1 files changed, 25 insertions, 0 deletions
diff --git a/db/post_migrate/20190528180441_enqueue_reset_merge_status.rb b/db/post_migrate/20190528180441_enqueue_reset_merge_status.rb
new file mode 100644
index 00000000000..a3d2f497806
--- /dev/null
+++ b/db/post_migrate/20190528180441_enqueue_reset_merge_status.rb
@@ -0,0 +1,25 @@
+# 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 EnqueueResetMergeStatus < ActiveRecord::Migration[5.1]
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+  BATCH_SIZE = 10_000
+  MIGRATION = 'ResetMergeStatus'
+  DELAY_INTERVAL = 5.minutes.to_i
+
+  disable_ddl_transaction!
+
+  def up
+    say 'Scheduling `ResetMergeStatus` jobs'
+
+    # We currently have more than ~5_000_000 merge request records on GitLab.com.
+    # This means it'll schedule ~500 jobs (10k MRs each) with a 5 minutes gap,
+    # so this should take ~41 hours for all background migrations to complete.
+    # ((5_000_000 / 10_000) * 5) / 60 => 41.6666..
+    queue_background_migration_jobs_by_range_at_intervals(MergeRequest, MIGRATION, DELAY_INTERVAL, batch_size: BATCH_SIZE)
+  end
+end