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Design Thread-Safe Cache with TTL
Last Updated: February 4, 2026
Ashish Pratap Singh
High Priority
medium
15 min read
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1. Problem Definition
2. System Overview
3. Concurrency Challenges
Challenge 1: Stale Read Race
Challenge 2: Put-Cleanup Race
Challenge 3: Concurrent Put Race
Challenge 4: Read During Modification
State Machine
4. Synchronization Strategy
Approach 1: Coarse-Grained Locking
Approach 2: Thread-Safe Map with Lazy Cleanup
Approach 3: ConcurrentHashMap with Background Clea...
5. Implementation
6. Sequence Diagram
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