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WeChat Backend Team

Official account of the WeChat backend development team, sharing their experience in large-scale distributed system development.

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Latest from WeChat Backend Team

47 recent articles

WeChat Backend Team

Sep 6, 2016 · Databases

PhxSQL: Delivering Zookeeper‑Level Strong Consistency & High Availability for MySQL

PhxSQL is an open‑source MySQL cluster that uses Paxos to provide Zookeeper‑level linearizable consistency and high availability while remaining fully compatible with MySQL, offering read‑write and read‑only ports, minimal MySQL intrusion, simple architecture, and detailed design principles compared to alternatives like Galera and MySQL Group Replication.

MySQLPaxos

0 likes · 18 min read

PhxSQL: Delivering Zookeeper‑Level Strong Consistency & High Availability for MySQL

WeChat Backend Team

Aug 30, 2016 · Databases

How PhxSQL Achieves MySQL‑Compatible High Availability with Paxos‑Based Replication

PhxSQL is an open‑source, MySQL‑compatible relational database cluster that uses a Paxos‑based log store and a three‑layer architecture (Phxbinlogsvr, Phxsqlproxy, Phxsync) to provide automatic master failover, strong data consistency, and improved write performance compared to MySQL semi‑synchronous replication.

MySQLPaxosReplication

0 likes · 10 min read

How PhxSQL Achieves MySQL‑Compatible High Availability with Paxos‑Based Replication

WeChat Backend Team

Aug 25, 2016 · Backend Development

Exploring PhxRPC: A Lightweight High-Performance RPC Framework for Backend Development

PhxRPC is a compact, 450KB RPC framework from the WeChat backend team that uses Protobuf for IDL, offers semi‑sync/async processing with Epoll‑based IO threads, provides built‑in overload protection, and includes performance benchmarks, usage instructions, and code generation details.

BoostC++Performance

0 likes · 6 min read

Exploring PhxRPC: A Lightweight High-Performance RPC Framework for Backend Development

WeChat Backend Team

Aug 24, 2016 · Databases

Understanding MySQL Semi‑Synchronous Replication and Master Switch Challenges

This article examines MySQL's semi‑synchronous replication, analyzes consistency scenarios across master‑slave failures and switches, and highlights the difficulties of data rollback and multi‑master conflicts that affect high‑availability clusters.

Data ConsistencyMySQLSemi‑synchronous Replication

0 likes · 12 min read

Understanding MySQL Semi‑Synchronous Replication and Master Switch Challenges

WeChat Backend Team

Jun 28, 2016 · Fundamentals

Mastering Simple Paxos: The Core Theory Behind Distributed Consensus

This article demystifies the foundational Simple Paxos algorithm by walking through its theoretical proof, key constraints, and multi‑round voting process, using annotated slides and examples to help readers grasp the essential concepts behind distributed consensus.

Algorithm TheoryPaxosPhxPaxos

0 likes · 10 min read

Mastering Simple Paxos: The Core Theory Behind Distributed Consensus

WeChat Backend Team

Jun 22, 2016 · Fundamentals

How PhxPaxos Turns Paxos Theory into a Production‑Grade Consensus Library

This article provides a beginner-friendly, engineering-focused overview of the production‑grade Paxos library PhxPaxos, explaining the consensus protocol, its roles, instance management, state‑machine integration, performance optimizations, multi‑group deployment, and practical considerations such as disk durability, leader election, and log checkpointing.

Paxosdistributed consensusfault tolerance

0 likes · 30 min read

How PhxPaxos Turns Paxos Theory into a Production‑Grade Consensus Library

WeChat Backend Team

Jun 14, 2016 · Backend Development

How WeChat Generates Trillions of Sequence Numbers with Sub‑Millisecond Latency

This article explains how WeChat’s seqsvr service generates trillions of per‑user sequence numbers with sub‑millisecond latency, detailing its core architecture, pre‑allocation and section‑sharing strategies, engineering implementation with StoreSvr and AllocSvr, and the evolution of its disaster‑recovery designs from primary‑backup to embedded routing tables.

ScalabilitySequenceWeChat

0 likes · 20 min read

How WeChat Generates Trillions of Sequence Numbers with Sub‑Millisecond Latency