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This commit introduces the usage of Common Table Expressions (CTEs) to
efficiently retrieve nested group hierarchies, without having to rely on
the "routes" table (which is an _incredibly_ inefficient way of getting
the data). This requires a patch to ActiveRecord (found in the added
initializer) to work properly as ActiveRecord doesn't support WITH
statements properly out of the box.
Unfortunately MySQL provides no efficient way of getting nested groups.
For example, the old routes setup could easily take 5-10 seconds
depending on the amount of "routes" in a database. Providing vastly
different logic for both MySQL and PostgreSQL will negatively impact the
development process. Because of this the various nested groups related
methods return empty relations when used in combination with MySQL.
For project authorizations the logic is split up into two classes:
* Gitlab::ProjectAuthorizations::WithNestedGroups
* Gitlab::ProjectAuthorizations::WithoutNestedGroups
Both classes get the fresh project authorizations (= as they should be
in the "project_authorizations" table), including nested groups if
PostgreSQL is used. The logic of these two classes is quite different
apart from their public interface. This complicates development a bit,
but unfortunately there is no way around this.
This commit also introduces Gitlab::GroupHierarchy. This class can be
used to get the ancestors and descendants of a base relation, or both by
using a UNION. This in turn is used by methods such as:
* Namespace#ancestors
* Namespace#descendants
* User#all_expanded_groups
Again this class relies on CTEs and thus only works on PostgreSQL. The
Namespace methods will return an empty relation when MySQL is used,
while User#all_expanded_groups will return only the groups a user is a
direct member of.
Performance wise the impact is quite large. For example, on GitLab.com
Namespace#descendants used to take around 580 ms to retrieve data for a
particular user. Using CTEs we are able to reduce this down to roughly 1
millisecond, returning the exact same data.
== On The Fly Refreshing
Refreshing of authorizations on the fly (= when
users.authorized_projects_populated was not set) is removed with this
commit. This simplifies the code, and ensures any queries used for
authorizations are not mutated because they are executed in a Rails
scope (e.g. Project.visible_to_user).
This commit includes a migration to schedule refreshing authorizations
for all users, ensuring all of them have their authorizations in place.
Said migration schedules users in batches of 5000, with 5 minutes
between every batch to smear the load around a bit.
== Spec Changes
This commit also introduces some changes to various specs. For example,
some specs for ProjectTeam assumed that creating a personal project
would _not_ lead to the owner having access, which is incorrect. Because
we also no longer refresh authorizations on the fly for new users some
code had to be added to the "empty_project" factory. This chunk of code
ensures that the owner's permissions are refreshed after creating the
project, something that is normally done in Projects::CreateService.
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Allow numeric values in gitlab-ci.yml
Closes #30017
See merge request !10607
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Fix adding defaults for concurrent column renames
See merge request !11335
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By adding the default value _after_ adding the column we avoid updating
all rows in a table, saving a lot of time and unnecessary work in the
process.
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Added balsamiq jasmine integration test
Closes #31889
See merge request !11257
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add username field to push webhook
Closes #32136
See merge request !11272
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Signed-off-by: David Turner <novalis@novalis.org>
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Fix typo in code snippet to match text below
See merge request !11101
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Fix the GitLab EE link
See merge request !11021
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fix $CI_JOB_ID variable
See merge request !10966
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introduced with rename variables commit: a084437b5c1b7226ce64e74bab1972bb1dbd49e0
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Fetch commit deltas from Gitaly
Closes gitaly#199
See merge request !11122
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Closes gitaly#199
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Ensure schedule_form and schedules_index both utilize common_vue bundle
See merge request !11274
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Backport New SystemHook: `repository_update`
Closes #26325
See merge request !11140
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[ci skip]
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[ci skip]
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Wait for requests after each Spinach scenario instead of feature
See merge request !11349
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[ci skip]
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[ci skip]
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Link to a case where we can't support MySQL
Closes #32181
See merge request !11334
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This updates the requirements guide to include a link to an issue where
we discuss dropping MySQL support for nested groups. This should give
users a better understanding of why we highly recommend them to use
PostgreSQL instead.
[ci skip]
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Remove trailing comma in dependency linker to satisfy Rubocop
See merge request !11348
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Add fixed positioning to top level navbar
Closes #30975
See merge request !10751
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Relax rake backup regex to handle CE and EE RCs
See merge request !11345
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See http://rubular.com/r/uTDlT85zW1
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Fix conflict resolution from corrupted upstream
Closes gitlab-ee#2128
See merge request !11298
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I don't know why this happens exactly, but given an upstream and fork repository
from a customer, both of which required GC, resolving conflicts would corrupt
the fork so badly that it couldn't be cloned.
This isn't a perfect fix for that case, because the MR may still need to be
merged manually, but it does ensure that the repository is at least usable.
My best guess is that when we generate the index for the conflict
resolution (which we previously did in the target project), we obtain a
reference to an OID that doesn't exist in the source, even though we already
fetch the refs from the target into the source.
Explicitly setting the source project as the place to get the merge index from
seems to prevent repository corruption in this way.
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