Add cleanup migration for MR's mutliple assigneesid-clean-up-mr-assignees-migration

The migration steals the remaining background jobs
of populating MRs with assignees, executes them
synchronously and then makes sure that all the
assignees are migrated

1 files changed, 20 insertions, 0 deletions

diff --git a/db/post_migrate/20190702173936_populate_remaining_merge_request_assignees.rb b/db/post_migrate/20190702173936_populate_remaining_merge_request_assignees.rb
new file mode 100644
index 00000000000..c435b94015d
--- /dev/null
+++ b/db/post_migrate/20190702173936_populate_remaining_merge_request_assignees.rb
@@ -0,0 +1,20 @@
+# frozen_string_literal: true
+
+# See http://doc.gitlab.com/ce/development/migration_style_guide.html
+# for more information on how to write migrations for GitLab.
+
+class PopulateRemainingMergeRequestAssignees < ActiveRecord::Migration[5.1]
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+  BATCH_SIZE = 10_000
+  MIGRATION = 'PopulateMergeRequestAssigneesTable'
+
+  disable_ddl_transaction!
+
+  def up
+    Gitlab::BackgroundMigration.steal(MIGRATION)
+
+    Gitlab::BackgroundMigration::PopulateMergeRequestAssigneesTable.new.perform_all_sync(batch_size: BATCH_SIZE)
+  end
+end