Large Hadron Migrator
maintenance_tasks
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| Large Hadron Migrator | maintenance_tasks | |
|---|---|---|
| 3 | 2 | |
| 1,816 | 906 | |
| 0.5% | 2.1% | |
| 0.0 | 9.0 | |
| 8 months ago | 1 day ago | |
| Ruby | Ruby | |
| BSD 3-clause "New" or "Revised" License | MIT License |
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.
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 There is https://github.com/soundcloud/lhm but it's pretty much outdated nowadays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
maintenance_tasks
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Dealing with race conditions in ruby scripts run concurrently
Check out https://github.com/Shopify/maintenance_tasks
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Do you use migrations for data manipulations? What are the pro's and con's ?
We use this technique. https://github.com/Shopify/maintenance_tasks. It is similar to a job (it uses a job under the hood) that can be be paused, interrupted by a deploy, and even aborted.
What are some alternatives?
Squasher - Squasher - squash your old migrations in a single command
migration_data - Migrate data along with schema migrations in Rails and keep them up to date.
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.
mergration - Generate migration files from your mermaid ER diagrams
Foreigner - Adds foreign key helpers to migrations and correctly dumps foreign keys to schema.rb
Discourse - A platform for community discussion. Free, open, simple.
BatchLoader - :zap: Powerful tool for avoiding N+1 DB or HTTP queries
maintenance_job - Mechanism to run testable one-off jobs in Rails at deploy time to manipulate data
PgHero - A performance dashboard for Postgres
Ruby on Rails - Ruby on Rails
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.
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