Use concurrent way of adding foreign keys

db/migrate/20170921154104_create_board_filters_table.rb

 class CreateBoardFiltersTable < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
   DOWNTIME = false
 
+  disable_ddl_transaction!
+
   def up
     create_table :board_filters do |t|
       t.integer :board_id, null: false, index: true
@@ -11,10 +15,10 @@ class CreateBoardFiltersTable < ActiveRecord::Migration
       t.integer :assignee_id, index: true
     end
 
-    add_foreign_key :board_filters, :boards, column: :board_id, on_delete: :cascade
-    add_foreign_key :board_filters, :milestones, column: :milestone_id, on_delete: :nullify
-    add_foreign_key :board_filters, :users, column: :author_id, on_delete: :nullify
-    add_foreign_key :board_filters, :users, column: :assignee_id, on_delete: :nullify
+    add_concurrent_foreign_key :board_filters, :boards, column: :board_id, on_delete: :cascade
+    add_concurrent_foreign_key :board_filters, :milestones, column: :milestone_id, on_delete: :nullify
+    add_concurrent_foreign_key :board_filters, :users, column: :author_id, on_delete: :nullify
+    add_concurrent_foreign_key :board_filters, :users, column: :assignee_id, on_delete: :nullify
   end
 
   def down

db/migrate/20170921203824_create_board_filter_labels.rb

 class CreateBoardFilterLabels < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
   DOWNTIME = false
 
-  def change
+  disable_ddl_transaction!
+
+  def up
     create_table :board_filter_labels do |t|
       t.integer :board_filter_id, null: false, index: true
       t.integer :label_id, null: false, index: true
     end
 
-    add_foreign_key :board_filter_labels, :board_filters, column: :board_filter_id, on_delete: :cascade
-    add_foreign_key :board_filter_labels, :labels, column: :label_id, on_delete: :cascade
+    add_concurrent_foreign_key :board_filter_labels, :board_filters, column: :board_filter_id, on_delete: :cascade
+    add_concurrent_foreign_key :board_filter_labels, :labels, column: :label_id, on_delete: :cascade
+  end
+
+  def down
+    drop_table :board_filter_labels
   end
 end

db/schema.rb

@@ -2069,12 +2069,12 @@ ActiveRecord::Schema.define(version: 20170921203824) do
 
   add_foreign_key "approvals", "merge_requests", name: "fk_310d714958", on_delete: :cascade
   add_foreign_key "approver_groups", "namespaces", column: "group_id", on_delete: :cascade
-  add_foreign_key "board_filter_labels", "board_filters", on_delete: :cascade
-  add_foreign_key "board_filter_labels", "labels", on_delete: :cascade
-  add_foreign_key "board_filters", "boards", on_delete: :cascade
-  add_foreign_key "board_filters", "milestones", on_delete: :nullify
-  add_foreign_key "board_filters", "users", column: "assignee_id", on_delete: :nullify
-  add_foreign_key "board_filters", "users", column: "author_id", on_delete: :nullify
+  add_foreign_key "board_filter_labels", "board_filters", name: "fk_ebc90d2f1a", on_delete: :cascade
+  add_foreign_key "board_filter_labels", "labels", name: "fk_91e18fdcee", on_delete: :cascade
+  add_foreign_key "board_filters", "boards", name: "fk_87e919b0eb", on_delete: :cascade
+  add_foreign_key "board_filters", "milestones", name: "fk_37d28eeebc", on_delete: :nullify
+  add_foreign_key "board_filters", "users", column: "assignee_id", name: "fk_e7893dfa6e", on_delete: :nullify
+  add_foreign_key "board_filters", "users", column: "author_id", name: "fk_b341da4d2b", on_delete: :nullify
   add_foreign_key "boards", "namespaces", column: "group_id", name: "fk_1e9a074a35", on_delete: :cascade
   add_foreign_key "boards", "projects", name: "fk_f15266b5f9", on_delete: :cascade
   add_foreign_key "chat_teams", "namespaces", on_delete: :cascade