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Add developer documentation concerning gradual schema migrations with column alterations. #15691

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merged 5 commits into from
Sep 25, 2023
Merged

Add developer documentation concerning gradual schema migrations with column alterations. #15691

merged 5 commits into from
Sep 25, 2023

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reivilibre
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This is based on the reasoning and planning that went into the full_user_id migrations e.g. #15537.

Base: develop

Original commit schedule, with full messages:

  1. Add column migration with NOT NULL worked example

@reivilibre reivilibre force-pushed the rei/migration_worked_examples branch from 96f42a5 to c5d94bf Compare May 30, 2023 13:04
@reivilibre reivilibre marked this pull request as ready for review May 30, 2023 13:15
@reivilibre reivilibre requested a review from a team as a code owner May 30, 2023 13:15
squahtx
squahtx approved these changes May 30, 2023
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Looks good! Thank you for taking the time to write this up.

It's really tempting to try to remove version N+2 by moving the background update to N+1 and delaying adding the NOT NULL constraint to N+3, but that would mean the constraint would always be validated in the foreground in N+3. Whereas if the N+2 step is kept, the migration in N+3 would be fast in the happy case.

I wonder if we should make a note of this in case someone else spends 30 minutes trying to remove step N+2.

@MadLittleMods MadLittleMods added A-Database DB stuff like queries, migrations, new/remove columns, indexes, unexpected entries in the db A-Docs things relating to the documentation labels May 31, 2023
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reivilibre commented May 31, 2023 •
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I agree it would be good to add some note to that effect, not sure how to make the wording at the moment though.

@MadLittleMods MadLittleMods mentioned this pull request Jun 1, 2023
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clokep commented Aug 24, 2023

@reivilibre Looks like this has some simple feedback to handle and get this merged!

@clokep clokep enabled auto-merge (squash) September 25, 2023 17:39
@clokep clokep merged commit 9fd18e9 into develop Sep 25, 2023
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@clokep clokep deleted the rei/migration_worked_examples branch September 25, 2023 17:43
Fizzadar added a commit to beeper/synapse-legacy-fork that referenced this pull request Oct 30, 2023
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Merge tag 'v1.94.0' into merge-1.94
97fe6f8 
No significant changes since 1.94.0rc1.

- Render plain, CSS, CSV, JSON and common image formats in the browser (inline) when requested through the /download endpoint. ([\matrix-org#15988](matrix-org#15988))
- Add experimental support for [MSC4028](matrix-org/matrix-spec-proposals#4028) to push all encrypted events to clients. ([\matrix-org#16361](matrix-org#16361))
- Minor performance improvement when sending presence to federated servers. ([\matrix-org#16385](matrix-org#16385))
- Minor performance improvement by caching server ACL checking. ([\matrix-org#16360](matrix-org#16360))

- Add developer documentation concerning gradual schema migrations with column alterations. ([\matrix-org#15691](matrix-org#15691))
- Improve documentation of the user directory search algorithm. ([\matrix-org#16320](matrix-org#16320))
- Fix rendering of user admin API documentation around deactivation. This was broken in Synapse 1.91.0. ([\matrix-org#16355](matrix-org#16355))
- Update documentation around message retention policies. ([\matrix-org#16382](matrix-org#16382))
- Add note to `federation_domain_whitelist` config option to clarify its usage. ([\matrix-org#16416](matrix-org#16416))
- Improve legacy release notes. ([\matrix-org#16418](matrix-org#16418))

- Remove Python version from `/_synapse/admin/v1/server_version`. ([\matrix-org#16380](matrix-org#16380))

- Avoid running CI steps when the files they check have not been changed. ([\matrix-org#14745](matrix-org#14745), [\matrix-org#16387](matrix-org#16387))
- Improve type hints. ([\matrix-org#14911](matrix-org#14911), [\matrix-org#16350](matrix-org#16350), [\matrix-org#16356](matrix-org#16356), [\matrix-org#16395](matrix-org#16395))
- Added support for pydantic v2 in addition to pydantic v1. Contributed by Maxwell G (@gotmax23). ([\matrix-org#16332](matrix-org#16332))
- Get CI to check PRs have been signed-off. ([\matrix-org#16348](matrix-org#16348))
- Add missing licence header. ([\matrix-org#16359](matrix-org#16359))
- Improve type hints, and bump types-psycopg2 from 2.9.21.11 to 2.9.21.14. ([\matrix-org#16381](matrix-org#16381))
- Improve comments in `StateGroupBackgroundUpdateStore`. ([\matrix-org#16383](matrix-org#16383))
- Update maturin configuration. ([\matrix-org#16394](matrix-org#16394))
- Downgrade replication stream time out error log lines to warning. ([\matrix-org#16401](matrix-org#16401))

* Bump actions/checkout from 3 to 4. ([\matrix-org#16250](matrix-org#16250))
* Bump cryptography from 41.0.3 to 41.0.4. ([\matrix-org#16362](matrix-org#16362))
* Bump dawidd6/action-download-artifact from 2.27.0 to 2.28.0. ([\matrix-org#16374](matrix-org#16374))
* Bump docker/setup-buildx-action from 2 to 3. ([\matrix-org#16375](matrix-org#16375))
* Bump gitpython from 3.1.35 to 3.1.37. ([\matrix-org#16376](matrix-org#16376))
* Bump msgpack from 1.0.5 to 1.0.6. ([\matrix-org#16377](matrix-org#16377))
* Bump msgpack from 1.0.6 to 1.0.7. ([\matrix-org#16412](matrix-org#16412))
* Bump phonenumbers from 8.13.19 to 8.13.22. ([\matrix-org#16413](matrix-org#16413))
* Bump psycopg2 from 2.9.7 to 2.9.8. ([\matrix-org#16409](matrix-org#16409))
* Bump pydantic from 2.3.0 to 2.4.2. ([\matrix-org#16410](matrix-org#16410))
* Bump regex from 1.9.5 to 1.9.6. ([\matrix-org#16408](matrix-org#16408))
* Bump sentry-sdk from 1.30.0 to 1.31.0. ([\matrix-org#16378](matrix-org#16378))
* Bump types-netaddr from 0.8.0.9 to 0.9.0.1. ([\matrix-org#16411](matrix-org#16411))
* Bump types-psycopg2 from 2.9.21.11 to 2.9.21.14. ([\matrix-org#16381](matrix-org#16381))
* Bump urllib3 from 1.26.15 to 1.26.17. ([\matrix-org#16422](matrix-org#16422))

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# Conflicts:
#	.github/workflows/docker.yml
#	.github/workflows/docs-pr-netlify.yaml
#	.github/workflows/docs-pr.yaml
#	.github/workflows/docs.yaml
#	.github/workflows/latest_deps.yml
#	.github/workflows/poetry_lockfile.yaml
#	.github/workflows/push_complement_image.yml
#	.github/workflows/release-artifacts.yml
#	.github/workflows/tests.yml
#	.github/workflows/twisted_trunk.yml
#	poetry.lock
#	rust/src/push/base_rules.rs
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