1 files changed, 35 insertions, 0 deletions
diff --git a/db/post_migrate/20211005194425_schedule_requirements_migration.rb b/db/post_migrate/20211005194425_schedule_requirements_migration.rb
new file mode 100644
index 00000000000..56211989b8e
--- /dev/null
+++ b/db/post_migrate/20211005194425_schedule_requirements_migration.rb
@@ -0,0 +1,35 @@
+# frozen_string_literal: true
+
+class ScheduleRequirementsMigration < Gitlab::Database::Migration[1.0]
+  DOWNTIME = false
+
+  # 2021-10-05 requirements count: ~12500
+  #
+  # Using 30 as batch size and 120 seconds default interval will produce:
+  # ~420 jobs - taking ~14 hours to perform
+  BATCH_SIZE = 30
+
+  MIGRATION = 'MigrateRequirementsToWorkItems'
+
+  disable_ddl_transaction!
+
+  class Requirement < ActiveRecord::Base
+    include EachBatch
+
+    self.table_name = 'requirements'
+  end
+
+  def up
+    queue_background_migration_jobs_by_range_at_intervals(
+      Requirement.where(issue_id: nil),
+      MIGRATION,
+      2.minutes,
+      batch_size: BATCH_SIZE,
+      track_jobs: true
+    )
+  end
+
+  def down
+    # NO OP
+  end
+end