Index creation does not have an effect if the index is present already.
Index removal does not have an affect if the index is not present.
This helps to avoid patterns like this in migrations:
```
if index_exists?(...)
remove_concurrent_index(...)
end
```
The concurrency issue originates from inserts on
`user_interacted_projects` from the app while running the post-deploy
migration.
This change comes with a strategy to lock the table while removing
duplicates and creating the unique index (and similar for FK
constraints).
Also, we'll have a non-unique index until the post-deploy migration is
finished to speed up queries during that time.
Closes#44205.
Prior to this commit we would essentially update all rows in a table,
even those where the source column (e.g. `issues.closed_at`) was NULL.
This in turn could lead to statement timeouts when using the default
batch size of 10 000 rows per job.
To work around this we don't schedule jobs for rows where the source
value is NULL. We also don't update rows where the source column is NULL
(as an extra precaution) or the target column already has a non-NULL
value. Using this approach it should be possible to update 10 000 rows
in the "issues" table in about 7.5 - 8 seconds.
Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/42158
This adds a minimum interval to BackgroundMigrationWorker, ensuring
background migrations of the same class only run once every 5 minutes.
This prevents a thundering herd problem where scheduled migrations all
run at once due to their delays having been expired (e.g. as the result
of a queue being paused for a long time).
If a job was recently executed it's rescheduled with a delay that equals
the remaining time of the job's lease. This means that if the lease
expires in two minutes we only need to wait two minutes, instead of
five.
Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/41624
In a previous attempt (rolled back in
https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/16021) we tried
to migrate `issues.closed_at` from timestamp to timestamptz using a
regular migration. This has a bad impact on GitLab.com and as such was
rolled back.
This commit re-implements the original migrations using generic
background migrations, allowing us to still migrate the data in a single
release but without a negative impact on availability.
To ensure the database schema is up to date the background migrations
are performed inline in development and test environments. We also make
sure to not migrate that that doesn't need migrating in the first place
or has already been migrated.
* upstream/master: (671 commits)
Make rubocop happy
Use guard clause
Improve language
Prettify
Use temp branch
Pass info about who started the job and which job triggered it
Docs: add indexes for monitoring and performance monitoring
clearer-documentation-on-inline-diffs
Add docs for commit diff discussion in merge requests
sorting for tags api
Clear BatchLoader after each spec to prevent holding onto records longer than necessary
Include project in BatchLoader key to prevent returning blobs for the wrong project
moved lfs_blob_ids method into ExtractsPath module
Converted JS modules into exported modules
spec fixes
Bump gitlab-shell version to 5.10.3
Clear caches before updating MR diffs
Use new Ruby version 2.4 in GitLab QA images
moved lfs blob fetch from extractspath file
Update GitLab QA dependencies
...
* upstream/master: (126 commits)
Update VERSION to 10.3.0-pre
Update CHANGELOG.md for 10.2.0
default fill color for SVGs
ignore hashed repos (for now) when using `rake gitlab:cleanup:repos`
Use Redis cache for branch existence checks
Update CONTRIBUTING.md: Link definition of done to criteria
Use `make install` for Gitaly setups in non-test environments
FileUploader should check for hashed_storage?(:attachments) to use disk_path
Set the default gitlab-shell timeout to 3 hours
Update composite pipelines index to include "id"
Use arrays in Pipeline#latest_builds_with_artifacts
Fix blank states using old css
Skip confirmation user api
Custom issue tracker
Revert "check for `read_only?` first before seeing if request is disallowed"
add `#with_metadata` scope to remove a N+1 from the notes' API
Fix promoting milestone updating all issuables without milestone
Batchload blobs for diff generation
check for `read_only?` first before seeing if request is disallowed
use `Gitlab::Routing.url_helpers` instead of `Rails.application.routes.url_helpers`
...
When a project is using hashed storage, the repositories and
attachments wouldn't be saved on disk using the `full_path`. So the
migration would not do anything.
However: best to just skip moving when hashed storage is enabled.
* upstream/master: (507 commits)
Add dropdowns documentation
Convert migration to populate latest merge request ID into a background migration
Set 0.69.0 instead of latest for codeclimate image
De-duplicate background migration matchers defined in spec/support/migrations_helpers.rb
Update database_debugging.md
Update database_debugging.md
Move installation of apps higher
Change to Google Kubernetes Cluster and add internal links
Add Ingress description from official docs
Add info on creating your own k8s cluster from the cluster page
Add info about the installed apps in the Cluster docs
Resolve "lock/confidential issuable sidebar custom svg icons iteration"
Update HA README.md to clarify GitLab support does not troubleshoot DRBD.
Update license_finder to 3.1.1
Make sure NotesActions#noteable returns a Noteable in the update action
Cache the number of user SSH keys
Adjust openid_connect_spec to use `raise_error`
Resolve "Clicking on GPG verification badge jumps to top of the page"
Add changelog for container repository path update
Update container repository path reference
...
Prior to this commit running
Namespace#force_share_with_group_lock_on_descendants would result in
updating _all_ namespaces in the namespaces table, not just the
descendants. This is the result of ActiveRecord::Relation#update_all not
taking into account the CTE. To work around this we use the CTE query as
a sub-query instead of directly calling #update_all.
To prevent this from happening the relations returned by
Gitlab::GroupHierarchy are now marked as read-only, resulting in an
error being raised when methods such as #update_all are used.
Fortunately on GitLab.com our statement timeouts appear to have
prevented this query from actually doing any damage other than causing
a very large amount of dead tuples.
Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/37916
This adds a bunch of checks to migrations that may create or drop
triggers. Dropping triggers/functions is done using "IF EXISTS" so we
don't throw an error if the object in question has already been dropped.
We now also raise a custom error (message) when the user does not have
TRIGGER privileges. This should prevent the schema from entering an
inconsistent state while also providing the user with enough information
on how to solve the problem.
The recommendation of using SUPERUSER permissions is a bit extreme but
we require this anyway (Omnibus also configures users with this
permission).
Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/36633
Due to a missing `on_delete: :cascade`, users would hit the error that
looked like:
```
PG::ForeignKeyViolation: ERROR: update or delete on table "protected_tags"
violates foreign key constraint "fk_rails_f7dfda8c51" on table
"protected_tag_create_access_levels" DETAIL: Key (id)=(1385) is still
referenced from table "protected_tag_create_access_levels". : DELETE FROM
"protected_tags" WHERE "protected_tags"."id" = 1385
```
Closes#36013
These attributes are stored in binary in the database, but exposed as
strings. This allows one to query/create data using plain SHA1 hashes as
Strings, while storing them more efficiently as binary.
* master: (56 commits)
File view buttons
Don't reset the session when the example failed, because we need capybara-screenshot to have access to it
Resolve "MR comment + system note highlight don't have the same width"
Add feature spec for dashboard state filter tabs
Wording of Mysql support.
a new feature checklist and more elaborate documentation requirements
Filter archived project in API v3 only if param present
Revert to using links instead of buttons in Issuable Index tabs.
Do not run the codeclimate job on docs-only changes
Only show gray footer space if environment actions exist
Migrate Gitlab::Git::Blob.find to Gitaly
Backport filtered search lazy token consistent state fix
Add a comment explaining how the branch clean up happens
Fix Github::Representation::PullRequest#source_branch_exists?
Add CHANGELOG
Fix GitHub importer performance on branch existence check
Rebuild the dynamic path before validating it
Rename stage ref migration specs to match a class name
Enable Style/DotPosition Rubocop 👮
Revert "Merge branch 'winh-merge-request-related-issues' into 'master'"
...
Conflicts:
db/post_migrate/20170526185921_migrate_build_stage_reference.rb
When using update_column_in_batches the upper limit on the batch size is
now 1000. This ensures that for very large tables we don't lock tens of
thousands of rows during the update. This in turn should reduce the
likelyhood of running into deadlocks.
MySQL doesn't allow us to create a trigger for a column that doesn't
exist yet. Failing with this error:
```
Mysql2::Error: Unknown column 'build_events' in 'NEW': CREATE TRIGGER trigger_6a80c097c862_insert
BEFORE INSERT
ON `services`
FOR EACH ROW
SET NEW.`build_events` = NEW.`job_events`
```
Creating the new column before creating the trigger avoids this.
Starting with GitLab 9.1.0 we will no longer allow downtime migrations
unless absolutely necessary. This commit updates the various developer
guides and adds code that is necessary to make zero downtime migrations
less painful.
This was initially not implemented simply because I forgot about the
size limit of constraint names in PostgreSQL (63 bytes). Using the old
technique we can't add foreign keys for certain tables. For example,
adding a foreign key on
protected_branch_merge_access_levels.protected_branch_id would lead to
the following key name:
fk_protected_branch_merge_access_levels_protected_branches_protected_branch_id
This key is 78 bytes long, thus violating the PostgreSQL size
requirements.
The hashing strategy is copied from Rails' foreign_key_name() method,
which unfortunately is private and subject to change without notice.
This method allows one to create foreign keys without blocking access to
the source table, but only on PostgreSQL.
When creating a regular foreign key the "ALTER TABLE" statement used for
this won't return until all data has been validated. This statement in
turn will acquire a lock on the source table. As a result this lock can
be held for quite a long amount of time, depending on the number of rows
and system load.
By breaking up the foreign key creation process in two steps (creation,
and validation) we can reduce the amount of locking to a minimum.
Locking is still necessary for the "ALTER TABLE" statement that adds the
constraint, but this is a fast process and so will only block access for
a few milliseconds.
- Don't use `TableReferences` - using `.arel_table` is shorter!
- Move some database-related code to `Gitlab::Database`
- Remove the `MergeRequest#issues_closed` and
`Issue#closed_by_merge_requests` associations. They were either
shadowing or were too similar to existing methods. They are not being
used anywhere, so it's better to remove them to reduce confusion.
- Use Rails 3-style validations
- Index for `MergeRequest::Metrics#first_deployed_to_production_at`
- Only include `CycleAnalyticsHelpers::TestGeneration` for specs that
need it.
- Other minor refactorings.
- Move things common to `Issue` and `MergeRequest` into `Issuable`
- Move more database-specific functions into `Gitlab::Database`
- Indentation changes and other minor refactorings.
1. Change multiple updates to a single `update_all`
2. Use cascading deletes
3. Extract an average function for the database median.
4. Move database median to `lib/gitlab/database`
5. Use `delete_all` instead of `destroy_all`
6. Minor refactoring
Long-running migrations may take more than the timeout allowed by
the database. Disable the session's statement timeout to ensure
migrations don't get killed prematurely.
This changes update_column_in_batches to ensure it always updates all
rows now. These changes also allow for an extra SELECT query to be
removed, nor does it use the row count for determining offsets and the
likes; instead it's only used to determine the batch size.
This ensures that whatever locks are acquired aren't held onto until the
end of the transaction (= after _all_ rows have been updated). Timing
wise there's also no difference between using a transaction and not
using one.
By passing a block to update_column_in_batches() one can now customize
the queries executed. This in turn can be used to only update a specific
set of rows instead of simply all the rows in the table.
Instead of updating a fixed number of rows (based on the amount of rows
available at the start of the update) the method
"update_column_in_batches" will now continue updating rows until it runs
out of rows to process.
For a table with a high rate of inserts this may result in the migration
taking quite some time. However, the alternative is not all rows being
updated or the "change_column_null" method raising an error due to there
being NULL values.
Andreas Brandl
Tiago Botelho
Yorick Peterse
🙈 jacopo beschi 🙉
Lin Jen-Shin
Douwe Maan
Bob Van Landuyt
Sean McGivern
Douwe Maan
Michael Kozono
Grzegorz Bizon
Stan Hu
Paul Charlton
Bob Van Landuyt
Grzegorz Bizon
blackst0ne
Nick Thomas
Rémy Coutable
James Lopez
James Lopez
Timothy Andrew
Drew Blessing