gh-ost | ||
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32 | 421 | |
12,010 | 15,552 | |
0.6% | - | |
7.5 | 0.0 | |
1 day ago | over 6 years ago | |
Go | Python | |
MIT License | - |
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gh-ost
- "At GitHub we do not use foreign keys, ever, anywhere"
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How Modern SQL Databases Are Changing Web Development - #3 Better Developer Experience
I’ve been through multiple incidents where everything worked fine in the testing environment but ended up locking the production database for minutes when deployed. A category of open-source tools called OSC (Online Schema Change) exists to mitigate such pain, like gh-ost used by GitHub and OSC used by Meta. They work by creating a set of "ghost tables" to apply the migrations, copy over old data from the original tables, and catch up with new writes simultaneously. When all old data is migrated, you can trigger a cutover to make the "ghost tables" production. Check the post below for a great introduction and comparison:
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We migrated to SQL. Our biggest learning? Don't use Prisma
Sounds like it's basically explained in the gh-ost readme https://github.com/github/gh-ost#how
I think it amounts to "use views to decouple access to the table with a fixed interface" and "use triggers for migrating data between tables"
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Ask HN: Is PostgreSQL better than MySQL?
Gh-ost is the new hotness. Simple to use and lots of great features: https://github.com/github/gh-ost
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My Green/blue AWS db deployment strategy for avoiding data loss due to table locks
If the performance of the db is a concern during migrations (locking, high cpu consumption for large writes) there are tools that can help and do similiar to what your describing but with the benefit that they are battle tested tools. This one spring to mind https://github.com/github/gh-ost there are other options as well and its worth reading the trade off docs
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Changing column from longtext to mediumtext taking over 2 hours
Not sure which version of MySQL you're using, but one approach would be to use a tool like pt-online-schema-change (from Percona) or g-host -- which will create a duplicate table and then swap it in place of the original table. It's a safer approach when operating in production environments. Here's a good comparison of the tools many people use https://planetscale.com/docs/learn/online-schema-change-tools-comparison
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Ask HN: Do you use foreign Keys in Relational Databases
No, especially on large tables with billions of records. They make online schema changes impossible. More details: https://github.com/github/gh-ost/issues/331#issuecomment-266...
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Migrating a production database without any downtime
Tip #4: Consider slow-running migrations. Some tables can be so large that the traditional migration way is simply not a viable option for them. In such cases, you can consider embedding the data migration code right into your application, or use a special utility like GitHub's online schema migration for MySQL. A slow-running migration can work in production for days or even weeks. It gradually converts the data by small chunks, so you can carefully balance the load on the database while making sure that it doesn't cause slowness or downtime.
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How do you handle RDS schema migrations?
GitHub gh-ost
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Changing Tires at 100mph: A Guide to Zero Downtime Migrations
Actually I never tried but I was scared by the small print of GH not using RDS themselves [1] and Ghost relying on lower-level features that might be not easily available in RDS. Also I had the impression you have to setup a normal non-RDS replica attached to your RDS master?
[1] https://github.com/github/gh-ost/blob/master/doc/rds.md
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Ask HN: Why isn't HN libre/FOSS?
Slashdot, reddit, and HN are similar in that the source code was available. For HN, as part of arc under the Artistic license. All 3 abandoned public source code releases.
https://sourceforge.net/projects/slashcode/
https://github.com/arclanguage/anarki
https://github.com/reddit-archive/reddit
- The boiling frog of digital freedom
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Karma, votes, and diminishing returns
While it would likely have zero overlap with the code in use today if you look at the old code Reddit used to publish for voting the model at that point used to have flags/checks for :
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[reddit self-host] Thrift issues?
I've been trying to host my own instance of Reddit from archived source code on GitHub. Even though I am aware that's probably not a good idea since many dependencies are broken and there's practically no documentation on anything (and it's really old legacy code), but I still decided to give it a shot.
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Does anyone else just feel sad about all of this?
Shh, don't tell spez, the code is already available on the github https://github.com/reddit-archive/reddit/
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Delv guy here: Sharing the mockup
Automod to act based on keywords/domains/etc., ideally using the same language/flags/regex/etc. of the original automod (old code) so that it's possible to use existing code. (For detecting off-topic posts, enforcing a title format, reminding the users to add missing details to post, filtering profanity, shadowbanning spammers, etc.)
- Users in r/harrypotter lashing out as mods ignore community vote
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Rings.social – Reddit-API compatible and Open Source content-voting platform
Reddit pre enshittification is actually open source so spinning up your own Reddit instance should be trivially easy. I’m very surprised no one did this after the API protests started
https://github.com/reddit-archive/reddit
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Keep the clients, make a new backend?
There are already 1:1 reddit clones based on older versions of their software that was open source: https://github.com/reddit-archive/reddit
- Was ist aus diesem Sub eigentlich geworden?
What are some alternatives?
pg-online-schema-change - Easy CLI tool for making zero downtime schema changes and backfills in PostgreSQL [Moved to: https://github.com/shayonj/pg-osc]
Vanilla Forums - Vanilla is a powerfully simple discussion forum you can easily customize to make as unique as your community.
doctrine-test-bundle - Symfony bundle to isolate your app's doctrine database tests and improve the test performance
Mastodon - Your self-hosted, globally interconnected microblogging community
squawk - 🐘 linter for PostgreSQL, focused on migrations
bypass-paywalls-chrome - Bypass Paywalls web browser extension for Chrome and Firefox.
pg_squeeze - A PostgreSQL extension for automatic bloat cleanup
lenny - ( ͡° ͜ʖ ͡°) A more user-respectful fork of Lemmy. Created for https://derpy.email.
hub - A command-line tool that makes git easier to use with GitHub.
Lemmy - 🐀 A link aggregator and forum for the fediverse
Jenkins - Jenkins automation server
Discourse - A platform for community discussion. Free, open, simple.