ActiveAdmin Timeout count on heroku

Question

我在过滤器后的用户索引页面上在 heroko 上收到了很多 H12 超时，这是我的活动管理员页面：

 ActiveAdmin.register User do
  menu :parent => 'Users'
  actions :all, :except => [:destroy, :new]

  filter :first_name, :as => :string
  filter :last_name, :as => :string
  filter :email, :as => :string, filters: [:starts_with]
  filter :kind, as: :select, collection: User::KINDS
  filter :gender, as: :select, collection: User::GENDERS
  permit_params :first_name, :last_name, :email, :status, :kind,
                :raw_password, :referrer_code
  index pagination_total: false  do
    column(:id){|u| link_to u.id, [:admin, u]}
    column :first_name
    column :last_name
    column :email
    column :kind
    column :gender
    column :created_at
    actions
  end
  form do |f|
    f.inputs "User Details" do
      f.input :first_name
      f.input :last_name
      f.input :email, as: :email
      f.input :raw_password, label: "New Password", hint: "Leave it blank to keep the current password"
      f.input :status, as: :select, collection: User::STATUSES
      f.input :kind, as: :select, collection: User::KINDS
      f.input :gender, as: :select, collection: User::GENDERS
      f.input :birthday, as: :date_picker
    end
    f.actions
  end

我可以在日志上看到多个计数，例如：

Started GET "/admin/users?utf8=%E2%9C%93&q%5Bfirst_name_contains%5D=&q%5Blast_name_contains%5D=&q%5Bemail_starts_with%5D=rdude244%40hotmail.com&q%5Bkind_eq%5D=&q%5Bgender_eq%5D=&commit=Filter&order=id_desc" for ::1 at 2017-11-01 10:03:05 -0400
Processing by Admin::UsersController#index as HTML
  Parameters: {"utf8"=>"✓", "q"=>{"first_name_contains"=>"", "last_name_contains"=>"", "email_starts_with"=>"[e-mail]", "kind_eq"=>"", "gender_eq"=>""}, "commit"=>"Filter", "order"=>"id_desc"}
  AdminUser Load (110.8ms)  SELECT  "admin_users".* FROM "admin_users" WHERE "admin_users"."id" = $1  ORDER BY "admin_users"."id" ASC LIMIT 1  [["id", 2]]
   (1085.1ms)  SELECT COUNT(count_column) FROM (SELECT  1 AS count_column FROM "users" WHERE ("users"."email" ILIKE '[e-mail]%') LIMIT 30 OFFSET 0) subquery_for_count
  CACHE (0.0ms)  SELECT COUNT(count_column) FROM (SELECT  1 AS count_column FROM "users" WHERE ("users"."email" ILIKE '[e-mail]%') LIMIT 30 OFFSET 0) subquery_for_count
   (1105.4ms)  SELECT COUNT(count_column) FROM (SELECT  1 AS count_column FROM "users" WHERE ("users"."email" ILIKE '[e-mail]%') LIMIT 1 OFFSET 30) subquery_for_count
  CACHE (0.0ms)  SELECT COUNT(count_column) FROM (SELECT  1 AS count_column FROM "users" WHERE ("users"."email" ILIKE '[e-mail]%') LIMIT 30 OFFSET 0) subquery_for_count
  User Load (1531.4ms)  SELECT  "users".* FROM "users" WHERE ("users"."email" ILIKE '[e-mail]%')  ORDER BY "users"."id" desc LIMIT 30 OFFSET 0
  Rendered /Users/hugorincon/.rvm/gems/ruby-2.3.1@moviepass-admin/gems/activeadmin-1.1.0/app/views/active_admin/resource/index.html.arb (4034.8ms)
Completed 200 OK in 4484ms (Views: 223.2ms | ActiveRecord: 4046.2ms)

有一种方法可以删除选择计数（count_column）？以减少加载时间。

Answer 1

我认为限制 1/偏移量 30 查询来自 PaginatedCollection#build_pagination。我的猜测是其他查询也来自此模块，所以我不乐观，您可以在没有猴子补丁的情况下禁用它们。我确实看到这些查询现在使用索引的速度提高了 7-8 倍，但在 1500K 表上进行索引范围扫描仍然很慢。也许还有其他数据库问题？为了查找其他查询，我将在此模块中放置一些断点，并逐步查看会发生什么。

Answer 2

我只是删除了该请求，但每次仍然在 heroku 上超时。

英雄状态指标

Nov 02 16:21:36 moviepass-admin heroku/router:  at=error code=H12 desc="Request timeout" method=GET path="/admin/users?utf8=%E2%9C%93&q%5Bemail_starts_with%5D=Schatzinator1%40gmail.com&commit=Filter" host=cs.moviepass.com request_id=8735fd5a-4d62-462a-9f0d-9a558413c720 fwd="65.196.51.162" dyno=web.1 connect=1ms service=30000ms status=503 bytes=0 protocol=http 
Nov 02 16:21:48 moviepass-admin heroku/router:  at=error code=H12 desc="Request timeout" method=GET path="/admin/users?utf8=%E2%9C%93&q%5Bemail_starts_with%5D=gnarlynoodlez.email%40gmail.com&commit=Filter" host=cs.moviepass.com request_id=57c82b9d-c70a-4f63-88aa-e48695571e36 fwd="99.42.145.134" dyno=web.4 connect=0ms service=30000ms status=503 bytes=0 protocol=http 
Nov 02 16:22:01 moviepass-admin heroku/router:  at=error code=H12 desc="Request timeout" method=GET path="/admin/users?utf8=%E2%9C%93&q%5Bemail_starts_with%5D=Schatzinator1%40gmail.com&commit=Filter" host=cs.moviepass.com request_id=bbc5716f-af22-4b3f-93e0-2694ff62da88 fwd="200.84.242.248" dyno=web.2 connect=0ms service=30000ms status=503 bytes=0 protocol=http 
Nov 02 16:22:02 moviepass-admin heroku/router:  at=error code=H12 desc="Request timeout" method=GET path="/admin/users?utf8=%E2%9C%93&q%5Bemail_starts_with%5D=pandey.nivedita02%40gmail.com&commit=Filter" host=cs.moviepass.com request_id=729400a2-18d9-4204-931f-c8302d4a6442 fwd="184.75.152.175" dyno=web.1 connect=0ms service=30000ms status=503 bytes=0 protocol=http 

每次超时都有以下请求：

Started GET "/admin/users?utf8=%E2%9C%93&q%5Bfirst_name_contains%5D=&q%5Blast_name_contains%5D=&q%5Bemail_starts_with%5D=rdude244%40hotmail.com&q%5Bkind_eq%5D=&q%5Bgender_eq%5D=&commit=Filter&order=id_desc" for ::1 at 2017-11-01 10:03:05 -0400
Processing by Admin::UsersController#index as HTML
  Parameters: {"utf8"=>"✓", "q"=>{"first_name_contains"=>"", "last_name_contains"=>"", "email_starts_with"=>"[e-mail]", "kind_eq"=>"", "gender_eq"=>""}, "commit"=>"Filter", "order"=>"id_desc"}
  AdminUser Load (110.8ms)  SELECT  "admin_users".* FROM "admin_users" WHERE "admin_users"."id" = $1  ORDER BY "admin_users"."id" ASC LIMIT 1  [["id", 2]]
   (1085.1ms)  SELECT COUNT(count_column) FROM (SELECT  1 AS count_column FROM "users" WHERE ("users"."email" ILIKE '[e-mail]%') LIMIT 30 OFFSET 0) subquery_for_count
  CACHE (0.0ms)  SELECT COUNT(count_column) FROM (SELECT  1 AS count_column FROM "users" WHERE ("users"."email" ILIKE '[e-mail]%') LIMIT 30 OFFSET 0) subquery_for_count
  User Load (1531.4ms)  SELECT  "users".* FROM "users" WHERE ("users"."email" ILIKE '[e-mail]%')  ORDER BY "users"."id" desc LIMIT 30 OFFSET 0
  Rendered /Users/hugorincon/.rvm/gems/ruby-2.3.1@moviepass-admin/gems/activeadmin-1.1.0/app/views/active_admin/resource/index.html.arb (4034.8ms)
Completed 200 OK in 3484ms (Views: 223.2ms | ActiveRecord: 3046.2ms)

我目前使用美洲狮和 4 个标准 x2 测功机，彪马配置：

workers Integer(ENV['WEB_CONCURRENCY'] || 4)
threads_count = Integer(ENV['RAILS_MAX_THREADS'] || 2)
threads threads_count, threads_count
preload_app!
rackup      DefaultRackup
port        ENV['PORT']     || 3000
environment ENV['RACK_ENV'] || 'development'
on_worker_boot do
  ActiveSupport.on_load(:active_record) do
    config = ActiveRecord::Base.configurations[Rails.env] ||
                Rails.application.config.database_configuration[Rails.env]
    config['pool'] = ENV['RAILS_MAX_THREADS'] || 5
    ActiveRecord::Base.establish_connection(config)
  end
end