#Idempotency Request

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#Idempotency Request Reel by @codewithmukul (verified account) - Comment "Design" I will send you the blog link
Idempotent API in System Design explained step by step:
• Problem
Network retries and double clicks can
7.9K
CO
@codewithmukul
Comment "Design" I will send you the blog link Idempotent API in System Design explained step by step: • Problem Network retries and double clicks can create duplicate orders or payments • Add Idempotency-Key Client sends a unique Idempotency-Key in request headers Same operation = same key • Server check Backend checks Redis or DB for the Idempotency-Key • Return cached response If key exists, return stored response Do not process again • Process only once If key does not exist, execute business logic once • Store result Store key, request hash, response, and status code • Handle concurrent retries Use Redis SETNX or DB unique constraint • Set expiry Use TTL to clean old idempotency keys • Secure usage Reject same key with different payload • Real use cases Payments, orders, bookings, webhooks [ idempotent api, system design, backend engineering, api design, post idempotency, retry mechanism, distributed systems, redis, microservices, interview prep, backend developer, scalability, reliability] #systemdesign #java #programming #dsa #softwareengineer
#Idempotency Request Reel by @unipro.code - Ye .NET + OOP + System Design interviews ka super common question hai
Dependency Injection (DI) is a design pattern used to provide dependencies from
97
UN
@unipro.code
Ye .NET + OOP + System Design interviews ka super common question hai Dependency Injection (DI) is a design pattern used to provide dependencies from outside instead of creating them inside a class. 1️⃣ Removes tight coupling Class directly object create nahi karta. Dependencies bahar se milti hain. 2️⃣ Improves testability Mocks/Stubs easily inject kar sakte ho during unit testing. 3️⃣ Better maintainability Change implementation without modifying the main class. 4️⃣ Follows SOLID principles Supports Dependency Inversion and clean architecture. 5️⃣ Built-in support in modern frameworks Frameworks like ASP.NET Core provide DI container by default. 👉 Simple rule: Don’t create dependencies. Inject them. #DependencyInjection #DotNet #OOPS #Backend #foryou
#Idempotency Request Reel by @dhruvtechbytes (verified account) - Your DB is slow…
But the bug isn't in your query.

Comment PDF to get detailed notes.

It's your Primary Key 👀

Using random UUIDs in MySQL can silen
244.9K
DH
@dhruvtechbytes
Your DB is slow… But the bug isn’t in your query. Comment PDF to get detailed notes. It’s your Primary Key 👀 Using random UUIDs in MySQL can silently destroy performance: ❌ Random inserts ❌ Page splits ❌ Index fragmentation ❌ CPU spikes under load InnoDB stores data using B+ Trees. And random UUIDs = random tree writes = production pain. Before choosing UUID as PK… understand the storage engine. #systemdesign #database #tech #engineers #developers [Tech, software engineers, databases, Engineering, mysql]
#Idempotency Request Reel by @saurabh.devtalks - Confused between dependencies and devDependencies in package.json? 🤔

Dependencies are the packages your app needs to run in production.
Example: Rea
8.2K
SA
@saurabh.devtalks
Confused between dependencies and devDependencies in package.json? 🤔 Dependencies are the packages your app needs to run in production. Example: React, Express. DevDependencies are only needed during development. Example: ESLint, Jest. Simple rule 👇 If your app needs it to run → dependency. If you need it to build/test → devDependency. Save this for interviews #webdevelopment #javascript #nodejs #reactjs #angular
#Idempotency Request Reel by @enoughtoship - Transaction stops half writes. Idempotency stops double payments.

Go for more info in the pinned comment.

software engineer tips | developer jargon
33.4K
EN
@enoughtoship
Transaction stops half writes. Idempotency stops double payments. Go for more info in the pinned comment. software engineer tips | developer jargon explained | tech career growth | enough to ship | backend development | system design for beginners | transaction vs idempotent | payment API design | database transactions | idempotent API | idempotency key | API reliability #softwareengineering #backenddeveloper #systemdesign #techcareer
#Idempotency Request Reel by @chhavi_maheshwari_ - Handling 1 Million RPS isn't about code - it's about smart architecture.

1️⃣ Traffic Distribution (Load Balancers)
➡️ Spreads incoming requests acros
909.7K
CH
@chhavi_maheshwari_
Handling 1 Million RPS isn’t about code — it’s about smart architecture. 1️⃣ Traffic Distribution (Load Balancers) ➡️ Spreads incoming requests across many servers so nothing overloads. Example: 1M requests split across 200 servers = ~5K requests per server. ⸻ 2️⃣ Scale Out, Not Up (Horizontal Scaling) ➡️ Add more machines instead of making one server bigger. Example: Flash sale traffic? Instantly launch 50 new API instances. ⸻ 3️⃣ Fast Reads with Cache ➡️ Use Redis/Memcached to avoid hitting the database every time. Example: Cached user data = millions of DB calls saved daily. ⸻ 4️⃣ Edge Delivery with CDN ➡️ Static content loads from servers closest to the user. Example: Users in Delhi fetch images from a Delhi CDN node. ⸻ 5️⃣ Background Work with Queues ➡️ Heavy tasks run asynchronously so APIs respond instantly. Example: Payment succeeds now, email receipt sent in background. ⸻ 6️⃣ Split the Database (Sharding) ➡️ Divide data across multiple databases to handle scale. Example: Usernames A–M on one shard, N–Z on another. ⸻ 7️⃣ Rate Limiting ➡️ Prevent abuse and traffic spikes from taking the system down. Example: Limit clients to 100 requests/sec to block bots from killing the API. ⸻ 8️⃣ Lightweights Payloads ➡️ Smaller payloads = faster responses + less bandwidth. Example: Send only required fields instead of massive JSON blobs. Please follow for more such videos🙏 #systemdesign #softwaredevelopers #programming #tech #interview [API Design] [System Architecture] [API Scaling] [1 Million RPS] [Distributed Systems] [Load Balancing] [Database Sharding] [High Availability]
#Idempotency Request Reel by @yuvixcodes - Idempotency means:

No matter how many times the same request is sent, the result stays the same.

In payments, that means:
Send the charge request on
1.8K
YU
@yuvixcodes
Idempotency means: No matter how many times the same request is sent, the result stays the same. In payments, that means: Send the charge request once or ten times — the user is charged only once. It protects your system from: Network retries Double clicks Timeouts Duplicate requests If you’re building APIs, especially payment flows, idempotency isn’t optional. It’s a core backend principle. #backenddevelopment #systemdesign #softwareengineering #webdevelopment #fintech #payments #microservices #distributedSystems #nodejs #springboot #codinglife #programmer #techreels #learnbackend #idempotency
#Idempotency Request Reel by @enoughtoship - Idempotent API?
Check the pinned comment for info

software engineer tips | developer jargon explained | tech career growth | enough to ship | backend
81.4K
EN
@enoughtoship
Idempotent API? Check the pinned comment for info software engineer tips | developer jargon explained | tech career growth | enough to ship | backend development | system design for beginners | idempotent API explained | payment API design | idempotency key | prevent duplicate payments #softwareengineering #backenddeveloper #systemdesign #techcareer
#Idempotency Request Reel by @binarybopper (verified account) - Most production systems don't crash because of syntax errors.
They crash because of assumptions.

While writing code, developers silently assume thing
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BI
@binarybopper
Most production systems don’t crash because of syntax errors. They crash because of assumptions. While writing code, developers silently assume things: the input will always be valid, the API will always respond quickly, users will behave predictably, traffic won’t spike suddenly. In development environments, these assumptions often hold true. In production, they break. Real-world systems fail under edge cases, bad inputs, latency spikes, infrastructure delays, and unexpected user behavior. Strong software engineers challenge assumptions before writing code. They think about failure modes, data validation, network reliability, and scalability. Weak engineers focus only on making the code “work.” Production-ready thinking isn’t about cleaner syntax. It’s about anticipating how systems behave under uncertainty. Save this if you’re serious about building reliable systems. #softwareengineering #backenddevelopment #systemdesign #productionready #developermindset [production system failures, developer assumptions mistakes, backend reliability, system design thinking, production bugs explained, scalable system mindset]
#Idempotency Request Reel by @prajwal.decodes - Every system has a capacity ceiling.
Rate limiting is the control layer that prevents traffic from overwhelming finite resources.

Rate limiting restr
862
PR
@prajwal.decodes
Every system has a capacity ceiling. Rate limiting is the control layer that prevents traffic from overwhelming finite resources. Rate limiting restricts how many requests a client can make within a defined time window. Example: 100 requests per minute per user 10 requests per second per API key 1000 requests per second globally It enforces controlled consumption of system capacity. Why This Component Exists Modern systems operate under constrained resources: - CPU cores are finite - DB connections are limited - Thread pools have caps - Third-party APIs have quotas - AI inference is cost-bound Without rate limiting, traffic can exceed processing capacity before autoscaling reacts. Rate limiting protects: - Downstream dependencies - Shared infrastructure - Multi-tenant fairness -;Cloud cost boundaries It is a capacity management primitive. What Happens Without It - Connection pool exhaustion -;Database saturation - Retry storms during partial outages - Cascading latency failures - Single client monopolizing resources A viral spike or bot burst can take down an otherwise well-architected system. Autoscaling is reactive. Rate limiting is preventative. Tradeoffs 1. Strict limits: - Protect system stability - Hurt user experience during spikes 2. Loose limits: - Improve UX - Increase failure risk 3. Global limits: - Simple - Unfair to heavy but legitimate users 4. Per-user limits: - Fair - Higher coordination complexity in distributed setups Every limit is a balance between: Availability vs fairness vs performance. Where It’s Used in Real Systems - Public APIs (GitHub, Stripe, Twitter/X) - Authentication endpoints (login / OTP) - Payment gateways - AI inference APIs - SaaS multi-tenant platforms - Web scraping protection layers - Anywhere resource contention exists — rate limiting exists. Interview Framing Insight Basic answer: “Rate limiting prevents abuse.” Strong answer: “It protects downstream dependencies under constrained capacity.” Architect-level framing: Rate limiting is part of your system’s resilience strategy — alongside load shedding, circuit breaking, and backpressure. #reelgrowth #computerscience #softwareengineering #techreels #reelsinstagra
#Idempotency Request Reel by @codeliftwithdiv - Duplicate requests are normal in distributed systems.
Retries, network failures, or timeouts can cause the same request to hit your API multiple times
185
CO
@codeliftwithdiv
Duplicate requests are normal in distributed systems. Retries, network failures, or timeouts can cause the same request to hit your API multiple times. If your API isn’t designed properly → users get double payments, duplicate orders, or inconsistent data. Here’s how senior backend engineers prevent this 👇 ⸻ 1️⃣ Use Idempotency Keys (Best Practice) Client sends a unique idempotency key with each action. Example: • Payment request → idempotency_key = UUID Server logic: • First request → process normally and store response • Duplicate request with same key → return stored response ✅ Prevents duplicate side effects ✅ Safe retries ⸻ 2️⃣ Database Constraints (Last line of defense) Even if API fails: • Unique indexes • Composite keys • Transactional guarantees Example: • Unique constraint on order_id or (user_id, booking_slot) ⸻ 3️⃣ Distributed Locks (when resource contention exists) If only one action must succeed: • Redis locks • Optimistic locking • Version checks Use carefully — can add latency. ⸻ 4️⃣ Design APIs to be Idempotent Instead of: ❌ POST /createOrder Prefer: ✅ PUT /orders/{id} Same request = same result. ⸻ 🔑 Strong interview takeaway “Retries are inevitable. Systems must be designed to handle duplicate requests safely using idempotency.” Save this for system design interviews 🔖 #softwareengineer #systemdesign #softwaredevelopment #coding #meta
#Idempotency Request Reel by @softwarengineering - ⚡ Interviewer: Redis is single-threaded - how does it handle millions of requests so fast?

🧠 In-Memory Storage
Redis stores data in RAM → no disk I/
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SO
@softwarengineering
⚡ Interviewer: Redis is single-threaded — how does it handle millions of requests so fast? 🧠 In-Memory Storage Redis stores data in RAM → no disk I/O → nanosecond-level access. 🧵 Single Thread = No Locks No thread switching, no locking, no context-switch overhead → extremely predictable latency. 📡 I/O Multiplexing (epoll/kqueue) Handles thousands of connections using event-driven architecture → non-blocking networking. ⚡ Simple Operations Most Redis commands are O(1) → constant-time execution. 📦 Pipelining Support Clients send multiple commands in one round trip → fewer network hops. 🧩 Optimized Data Structures Highly optimized internal implementations (hash tables, skip lists). 🔄 Multi-Threaded I/O (Modern Redis) Networking can use multiple threads, but command execution stays single-threaded. 📉 Minimal Overhead No heavy ORM, no complex query planner → direct memory operations. In short: Redis is fast not despite being single-threaded — but partly because of it. 💾 Save this for backend interviews and 🔁 share it with a friend preparing for system design. #softwareengineering #systemdesign

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