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Caching: System Design: Uncharted

Courses System DesignCaching

CachingPro

Place fast copies close to demand while controlling staleness, key safety, and stampedes.

System Design
Unit 3 of 12
20 lessons
154 min
420 XP

This unit is part of Pro. Upgrade to open every lesson in it.

Lessons

20 total

1The Kitchen CounterEvaluate a cache candidate from reuse frequency, fetch cost, and the harm of serving an older copy.ProInteractiveConcept7 min20 XPOpen
2Hit or MissDistinguish the short hit path from a miss that pays both lookup and source-fetch costs.ProInteractiveConcept7 min20 XPOpen
3Napkin: Hit RateCompute expected read latency by weighting cache-hit and cache-miss paths by their frequencies.ProInteractiveConcept7 min20 XPOpen
4Layers of CloseLocate browser, edge, application, and database caches by which consumers they place data near.ProInteractiveConcept7 min20 XPOpen
5Cache-Aside, DrawnTrace both branches of cache-aside so a miss fetches durable data and fills the cache before returning.ProDiagramConcept10 min20 XPOpen
6The Egg TimerSet cache lifetime by balancing tolerated staleness against refresh load on the source.ProInteractiveConcept7 min20 XPOpen
7Stale and OkayJudge whether stale data is acceptable from the product consequence of acting on an old value.ProInteractiveConcept7 min20 XPOpen
8The Forgotten CacheTrace a stale read back to the write path that failed to update or invalidate its cached copy.ProInteractiveConcept7 min20 XPOpen
9Write-Through or AsideChoose cache-aside, write-through, or a bounded TTL from the workload’s read pattern and freshness needs.ProInteractiveConcept7 min20 XPOpen
10The StampedeRecognize how simultaneous misses for one hot key can multiply load on the source of truth.ProInteractiveConcept7 min20 XPOpen
11Stampede DefensesExplain how expiry jitter, request coalescing, and refresh-ahead each reduce synchronized source work.ProInteractiveConcept7 min20 XPOpen
12What Not to CacheReject cache designs whose stale or over-broad entries threaten authorization, money, privacy, or usefulness.ProInteractiveConcept7 min20 XPOpen
13The Edge of the WorldModel static delivery in which a nearby CDN serves hits and fetches misses from the origin.ProDiagramConcept10 min20 XPOpen
14Cache KeysBuild cache keys from every request input that can change the response, including identity and version.ProInteractiveConcept7 min20 XPOpen
15Read the Hit-Rate ChartDetect the first sustained hit-rate collapse without mistaking one noisy sample for a trend.ProInteractiveConcept8 min20 XPOpen
16Making RoomApply least-recently-used eviction by comparing when each cached entry was last touched.ProInteractiveConcept7 min20 XPOpen
17Cache the BakeryDesign separate edge and application cache seams while preserving the bakery database as source of truth.ProDiagramProject10 min20 XPOpen
18Napkin: Cache SizingEstimate the hot set in decimal gigabytes and express its capacity as the nearest logarithmic power of ten.ProInteractiveConcept7 min20 XPOpen
19Explain Cache-AsideExplain who fills and invalidates a cache-aside copy and where its stale-read window comes from.ProInteractiveConcept8 min20 XPOpen
20Caching Mastery CheckCombine edge delivery, cached reads, durable writes, and explicit invalidation into one coherent architecture.ProDiagramMastery check10 min40 XPOpen

Scaling Out Databases at Scale