1 files changed, 30 insertions, 0 deletions
diff --git a/db/post_migrate/20210219102900_reschedule_set_default_iteration_cadences.rb b/db/post_migrate/20210219102900_reschedule_set_default_iteration_cadences.rb
new file mode 100644
index 00000000000..6c7b46737aa
--- /dev/null
+++ b/db/post_migrate/20210219102900_reschedule_set_default_iteration_cadences.rb
@@ -0,0 +1,30 @@
+# frozen_string_literal: true
+
+class RescheduleSetDefaultIterationCadences < ActiveRecord::Migration[6.0]
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+  BATCH_SIZE = 1_000
+  DELAY_INTERVAL = 2.minutes.to_i
+  MIGRATION_CLASS = 'SetDefaultIterationCadences'
+
+  class Iteration < ActiveRecord::Base # rubocop:disable Style/Documentation
+    include EachBatch
+
+    self.table_name = 'sprints'
+  end
+
+  disable_ddl_transaction!
+
+  def up
+    Iteration.select(:group_id).distinct.each_batch(of: BATCH_SIZE, column: :group_id) do |batch, index|
+      group_ids = batch.pluck(:group_id)
+
+      migrate_in(index * DELAY_INTERVAL, MIGRATION_CLASS, group_ids)
+    end
+  end
+
+  def down
+    # Not needed
+  end
+end