1 files changed, 30 insertions, 0 deletions
diff --git a/db/post_migrate/20201102073808_schedule_blocked_by_links_replacement_second_try.rb b/db/post_migrate/20201102073808_schedule_blocked_by_links_replacement_second_try.rb
new file mode 100644
index 00000000000..217d4f81d26
--- /dev/null
+++ b/db/post_migrate/20201102073808_schedule_blocked_by_links_replacement_second_try.rb
@@ -0,0 +1,30 @@
+# frozen_string_literal: true
+
+class ScheduleBlockedByLinksReplacementSecondTry < ActiveRecord::Migration[6.0]
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+  INTERVAL = 2.minutes
+  # at the time of writing there were 12931 blocked_by issues:
+  # estimated time is 13 batches * 2 minutes -> 26 minutes
+  BATCH_SIZE = 1000
+  MIGRATION = 'ReplaceBlockedByLinks'
+
+  disable_ddl_transaction!
+
+  class IssueLink < ActiveRecord::Base
+    include EachBatch
+
+    self.table_name = 'issue_links'
+  end
+
+  def up
+    relation = IssueLink.where(link_type: 2)
+
+    queue_background_migration_jobs_by_range_at_intervals(
+      relation, MIGRATION, INTERVAL, batch_size: BATCH_SIZE)
+  end
+
+  def down
+  end
+end