Reschedule background migration to copy container_registry_enabled

The previous background migration missed 10 jobs, so this time we
will be tracking the jobs by passing in the track_jobs: true
parameter.

changelogs/unreleased/18792-reschedule-background-migration.yml

+---
+title: Reschedule background migration to copy projects.container_registry_enabled
+  to project_features.container_registry_access_level
+merge_request: 58360
+author:
+type: added

db/post_migrate/20210226120851_move_container_registry_enabled_to_project_features.rb

@@ -16,7 +16,10 @@ class MoveContainerRegistryEnabledToProjectFeatures < ActiveRecord::Migration[6.
   end
 
   def up
-    queue_background_migration_jobs_by_range_at_intervals(Project, MIGRATION, 2.minutes, batch_size: BATCH_SIZE)
+    # no-op
+    # Superceded by db/post_migrate/20210401131948_move_container_registry_enabled_to_project_features2.rb
+
+    # queue_background_migration_jobs_by_range_at_intervals(Project, MIGRATION, 2.minutes, batch_size: BATCH_SIZE)
   end
 
   def down

db/post_migrate/20210401131948_move_container_registry_enabled_to_project_features2.rb

+# frozen_string_literal: true
+
+class MoveContainerRegistryEnabledToProjectFeatures2 < ActiveRecord::Migration[6.0]
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  BATCH_SIZE = 21_000
+  MIGRATION = 'MoveContainerRegistryEnabledToProjectFeature'
+
+  disable_ddl_transaction!
+
+  class Project < ActiveRecord::Base
+    include EachBatch
+    self.table_name = 'projects'
+  end
+
+  def up
+    delete_queued_jobs('MoveContainerRegistryEnabledToProjectFeature')
+
+    queue_background_migration_jobs_by_range_at_intervals(Project, MIGRATION, 2.minutes, batch_size: BATCH_SIZE, track_jobs: true)
+  end
+
+  def down
+    # no-op
+  end
+end

db/schema_migrations/20210401131948

+cbc1cd66cdbe08ac9edee14da255343acdcd8adaea6748ee82980462ae4bb88f
\ No newline at end of file

lib/gitlab/background_migration/move_container_registry_enabled_to_project_feature.rb

@@ -6,7 +6,7 @@ module Gitlab
     # project_features.container_registry_access_level for the projects within
     # the given range of ids.
     class MoveContainerRegistryEnabledToProjectFeature
-      MAX_BATCH_SIZE = 1_000
+      MAX_BATCH_SIZE = 300
 
       module Migratable
         # Migration model namespace isolated from application code.

spec/migrations/move_container_registry_enabled_to_project_features_spec.rb → spec/migrations/move_container_registry_enabled_to_project_features2_spec.rb

 # frozen_string_literal: true
 
 require 'spec_helper'
-require Rails.root.join('db', 'post_migrate', '20210226120851_move_container_registry_enabled_to_project_features.rb')
+require Rails.root.join('db', 'post_migrate', '20210401131948_move_container_registry_enabled_to_project_features2.rb')
 
-RSpec.describe MoveContainerRegistryEnabledToProjectFeatures, :migration do
+RSpec.describe MoveContainerRegistryEnabledToProjectFeatures2, :migration do
   let(:namespace) { table(:namespaces).create!(name: 'gitlab', path: 'gitlab-org') }
 
   let!(:projects) do
@@ -30,6 +30,10 @@ RSpec.describe MoveContainerRegistryEnabledToProjectFeatures, :migration do
   it 'schedules jobs for ranges of projects' do
     migrate!
 
+    # Since track_jobs is true, each job should have an entry in the background_migration_jobs
+    # table.
+    expect(table(:background_migration_jobs).count).to eq(2)
+
     expect(described_class::MIGRATION)
       .to be_scheduled_delayed_migration(2.minutes, projects[0].id, projects[2].id)