1 files changed, 33 insertions, 0 deletions
diff --git a/db/post_migrate/20170711145558_migrate_stages_statuses.rb b/db/post_migrate/20170711145558_migrate_stages_statuses.rb
new file mode 100644
index 00000000000..5a24fb1307f
--- /dev/null
+++ b/db/post_migrate/20170711145558_migrate_stages_statuses.rb
@@ -0,0 +1,33 @@
+class MigrateStagesStatuses < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  disable_ddl_transaction!
+
+  BATCH_SIZE = 10000
+  RANGE_SIZE = 1000
+  MIGRATION = 'MigrateStageStatus'.freeze
+
+  class Stage < ActiveRecord::Base
+    self.table_name = 'ci_stages'
+    include ::EachBatch
+  end
+
+  def up
+    Stage.where(status: nil).each_batch(of: BATCH_SIZE) do |relation, index|
+      relation.each_batch(of: RANGE_SIZE) do |batch|
+        range = relation.pluck('MIN(id)', 'MAX(id)').first
+        schedule = index * 5.minutes
+
+        BackgroundMigrationWorker.perform_in(schedule, MIGRATION, range)
+      end
+    end
+  end
+
+  def down
+    disable_statement_timeout
+
+    update_column_in_batches(:ci_stages, :status, nil)
+  end
+end