Multiple ChoiceBeginner 45s
Cache penetration
What is 'cache penetration' in a high-traffic system?
Options
- 1The cache slowly leaks memory as entries accumulate, eventually causing an OOM that forces frequent process restarts
- 2The cache evicts hot keys because of capacity pressure, so frequently requested data keeps getting thrown out prematurely
- 3Requests for keys that exist in neither cache nor DB keep bypassing the cache and hammering the DB
- 4A malicious user fills the cache with junk keys to evict legitimate entries and degrade hit rates for real traffic
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