# Qihoo360/Atlas

A high-performance and stable proxy for MySQL, it is developed by Qihoo's DBA and infrastructure team

Repository: https://github.com/Qihoo360/Atlas
Canonical: https://ross.abutalabs.com/products/qihoo360-atlas
Language: C
License: GPL-2.0
License Family: copyleft
Last push: 2019-01-04T09:14:10+00:00

## Health v2 (maintenance only)
Score: 23/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 0, release rhythm 8, longevity 100
- inputs: {"age_days": 4641, "days_push": 2798, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 4619, forks 1135 (observed 2026-08-28T04:08:55.145025+00:00)

## What it is
Atlas is a high-performance MySQL protocol proxy (database middleware) developed by Qihoo 360's DBA and infrastructure team, based on MySQL-Proxy 0.8.2 and rewritten largely in C. It provides read/write splitting, load balancing, failover, IP filtering, and data sharding for MySQL backends.

## Use cases
- split MySQL reads and writes across master and slave servers
- load balance queries across multiple MySQL backends with failover
- shard MySQL tables across backend databases
- filter client connections by IP address
- take backend MySQL servers online or offline without downtime
- reload proxy configuration without restarting

## When to choose
- you run a legacy MySQL deployment on Linux and need a proven C-based proxy for read/write splitting and sharding
- you want battle-tested middleware with billions of forwarded requests in production at Qihoo 360

## When to avoid
- you need active maintenance, recent releases, or community support - the latest release is from January 2019
- you need support for databases other than MySQL or modern cloud-native features
- you prefer actively maintained alternatives like ProxySQL, Vitess, or MySQL Router

## Facets
- artifact type: service
- maturity: abandoned
- function: proxy, database, middleware, routing
- domain: databases, backend, microservices
- platform: c
- tags: mysql-proxy, read-write-splitting, sharding, database-middleware, connection-pool, load-balancing, linux

## Member repositories
- Qihoo360/Atlas (main) score 23

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:08:55.145025+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 2026-08-29T18:19:39.727725+00:00, confidence not recorded.
  - readme: https://github.com/Qihoo360/Atlas (fetched 2026-08-28T04:08:55.145025+00:00, sha 3a3244daa2da)
- Data as of 2026-08-30T08:39:29.467469+00:00.