# twitter-forks/mysql

MySQL fork maintained and used at Twitter

Repository: https://github.com/twitter-forks/mysql
Canonical: https://ross.abutalabs.com/products/twitter-forks-mysql
Homepage: https://github.com/twitter/mysql/wiki
Language: C++
License: GPL-2.0
License Family: copyleft
Last push: 2017-02-22T15:27:40+00:00

## Health v2 (maintenance only)
Score: 32/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 0, release rhythm 35, longevity 100
- inputs: {"age_days": 5356, "days_push": 3479, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1733, forks 448 (observed 2026-08-28T04:05:28.934725+00:00)

## What it is
Twitter's fork of MySQL 5.5 with internal enhancements such as extra InnoDB status variables, NUMA-aware memory allocation, and replication improvements. It was published to share code but is explicitly not intended for use outside Twitter.

## Use cases
- run a MySQL server with better InnoDB observability
- optimize MySQL buffer pool allocation on NUMA hardware
- monitor InnoDB deadlocks and open tablespace files
- use dynamic replication filters in MySQL
- study Twitter's production MySQL modifications

## When to choose
- you are researching Twitter's database engineering practices
- you need the specific NUMA or status-variable patches on MySQL 5.5
- you want a historical reference for WebScaleSQL-era MySQL forks

## When to avoid
- you need a supported, up-to-date database server
- you are not Twitter and want bug fixes or maintenance guarantees
- you need modern MySQL features from 5.7 or 8.0

## Facets
- artifact type: application
- maturity: abandoned
- function: database, monitoring
- domain: databases, developer-tools
- platform: cpp
- tags: mysql-fork, innodb, numa, twitter, database-server, linux

## Member repositories
- twitter-forks/mysql (main) score 32

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:05:28.934725+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T03:31:28.781323+00:00, confidence not recorded.
  - readme: https://github.com/twitter-forks/mysql (fetched 2026-08-28T04:05:28.934725+00:00, sha 7f74333b65a9)
  - homepage: https://github.com/twitter/mysql/wiki (fetched 2026-08-29T11:08:13.111875+00:00, sha ae04b6a2ca30)
- Data as of 2026-08-30T08:39:29.467469+00:00.