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Code Farming

Senior engineer at a top internet giant, sharing Java, AI, tech knowledge, growth insights, and interview experiences.

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Latest from Code Farming

41 recent articles

Code Farming

Jul 30, 2026 · Backend Development

Can Your System Survive a Sudden 500K Live Viewers? 4 Proven Traffic‑Splitting Techniques

When a live broadcast suddenly attracts 500,000 viewers, the system faces 100,000 QPS likes and rapid reward transactions; this article breaks down a battle‑tested traffic‑splitting architecture—room‑based sharding, queue buffering, multi‑layer write caching, and consistent‑hash sharding—showing how each component controls load, ensures consistency, and enables seamless scaling.

Consistent HashingHigh ConcurrencyLive Streaming

0 likes · 6 min read

Can Your System Survive a Sudden 500K Live Viewers? 4 Proven Traffic‑Splitting Techniques

Code Farming

Jul 29, 2026 · Backend Development

Billions of Logs in Seconds: How Elasticsearch Makes It Possible

The article explains how Elasticsearch achieves sub‑second search over billions of log entries by combining sharding, immutable segment writes, a three‑layer inverted index, and a two‑phase query‑then‑fetch process that distributes work across nodes.

Distributed SearchElasticsearchSharding

0 likes · 6 min read

Billions of Logs in Seconds: How Elasticsearch Makes It Possible

Code Farming

Jul 26, 2026 · Backend Development

How Is a Red Envelope System Designed for High‑Concurrency?

This article breaks down the end‑to‑end design of a high‑traffic red‑envelope service, covering its three‑stage lifecycle, a fair double‑mean allocation algorithm, the need to separate grabbing from settlement, and how Redis, Lua scripts, and message queues handle massive concurrent requests.

BackendDistributed LockMessage Queue

0 likes · 7 min read

How Is a Red Envelope System Designed for High‑Concurrency?

Code Farming

Jul 23, 2026 · Backend Development

Cut Authentication Traffic 50‑Fold with JWT: A Simple Token Strategy

The article explains how replacing centralized session lookups with JWT-based local verification can cut authentication latency from 15 ms to 0.3 ms—a roughly 50‑fold improvement—while describing a double‑token strategy, its refresh flow, security best practices, and trade‑offs such as delayed revocation.

JWTaccess tokenperformance

0 likes · 6 min read

Cut Authentication Traffic 50‑Fold with JWT: A Simple Token Strategy

Code Farming

Jul 22, 2026 · Backend Development

Designing a 5‑Layer Flash‑Sale System to Handle Millions of Requests

To survive a million concurrent flash‑sale clicks, the article breaks down a production‑grade, five‑layer architecture—CDN, load balancer, API gateway, Redis/Lua stock control, message‑queue order processing, and a state‑machine fallback—that filters traffic early, uses atomic operations, and decouples writes to keep database load to just a few QPS.

LuaMessage QueueMySQL

0 likes · 7 min read

Designing a 5‑Layer Flash‑Sale System to Handle Millions of Requests

Code Farming

Jul 20, 2026 · Backend Development

How a Message Queue Keeps Flash‑Sale Systems Stable Under 10k Orders per Second

The article explains how using a message queue as a buffer, asynchronous processor, and decoupling layer enables flash‑sale systems to handle tens of thousands of orders per second, reducing database overload, cutting response time from 500 ms to 50 ms, and preventing cascade failures.

Asynchronous ProcessingDecouplingHigh Concurrency

0 likes · 5 min read

How a Message Queue Keeps Flash‑Sale Systems Stable Under 10k Orders per Second

Code Farming

Jul 13, 2026 · Backend Development

Mastering Traffic Control: Keeping Systems Stable Under a Million Concurrent Requests

The article explains how to prevent system crashes during massive traffic spikes by applying three core techniques—rate limiting, circuit breaking, and graceful degradation—detailing algorithm choices, state machines, and practical implementation steps for high‑concurrency back‑end services.

BackendCircuit BreakerHigh Concurrency

0 likes · 6 min read

Mastering Traffic Control: Keeping Systems Stable Under a Million Concurrent Requests

Code Farming

Jul 13, 2026 · Backend Development

Designing Trillion‑Scale Counters: From MySQL to a Custom Redis Engine

The article dissects a proven trillion‑level counter architecture, tracing its evolution from a simple MySQL table through hash sharding, a full Redis migration, deep Redis memory optimizations, and hot‑cold separation, while detailing the trade‑offs and performance gains at each step.

High ConcurrencyMessage QueueRedis optimization

0 likes · 6 min read

Designing Trillion‑Scale Counters: From MySQL to a Custom Redis Engine

Code Farming

Jul 9, 2026 · Cloud Native

How Service Registries Enable Dynamic Addressing in Distributed Systems

The article explains why static service addresses break in micro‑service architectures, then breaks down the core mechanisms of a registration center—service registration and discovery, heartbeat health checks, and a selection matrix of Nacos, Eureka, ZooKeeper, and ETCD—providing practical guidance for choosing the right solution.

EurekaMicroservicesNacos

0 likes · 6 min read

How Service Registries Enable Dynamic Addressing in Distributed Systems

Code Farming

Jul 7, 2026 · Backend Development

Four Ways to Ensure Unique IDs After Database Sharding

When a system is split into multiple databases and tables, the article explains the root cause of ID collisions and compares four mainstream ID generation strategies—UUID, database auto‑increment, Snowflake, and segment allocation—detailing their trade‑offs, pitfalls, and selection guidelines for different concurrency levels.

High ConcurrencyShardingSnowflake

0 likes · 9 min read

Four Ways to Ensure Unique IDs After Database Sharding