison / Tradeoffs
| Aspect | Notes |
|---|---|
| Core idea | Maps keys and nodes onto a ring so adding/removing nodes moves only a fraction of keys; used for caches and sharded stores. |
| Practical tradeoff | Scaling storage/cache fleets. |
Explanation
Summary
Scaling storage/cache fleets.
Longer Answer
Scaling storage/cache fleets. Focus on the practical implications across Distributed Systems, Hashing.
Key Points
- Scaling storage/cache fleets
- Focus on the practical implications across Distributed Systems, Hashing
- Relevant areas: Distributed Systems, Hashing
- Use the answer to connect the concept back to a realistic production or interview scenario for 'What is consistent hashing and why use it?'
Comparison / Tradeoffs
| Aspect | Notes |
|---|---|
| Core idea | Scaling storage/cache fleets. |
| Practical tradeoff | In an interview, relate 'What is consistent hashing and why use it?' to implementation decisions, tradeoffs, and operational impact. |
More most-asked FAANG / Big Tech questions
- Walk through time/space complexity of two-sum approaches.
- Explain BFS vs DFS and when to use each.
- Explain LRU cache design.
- What is dynamic programming? Give an interview example.
- Tell me about a time you disagreed with a technical decision.
- Tell me about a time you took ownership of a production issue.
- What happens when you type a URL in a browser?
- Explain CAP theorem and when you choose AP vs CP.