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Backend Engineering
1 / 12
Caching & Performance
Advanced
Many keys share the exact same TTL and expire simultaneously, causing a flood of backend fetches. What is this problem and a standard mitigation?
A
Hot key; mitigate by sharding the key across nodes
B
Cache stampede; mitigate by lowering the connection timeout
C
Cache penetration; mitigate with a bloom filter
D
Cache avalanche; mitigate by adding random jitter to TTLs
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