BigW Consortium Gitlab

  1. 10 Aug, 2017 1 commit
    • Migrate events into a new format · 0395c471
      Yorick Peterse authored
      This commit migrates events data in such a way that push events are
      stored much more efficiently. This is done by creating a shadow table
      called "events_for_migration", and a table called "push_event_payloads"
      which is used for storing push data of push events. The background
      migration in this commit will copy events from the "events" table into
      the "events_for_migration" table, push events in will also have a row
      created in "push_event_payloads".
      
      This approach allows us to reclaim space in the next release by simply
      swapping the "events" and "events_for_migration" tables, then dropping
      the old events (now "events_for_migration") table.
      
      The new table structure is also optimised for storage space, and does
      not include the unused "title" column nor the "data" column (since this
      data is moved to "push_event_payloads").
      
      == Newly Created Events
      
      Newly created events are inserted into both "events" and
      "events_for_migration", both using the exact same primary key value. The
      table "push_event_payloads" in turn has a foreign key to the _shadow_
      table. This removes the need for recreating and validating the foreign
      key after swapping the tables. Since the shadow table also has a foreign
      key to "projects.id" we also don't have to worry about orphaned rows.
      
      This approach however does require some additional storage as we're
      duplicating a portion of the events data for at least 1 release. The
      exact amount is hard to estimate, but for GitLab.com this is expected to
      be between 10 and 20 GB at most. The background migration in this commit
      deliberately does _not_ update the "events" table as doing so would put
      a lot of pressure on PostgreSQL's auto vacuuming system.
      
      == Supporting Both Old And New Events
      
      Application code has also been adjusted to support push events using
      both the old and new data formats. This is done by creating a PushEvent
      class which extends the regular Event class. Using Rails' Single Table
      Inheritance system we can ensure the right class is used for the right
      data, which in this case is based on the value of `events.action`. To
      support displaying old and new data at the same time the PushEvent class
      re-defines a few methods of the Event class, falling back to their
      original implementations for push events in the old format.
      
      Once all existing events have been migrated the various push event
      related methods can be removed from the Event model, and the calls to
      `super` can be removed from the methods in the PushEvent model.
      
      The UI and event atom feed have also been slightly changed to better
      handle this new setup, fortunately only a few changes were necessary to
      make this work.
      
      == API Changes
      
      The API only displays push data of events in the new format. Supporting
      both formats in the API is a bit more difficult compared to the UI.
      Since the old push data was not really well documented (apart from one
      example that used an incorrect "action" nmae) I decided that supporting
      both was not worth the effort, especially since events will be migrated
      in a few days _and_ new events are created in the correct format.
  2. 02 Aug, 2017 1 commit
  3. 27 Jul, 2017 2 commits
  4. 21 Jun, 2017 1 commit
  5. 17 May, 2017 1 commit
    • Use CTEs for nested groups and authorizations · ac382b56
      Yorick Peterse authored
      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.
  6. 21 Apr, 2017 1 commit
  7. 06 Apr, 2017 1 commit
  8. 23 Feb, 2017 3 commits
  9. 30 Jan, 2017 1 commit
    • resolve deprecation warnings · 538d1bff
      Adam Pahlevi authored
      don’t pass AR object, use the ID to avoid depr warning
      
      pass in the id instead of AR object to specs for `ProjectDestroyWorker`
  10. 26 Jan, 2017 1 commit
  11. 27 Oct, 2016 1 commit
  12. 24 Oct, 2016 1 commit
  13. 20 Oct, 2016 2 commits
    • Differentiate the expire from leave event · f488b9f7
      Callum Dryden authored
      At the moment we cannot see weather a user left a project due to their
      membership expiring of if they themselves opted to leave the project.
      This adds a new event type that allows us to make this differentiation.
      Note that is not really feasable to go back and reliably fix up the
      previous events. As a result the events for previous expire removals
      will remain the same however events of this nature going forward will be
      correctly represented.
    • Differentiate the expire from leave event · 9124310f
      Callum Dryden authored
      At the moment we cannot see weather a user left a project due to their
      membership expiring of if they themselves opted to leave the project.
      This adds a new event type that allows us to make this differentiation.
      Note that is not really feasable to go back and reliably fix up the
      previous events. As a result the events for previous expire removals
      will remain the same however events of this nature going forward will be
      correctly represented.
  14. 28 Sep, 2016 1 commit
    • Allow Member.add_user to handle access requesters · ec0061a9
      Rémy Coutable authored
      Changes include:
      
      - Ensure Member.add_user is not called directly when not necessary
      - New GroupMember.add_users_to_group to have the same abstraction level as for Project
      - Refactor Member.add_user to take a source instead of an array of members
      - Fix Rubocop offenses
      - Always use Project#add_user instead of project.team.add_user
      - Factorize users addition as members in Member.add_users_to_source
      - Make access_level a keyword argument in GroupMember.add_users_to_group and ProjectMember.add_users_to_projects
      - Destroy any requester before adding them as a member
      - Improve the way we handle access requesters in Member.add_user
        Instead of removing the requester and creating a new member,
        we now simply accepts their access request. This way, they will
        receive a "access request granted" email.
      - Fix error that was previously silently ignored
      - Stop raising when access level is invalid in Member, let Rails validation do their work
      Signed-off-by: 's avatarRémy Coutable <remy@rymai.me>
  15. 16 Sep, 2016 1 commit
  16. 30 Aug, 2016 2 commits
  17. 10 Aug, 2016 1 commit
  18. 09 Aug, 2016 1 commit
  19. 04 Aug, 2016 1 commit
  20. 12 Jul, 2016 1 commit
  21. 01 Jul, 2016 1 commit
  22. 18 Jun, 2016 1 commit
  23. 16 Jun, 2016 2 commits
  24. 14 Jun, 2016 2 commits
  25. 03 Jun, 2016 2 commits
  26. 21 May, 2016 2 commits
  27. 20 May, 2016 1 commit
  28. 09 Dec, 2015 1 commit
  29. 26 Jun, 2015 1 commit
  30. 22 Jun, 2015 1 commit
  31. 03 May, 2015 1 commit