1 files changed, 47 insertions, 0 deletions
diff --git a/lib/gitlab/background_migration/backfill_group_features.rb b/lib/gitlab/background_migration/backfill_group_features.rb
new file mode 100644
index 00000000000..084c788c8cb
--- /dev/null
+++ b/lib/gitlab/background_migration/backfill_group_features.rb
@@ -0,0 +1,47 @@
+# frozen_string_literal: true
+
+module Gitlab
+  module BackgroundMigration
+    # Backfill group_features for an array of groups
+    class BackfillGroupFeatures < ::Gitlab::BackgroundMigration::BaseJob
+      include Gitlab::Database::DynamicModelHelpers
+
+      def perform(start_id, end_id, batch_table, batch_column, sub_batch_size, pause_ms, batch_size)
+        pause_ms = 0 if pause_ms < 0
+
+        parent_batch_relation = relation_scoped_to_range(batch_table, batch_column, start_id, end_id)
+        parent_batch_relation.each_batch(column: batch_column, of: sub_batch_size, order_hint: :type) do |sub_batch|
+          batch_metrics.time_operation(:upsert_group_features) do
+            upsert_group_features(sub_batch, batch_size)
+          end
+
+          sleep(pause_ms * 0.001)
+        end
+      end
+
+      def batch_metrics
+        @batch_metrics ||= Gitlab::Database::BackgroundMigration::BatchMetrics.new
+      end
+
+      private
+
+      def relation_scoped_to_range(source_table, source_key_column, start_id, stop_id)
+        define_batchable_model(source_table, connection: connection)
+          .where(source_key_column => start_id..stop_id)
+          .where(type: 'Group')
+      end
+
+      def upsert_group_features(relation, batch_size)
+        connection.execute(
+          <<~SQL
+          INSERT INTO group_features (group_id, created_at, updated_at)
+          SELECT namespaces.id as group_id, now(), now()
+          FROM namespaces
+          WHERE namespaces.type = 'Group' AND namespaces.id IN(#{relation.select(:id).limit(batch_size).to_sql})
+          ON CONFLICT (group_id) DO NOTHING;
+          SQL
+        )
+      end
+    end
+  end
+end