1 files changed, 29 insertions, 0 deletions
diff --git a/db/post_migrate/20210302074524_backfill_namespace_statistics_with_wiki_size.rb b/db/post_migrate/20210302074524_backfill_namespace_statistics_with_wiki_size.rb
new file mode 100644
index 00000000000..e04f69f4206
--- /dev/null
+++ b/db/post_migrate/20210302074524_backfill_namespace_statistics_with_wiki_size.rb
@@ -0,0 +1,29 @@
+# frozen_string_literal: true
+
+class BackfillNamespaceStatisticsWithWikiSize < ActiveRecord::Migration[6.0]
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+  DELAY_INTERVAL = 2.minutes.to_i
+  BATCH_SIZE = 500
+  MIGRATION = 'PopulateNamespaceStatistics'
+
+  disable_ddl_transaction!
+
+  def up
+    return unless Gitlab.ee?
+
+    groups = exec_query <<~SQL
+      SELECT group_wiki_repositories.group_id
+      FROM group_wiki_repositories
+    SQL
+
+    groups.rows.flatten.in_groups_of(BATCH_SIZE, false).each_with_index do |group_ids, index|
+      migrate_in(index * DELAY_INTERVAL, MIGRATION, [group_ids, [:wiki_size]])
+    end
+  end
+
+  def down
+    # No-op
+  end
+end