Large Hadron Migrator
ghost_adapter
| Large Hadron Migrator | ghost_adapter | |
|---|---|---|
| 3 | 2 | |
| 1,816 | 18 | |
| 0.2% | - | |
| 0.0 | 1.5 | |
| 8 months ago | 7 days ago | |
| Ruby | Ruby | |
| BSD 3-clause "New" or "Revised" License | GNU General Public License v3.0 or later |
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Large Hadron Migrator
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GitHub downtime root cause analysis
No you didn't. They're doing what is often referred as "online schema change" using https://github.com/github/gh-ost (but the concept is the same than percona's pt-online-schema-change, or https://github.com/soundcloud/lhm.
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Database... or Goose?
Is there anything similar for MySQL? There is https://github.com/soundcloud/lhm but it's pretty much outdated nowadays
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Do you use migrations for data manipulations? What are the pro's and con's ?
I may do it from the console or a task if I wanted to modify a large number of records, e.g. something in my Users table. I think you need a sense of how long the update will take - I'm not sure if there's any issue with migrations timing out or such like. If I modify my Users schema it takes 5 minutes or so as it has to make a copy of the table and swap it in and that works fine - https://github.com/soundcloud/lhm
ghost_adapter
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Changing Tires at 100mph: A Guide to Zero Downtime Migrations
At least for Rails there are several gems available (ie https://github.com/WeTransfer/ghost_adapter or https://github.com/departurerb/departure) that seamlessly hook into the existing migration system and will run all eligible migrations through gh-ost or pt-osc as needed. You're right that it's not free but it isn't all that far off either.
That said, online schema migrations are a specialized tool designed for very big tables that take hours to run an ALTER TABLE on. If all your tables are small enough that alterations take less than a second or so, don't bother and just block the table for a bit. It's fine.
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Database... or Goose?
https://github.com/WeTransfer/ghost_adapter integrates gh-ost with activerecord and the departure gem does the same but for pt-osc.
What are some alternatives?
Squasher - Squasher - squash your old migrations in a single command
strong_migrations - Catch unsafe migrations in development
Lol DBA - lol_dba is a small package of rake tasks that scan your application models and displays a list of columns that probably should be indexed. Also, it can generate .sql migration scripts.
safe-pg-migrations - Make your PostgreSQL migrations safe
Foreigner - Adds foreign key helpers to migrations and correctly dumps foreign keys to schema.rb
wt_activerecord_index_spy - A gem to spy queries running with Active Record and report missing indexes
BatchLoader - :zap: Powerful tool for avoiding N+1 DB or HTTP queries
Ruby on Rails - Ruby on Rails
PgHero - A performance dashboard for Postgres
database-lab-engine - DBLab enables 🖖 database branching and ⚡️ thin cloning for any Postgres database and empowers DB testing in CI/CD. This optimizes database-related costs while improving time-to-market and software quality. Follow to stay updated.
Seedbank - Seedbank gives your seed data a little structure. Create seeds for each environment, share seeds between environments and specify dependencies to load your seeds in order. All nicely integrated with simple rake tasks.
reshape - An easy-to-use, zero-downtime schema migration tool for Postgres