1 files changed, 32 insertions, 0 deletions
diff --git a/db/post_migrate/20190527194900_schedule_calculate_wiki_sizes.rb b/db/post_migrate/20190527194900_schedule_calculate_wiki_sizes.rb
new file mode 100644
index 00000000000..04cf5906b61
--- /dev/null
+++ b/db/post_migrate/20190527194900_schedule_calculate_wiki_sizes.rb
@@ -0,0 +1,32 @@
+# frozen_string_literal: true
+
+class ScheduleCalculateWikiSizes < ActiveRecord::Migration[5.0]
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+  MIGRATION = 'CalculateWikiSizes'
+  BATCH_SIZE = 100000
+  BATCH_TIME = 5.minutes
+
+  class ProjectStatistics < ActiveRecord::Base
+    self.table_name = 'project_statistics'
+
+    scope :without_wiki_size, -> { where(wiki_size: nil) }
+
+    include ::EachBatch
+  end
+
+  disable_ddl_transaction!
+
+  def up
+    queue_background_migration_jobs_by_range_at_intervals(
+      ::ScheduleCalculateWikiSizes::ProjectStatistics.without_wiki_size,
+      MIGRATION,
+      BATCH_TIME,
+      batch_size: BATCH_SIZE)
+  end
+
+  def down
+    # no-op
+  end
+end