Wiki Article · Cinematic

Cache Invalidation

Yeh article cache invalidation ka complete guide hai — cached data ko remove ya update karna jab…

Overview

Cache Invalidation — Quick Facts

📌

Property: Detail

🎯

Topic: Cache Invalidation

⚡

Category: Infrastructure / Caching / Server…

🔑

Definition: Cached data ko remove/update karna…

Topic 1

Infobox

📚 | Property | Detail | |---|---| | Topic | Cache Invalidation | | Category |…

Topic 2

What Is Cache Invalidation?

💡

Invalidation: Purani chit phenko /…

🔑

Update: Chit pe naya number likho…

⚡

No invalidation: Purane number pe…

Topic 3

Why Cache Invalidation Is Hard

🎯 The Fundamental Trade-off ` Freshness ←————————→ Performance (always latest data) (always…

Topic 4

Invalidation Strategies

💡

Simple implementation

🔑

Self-healing (stale data…

⚡

No event system needed

🎯

Stale window = up to TTL duration

Topic 5

Invalidation Methods

🔑 Method Comparison | Method | Granularity | Use Case | |---|---|---| | Purge | Single…

Topic 6

HTTP Cache Invalidation

💡

Data unchanged → 304 Not Modified…

🔑

Data changed → 200 OK + new ETag +…

Topic 7

CDN Invalidation

💡

Purge request → PoPs worldwide me…

🔑

During propagation: some edges…

⚡

Most CDNs: purge requests limited…

🎯

CloudFront: 1000+ paths/month =…

Topic 8

Browser Cache Busting

💡

Content change → hash change → new…

🔑

Content same → hash same → browser…

⚡

Long Cache-Control:…

🎯

No stale data ever — new content =…

Topic 9

Redis Invalidation

💡

Session expiry notification

🔑

Cache miss trigger for pre-warming

⚡

Audit/logging of invalidation…

Topic 10

Cache Stampede on Invalidation

💡 The Problem ` Popular key (1M requests/min) → cache expires/invalidated → Suddenly ALL…

Topic 11

Distributed Cache Invalidation

🎯 The Challenge ` Server A, B, C → each has local cache Server A updates DB → Server A…

Topic 12

Invalidation Flow — Mermaid Diagram

⭐ `mermaid flowchart TD WRITE["Data Write / Update"] DB["Database Updated"] EVENT["Fire…

Topic 13

Common Mistakes

💡

Hit rate drastically drops

🔑

Origin overloaded (all requests =…

⚡

Cache stampede risk

🎯

Performance worse than no cache

Topic 14

Best Practices

✨ 1. Event-Driven + TTL Safety Net Primary invalidation event-driven rakho (data change →…

Topic 15

Interview Perspective

🌟 Q1: Cache invalidation kyun mushkil hai aur kaunsi strategies commonly use hoti hain? A:…

Topic 16

Glossary

🚀 | Term | Definition | |---|---| | Cache invalidation | Cached data remove/update karna…

Diagram

Visual Flow

📊 Diagram visualization — details in narration

Quiz — Question 1

Cache Invalidation ka sabse sahi definition kya hai?

Quick Quiz

Quiz — Question 2

Cache Invalidation ka 'Topic' kya hai?

Complete! 🎉

Cache Invalidation Complete!

Aliens Wiki · HIEN · Cinematic Knowledge

✅