Tagged articles

conditional update

3 articles · Page 1 of 1

Oct 2, 2026 · Backend Development

Concurrent Write Correctness: Choosing Between Conditional Updates, Pessimistic/Optimistic Locks, and Distributed Locks

This article analyzes four concurrency control patterns — conditional updates, pessimistic locking, optimistic locking with version numbers, and distributed locks — using inventory deduction, order editing, and third-party push examples. It explains when each pattern applies, how to combine them with idempotency, and provides concrete SQL and Redis implementations.

Concurrency ControlRedisconditional update

0 likes · 32 min read

Concurrent Write Correctness: Choosing Between Conditional Updates, Pessimistic/Optimistic Locks, and Distributed Locks

Yumin Fish Harvest

Sep 21, 2026 · Backend Development

Idempotency Design for Write Services: 7 Patterns & Selection Guide

This article details seven idempotency patterns for backend write operations—including unique keys with database constraints, state machines, execution records, naturally idempotent actions, request fingerprinting, client-generated keys, and server-issued tokens—with concrete examples, SQL code, and a selection guide to match each pattern to specific business scenarios like payment callbacks, order cancellations, and duplicate purchases.

backend developmentconditional updatedatabase unique constraint

0 likes · 29 min read

Idempotency Design for Write Services: 7 Patterns & Selection Guide

LuTiao Programming

Aug 19, 2026 · Backend Development

Recreating WeChat‑Style Message Recall with Spring Boot: Why Deleting Isn’t the Hard Part

The article walks through building a true WeChat‑like message recall feature in Spring Boot, explaining why simply deleting a row is insufficient and detailing the required status change, concurrency‑safe conditional update, multi‑device session handling, and cross‑instance event propagation.

Concurrency ControlSpring Bootconditional update

0 likes · 12 min read

Recreating WeChat‑Style Message Recall with Spring Boot: Why Deleting Isn’t the Hard Part