shift is an application that makes it easy to run online schema migrations for MySQL databases
Note
Shift is no longer under active development. Its successor is SchemaBot, Block's GitOps tool for database schema changes: describe the desired schema in SQL files, open a pull request, and SchemaBot plans, applies, and verifies the change. Online MySQL schema changes run with Spirit.
shift was designed to solve the following problem - running schema migrations manually takes too much time. As such, it is most effective when schema migrations are taking up too much of your time (ex: for an operations or DBA team at a large organization), but really it can be used by anyone. As of writing this, shift has had no problem running hundreds of migrations a day or running migrations that take over a week to complete.
- safe, online schema changes (invokes the tried-and-true pt-online-schema-change)
- supports all "ALTER TABLE...", "CREATE TABLE...", or "DROP TABLE..." ddl
- a ui where you can see the status of migrations and run them with the click of a button
- self-service - out of the box, any user can file and run migrations, and an admin is only required to approve the ddl (this is all configurable though)
- shard support - easily run a single migration on any number of shards
shift consists of 3 components. Each component has its own readme with more details
- ui: a rails app where you can file, track, and run database migrations
- runner: a go agent that consumes jobs from an api exposed by the ui
- pt-osc patch: a patch for pt-online-schema-change from the percona toolkit
Watch a demo video here
Read the installation guide here
Copyright (c) 2016 Square Inc. Distributed under the Apache 2.0 License. See LICENSE file for further details.