Technically, a talk | RailsConf 2020

by Eileen M. Uchitelle

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Hello! I’m Eileen M. Uchitelle! Work @GitHub Member of Rails Core Find me @eileencodes

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Technically, a Talk

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Jan 18 Feb 18 Mar 18 Apr 18 May 18 Jun 18 Jul 18 Aug 18 Sep 18 Oct 18 Nov 18 Dec 18 Jan 19 Feb 19 Mar 19 Apr 19 May 19 Jun 19 Jul 19 Aug 19 Sep 19 Oct 19 Nov 19 Dec 19 Jan 20 Feb 20 Mar 20 Apr 20 May 20 #31727 #33760 #36439 #36371 #36886 #38235 #38444 #32075 #32271 #32396 #32274 #33637 #33770 #34495 #34969 #35102 #35242 #36560 #36565 #36756 #36770 #36814 #37185 #37182 #37231 #37276 #37277 #37279 #37280 #37695 #37873 #37963 #38008 #38004 #34495 #38536 #38609 #32774 #33748 #35479 #35663 #36023 #36039 #36237 *d83ab #36824 #37223 #37242 #37291 #37230 #37365 *48d58 *0a353 #35073 #35130 #35237 #36469 #36834 #36868 #38042 #37298 #37364 #37368 #37443 #38011 #37280 #38209 #33877 #34052 #34505 #34054 #34491 #34632 #34753 #35042 #35123 #35089 #35899 #36394 #37065 #37180 #37199 #37503 #37296 #37408 #37622 #37874 #38258 #38339 #39190 #38531 #38580 #38581 #38672 #38670 #38920 #38684 #38770

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Jan 18 Feb 18 Mar 18 Apr 18 May 18 Jun 18 Jul 18 Aug 18 Sep 18 Oct 18 Nov 18 Dec 18 Jan 19 Feb 19 Mar 19 Apr 19 May 19 Jun 19 Jul 19 Aug 19 Sep 19 Oct 19 Nov 19 Dec 19 Jan 20 Feb 20 Mar 20 Apr 20 May 20 #31727 #33760 #36439 #36371 #36886 #38235 #38444 #32774 #33748 #35479 #35663 #36023 #36039 #36237 *d83ab #36824 #37223 #37242 #37291 #37230 #37365 *48d58 *0a353 #38770 #32075 #32271 #32396 #32274 #33637 #33770 #34495 #34969 #35102 #35242 #36560 #36565 #36756 #36770 #36814 #37185 #37182 #37231 #37276 #37277 #37279 #37280 #37695 #37873 #37963 #38008 #38004 #34495 #38536 #38609 #37298 #37364 #37368 #37443 #38011 #37280 #38209 #38684 #38670 #38920

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Jan 18 Feb 18 Mar 18 Apr 18 May 18 Jun 18 Jul 18 Aug 18 Sep 18 Oct 18 Nov 18 Dec 18 Jan 19 Feb 19 Mar 19 Apr 19 May 19 Jun 19 Jul 19 Aug 19 Sep 19 Oct 19 Nov 19 Dec 19 Jan 20 Feb 20 Mar 20 Apr 20 May 20 #31727 #33760 #36439 #36371 #36886 #38235 #38444 #32774 #33748 #35479 #35663 #36023 #36039 #36237 *d83ab #36824 #37223 #37242 #37291 #37230 #37365 *48d58 *0a353 #33877 #34052 #34505 #34054 #34491 #34632 #34753 #35042 #35123 #35089 #35899 #36394 #37065 #37180 #37199 #37503 #37296 #37408 #37622 #37874 #38258 #38339 #39190 #38531 #38580 #38581 #38672 #32075 #32271 #32396 #32274 #33637 #33770 #34495 #34969 #35102 #35242 #36560 #36565 #36756 #36770 #36814 #37185 #37182 #37231 #37276 #37277 #37279 #37280 #37695 #37873 #37963 #38008 #38004 #34495 #38536 #38609 #37298 #37364 #37368 #37443 #38011 #37280 #38209 #38684 #38670 #38920 #38770

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What are multiple databases?

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Application Demo

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Design & Architecture

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What are multiple databases?

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PRODUCTION APPLICATION Standard setup

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APPLICATION Horizontal sharding ROWS A-I ROWS J-R ROWS S-Z PRODUCTION

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APPLICATION Functional partitioning PRODUCTION MEALS PRODUCTION SIDES PRODUCTION DESSERTS

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APPLICATION Read replicas PRODUCTION REPLICA 1 REPLICA 2 REPLICA 3

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Application Demo

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Recipes Application APPLICATION

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APPLICATION Recipes Application PRIMARY

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Recipes Application MEALS APPLICATION PRIMARY

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Recipes Application MEALS APPLICATION PRIMARY REPLICA REPLICAS

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Design & Architecture

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bin/rails g scaffold DinnerRecipe title:string recipe:text --database meals_default

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Jan 18 Feb 18 Mar 18 Apr 18 May 18 Jun 18 Jul 18 Aug 18 Sep 18 Oct 18 Nov 18 Dec 18 Jan 19 Feb 19 Mar 19 Apr 19 May 19 Jun 19 Jul 19 Aug 19 Sep 19 Oct 19 Nov 19 Dec 19 Jan 20 Feb 20 Mar 20 Apr 20 May 20 #32075 #32271 #32396 #32274 #33637 #33770 #34495 #34969 #35102 #35242 #36560 #36565 #36756 #36770 #36814 #37185 #37182 #37231 #37276 #37277 #37279 #37280 #37695 #37873 #37963 #38008 #38004 #34495 #38536 #38609 #37298 #37364 #37368 #37443 #38011 #37280 #38209 Database Conﬁgurations #38670 #38920

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development: database: recipes_development test: database: recipes_test production: database: recipes_production

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{ "development" => { "database" => "recipes_development" }, "test" => { "database" => "recipes_test" }, "production" => { "database" => "recipes_production" } }

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development: primary: database: recipes_development primary_replica: database: recipes_development replica: true test: primary: database: recipes_test primary_replica: database: recipes_test replica: true production: primary: database: recipes_production primary_replica: database: recipes_production replica: true

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{ "development" => { "primary" => { "database" => "recipes_development" }, "primary_replica" => { "database" => "recipes_development", "replica" => true }, } "test" => { "primary" => { "database" => "recipes_test" }, "primary_replica" => { "database" => "recipes_test", "replica" => true }, }, "production" => { "primary" => { "database" => "recipes_production" }, "primary_replica" => { "database" => "recipes_production", "replica" => true }, } }

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Conﬁguration as Objects

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# "mysql2", :database => "recipes_app_development" } >

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DATABASE_URL= "postgres://root:pass123@localhost:9000/my_database"

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DATABASE_URL="postgres://root:pass123@localhost:9000/my_database" # "postgres", :database => "my_database", :host => "localhost", :username => "root", :password => "pass123" }, @url = "postgres://root:pass123@localhost:9000/my_database" >

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initializer "active_record.initialize_database" do ActiveSupport.on_load(:active_record) do self.connection_handlers = { writing_role => ActiveRecord::Base.default_connection_handler } self.configurations = Rails.application.config.database_configuration establish_connection end end

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def self.configurations=(config) @@configurations = ActiveRecord::DatabaseConfigurations.new(config) end module ActiveRecord class DatabaseConfigurations def initialize(configurations = {}) @configurations = build_configs(configurations) end end end

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# "mysql2", :database => "recipes_app_development" } >, # "mysql2", :database => "meals_one_development" } > ] >

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ActiveRecord::Base.configurations.configs_for( env_name: "production" )

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ActiveRecord::Base.configurations.configs_for( env_name: "production" ) # "mysql2", :database => "recipes_app_development" }>, # "mysql2", :database => "meals_one_development" }>, # "mysql2", :database => "meals_two_development" }> ] >

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ActiveRecord::Base.configurations.configs_for( env_name: "production", name: "meals_one" )

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ActiveRecord::Base.configurations.configs_for( env_name: "production", name: "meals_one" ) # "mysql2", :database => "meals_one_development" }>

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ActiveRecord::Base.configurations.configs_for( env_name: "production", include_replicas: true )

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ActiveRecord::Base.configurations.configs_for( env_name: "production", name: "meals_one" ) # "mysql2", :database => "meals_one_development", :replica => true }>

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Using Objects Everywhere

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>> db_config.configuration_hash[:database] => "meals_one_development"

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>> db_config.configuration_hash[:database] => "meals_one_development" >> db_config.database => "meals_one_development"

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{ "database" => "recipes_development", "replica" => true "adapter" => "mysql2", "reaping_frequency" => 60, "username" => "user_ro", "password" => ENV["PASSWORD"]}

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{ "database" => "recipes_development", "replica" => true "adapter" => "mysql2", "reaping_frequency" => 60, "username" => "user_ro", "password" => ENV["PASSWORD"]...} Values Rails Needs • database • host • adapter • replica • pool • reaping_frequency • checkout_timeout • idle_timeout

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{ "database" => "recipes_development", "replica" => true "adapter" => "mysql2", "reaping_frequency" => 60, "username" => "user_ro", "password" => ENV["PASSWORD"]...} • database • host • adapter • replica • pool • reaping_frequency • checkout_timeout • idle_timeout • database • host • username • password • timeout • custom settings Values Rails Needs Values Clients Need

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class HashConfig ... def checkout_timeout (configuration_hash[:checkout_timeout] || 5).to_f end def reaping_frequency configuration_hash.fetch(:reaping_frequency, 60)&.to_f end def idle_timeout timeout = configuration_hash.fetch(:idle_timeout, 300).to_f timeout if timeout > 0 end ... end

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- @checkout_timeout = (spec.db_config.configuration_hash[:checkout_timeout] && spec.db_config.configuration_hash[:checkout_timeout].to_f) || 5 - if @idle_timeout = spec.db_config.configuration_hash.fetch(:idle_timeout, 300) - @idle_timeout = @idle_timeout.to_f - @idle_timeout = nil if @idle_timeout <= 0 - end - # default max pool size to 5 - @size = (spec.db_config.configuration_hash[:pool] && spec.db_config.configuration_hash[:pool].to_i) || 5 + @checkout_timeout = spec.db_config.checkout_timeout + @idle_timeout = spec.db_config.idle_timeout + @size = spec.db_config.pool

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Jan 18 Feb 18 Mar 18 Apr 18 May 18 Jun 18 Jul 18 Aug 18 Sep 18 Oct 18 Nov 18 Dec 18 Jan 19 Feb 19 Mar 19 Apr 19 May 19 Jun 19 Jul 19 Aug 19 Sep 19 Oct 19 Nov 19 Dec 19 Jan 20 Feb 20 Mar 20 Apr 20 May 20 #32774 #33748 #35479 #35663 #36023 #36039 #36237 *d83ab #36824 #37223 #37242 #37291 #37230 #37365 *48d58 *0a353 Rails Tasks #38770

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rails db:create rails db:drop rails db:migrate rails db:reset rails db:abort_if_pending_migrations rails db:migrate:status rails db:structure:dump rails db:schema:cache:dump

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task migrate: :load_config do original_db_config = ActiveRecord::Base.connection_db_config ActiveRecord::Base.configurations.configs_for( env_name: ActiveRecord::Tasks::DatabaseTasks.env ).each do |db_config| ActiveRecord::Base.establish_connection(db_config) ActiveRecord::Tasks::DatabaseTasks.migrate end db_namespace["_dump"].invoke ensure ActiveRecord::Base.establish_connection(original_db_config) end

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rails db:create:primary rails db:create:meals_default rails db:create:meals_one rails db:create:meals_two rails db:drop:primary rails db:drop:meals_default rails db:drop:meals_one rails db:drop:meals_two rails db:migrate:primary rails db:drop:meals_default rails db:migrate:meals_one rails db:migrate:meals_two

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namespace :migrate do ActiveRecord::Tasks::DatabaseTasks.for_each(databases) do |name| desc "Migrate #{name} database for current environment" task name => :load_config do original_db_config = ActiveRecord::Base.connection_db_config db_config = ActiveRecord::Base.configurations.configs_for( env_name: Rails.env, name: name ) ActiveRecord::Base.establish_connection(db_config) ActiveRecord::Tasks::DatabaseTasks.migrate db_namespace["_dump:#{name}"].invoke ensure ActiveRecord::Base.establish_connection(original_db_config) end end end

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def load_database_yaml if path = paths["config/database"].existent.first require "rails/application/dummy_erb_compiler" yaml = Pathname.new(path) erb = DummyERB.new(yaml.read) YAML.load(erb.result) || {} else {} end end

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class DummyERB < ERB # :nodoc: def make_compiler(trim_mode) DummyCompiler.new trim_mode end end class DummyCompiler < ERB::Compiler # :nodoc: def compile_content(stag, out) if stag == "<%=" out.push "_erbout << ''" end end end

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❌ rake db:migrate:up ❌ rake db:migrate:down ❌ rake db:rollback

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✅ rails db:migrate:up:primary ✅ rails db:migrate:up:meals_one ✅ rails db:migrate:up:meals_two ✅ rails db:migrate:down:primary ✅ rails db:migrate:down:meals_one ✅ rails db:migrate:down:meals_two ✅ rails db:rollback:primary ✅ rails db:rollback:meals_one ✅ rails db:rollback:meals_two

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Jan 18 Feb 18 Mar 18 Apr 18 May 18 Jun 18 Jul 18 Aug 18 Sep 18 Oct 18 Nov 18 Dec 18 Jan 19 Feb 19 Mar 19 Apr 19 May 19 Jun 19 Jul 19 Aug 19 Sep 19 Oct 19 Nov 19 Dec 19 Jan 20 Feb 20 Mar 20 Apr 20 May 20 Connection APIs #33877 #34052 #34505 #34054 #34491 #34632 #34753 #35042 #35123 #35089 #35899 #36394 #37065 #37180 #37199 #37503 #37296 #37408 #37622 #37874 #38258 #38339 #39190 #38531 #38580 #38581 #38672

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connects_to API

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class ApplicationRecord < ActiveRecord::Base self.abstract_class = true connects_to database: { writing: :primary, reading: :primary_replica } end

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class ApplicationRecord < ActiveRecord::Base self.abstract_class = true connects_to database: { writing: :primary, reading: :primary_replica } end Role

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class ApplicationRecord < ActiveRecord::Base self.abstract_class = true connects_to database: { writing: :primary, reading: :primary_replica } end Name

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class ApplicationRecord < ActiveRecord::Base self.abstract_class = true connects_to database: { writing: :primary, reading: :primary_replica } end

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class MealApplicationRecord < ApplicationRecord self.abstract_class = true connects_to shards: { default: { writing: :meals_default, reading: :meals_default_replica }, shard_one: { writing: :meals_one, reading: :meals_one_replica } shard_two: { writing: :meals_two, reading: :meals_two_replica } } end

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connected_to API

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ActiveRecord::Base.connected_to(role: :reading) do User.first DinnerRecipe.first end

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ActiveRecord::Base.connected_to(role: :reading) do DinnerRecipe.create! # boom end => ActiveRecord::ReadOnlyError

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ActiveRecord::Base.connected_to(role: :writing, prevent_writes: true) do DinnerRecipe.create! # boom end => ActiveRecord::ReadOnlyError

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ActiveRecord::Base.connected_to(shard: :shard_two) do DinnerRecipe.create! end

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ActiveRecord::Base.connected_to( shard: :shard_two, role: :reading ) do DinnerRecipe.create! end

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ActiveRecord::Base.connected_to(shard: :shard_two) do User.create! end => ActiveRecord::ConnectionNotEstablished

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:writing

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:writing ActiveRecord::Base

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:writing ActiveRecord::Base PoolConﬁg

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:writing ActiveRecord::Base conn_spec_name PoolConﬁg

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:writing ActiveRecord::Base conn_spec_name db_conﬁg PoolConﬁg

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:writing ActiveRecord::Base conn_spec_name db_conﬁg schema_cache PoolConﬁg

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:writing ActiveRecord::Base conn_spec_name db_conﬁg schema_cache PoolConﬁg ConnectionPool

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:writing ActiveRecord::Base PoolConﬁg ConnectionPool MealApplicationR... PoolConﬁg ConnectionPool

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:writing ActiveRecord::Base :writing MealApplicationR... :reading ActiveRecord::Base PoolConfig MealApplicationR... PoolConfig ConnectionPool ConnectionPool PoolConfig ConnectionPool PoolConfig ConnectionPool

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:writing ActiveRecord::Base MealApplicationR... PoolConﬁg ConnectionPool PoolConﬁg ConnectionPool

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:writing ActiveRecord::Base PoolConfig MealApplicationR... PoolConfig ConnectionPool ConnectionPool MealApplicationR... PoolConfig ConnectionPool

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:writing ActiveRecord::Base MealApplicationR... MealApplicationR... PoolConfig ConnectionPool MealApplicationR... PoolConfig ConnectionPool PoolConfig ConnectionPool PoolConfig ConnectionPool

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:writing ActiveRecord::Base Pool Conﬁg Connection Pool :default PoolConﬁg ConnectionPool ActiveRecord::Base

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:writing :default PoolConfig ConnectionPool :shard_one PoolConfig ConnectionPool :shard_two PoolConfig ConnectionPool MealApplicationBase ActiveRecord::Base Pool Config Connection Pool :default PoolConfig ActiveRecord::Base ConnectionPool

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Jan 18 Feb 18 Mar 18 Apr 18 May 18 Jun 18 Jul 18 Aug 18 Sep 18 Oct 18 Nov 18 Dec 18 Jan 19 Feb 19 Mar 19 Apr 19 May 19 Jun 19 Jul 19 Aug 19 Sep 19 Oct 19 Nov 19 Dec 19 Jan 20 Feb 20 Mar 20 Apr 20 May 20 #35073 #35130 #35237 #36469 #36834 #36868 #38042 Automatic connection swapping

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Rails.application.configure do config.active_record.database_selector = { delay: 2.seconds } config.active_record.database_resolver = ActiveRecord::Middleware::DatabaseSelector::Resolver config.active_record.database_resolver_context = ActiveRecord::Middleware::DatabaseSelector::Resolver::Session end

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class DatabaseSelector def initialize(app, resolver_klass = nil, context_klass = nil, options = {}) @app = app @resolver_klass = resolver_klass || Resolver @context_klass = context_klass || Resolver::Session @options = options end ... end

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class DatabaseSelector def call(env) request = ActionDispatch::Request.new(env) select_database(request) do @app.call(env) end end ... end

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class DatabaseSelector def select_database(request, &blk) context = context_klass.call(request) resolver = resolver_klass.call(context, options) response = if reading_request?(request) resolver.read(&blk) else resolver.write(&blk) end resolver.update_context(response) response end end

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class Resolver # :nodoc: ... def read(&blk) if read_from_primary? read_from_primary(&blk) else read_from_replica(&blk) end end end

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class Resolver ... def read_from_primary? !time_since_last_write_ok? end def time_since_last_write_ok? Time.now - context.last_write_timestamp >= delay end end

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class Resolver ... def read_from_primary(&blk) ActiveRecord::Base.connected_to( role: ActiveRecord::Base.writing_role, prevent_writes: true ) do instrumenter.instrument("database_selector") do yield end end end end

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class Resolver ... def read_from_replica(&blk) ActiveRecord::Base.connected_to( role: ActiveRecord::Base.reading_role, prevent_writes: true ) do instrumenter.instrument("database_selector") do yield end end end end

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class Resolver ... def write_to_primary(&blk) ActiveRecord::Base.connected_to( role: ActiveRecord::Base.writing_role, prevent_writes: false ) do instrumenter.instrument("database_selector") do yield ensure context.update_last_write_timestamp end end end end

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class Resolver class Cookie def self.call(request) new(request.cookies) end def initialize(cookies) @cookies = cookies end def update_last_write_timestamp @cookies[:last_write] = self.class.convert_time_to_timestamp(Time.now) end end end

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Thank You ❤

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Abe Uchitelle

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@searls

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@dhh

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@tenderlove

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@seejohnrun

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And all of you

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Extracting to Upstream a

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No content

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Migrations didn’t run,

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Migrations didn’t run, conﬁgurations were broken,

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Rails tasks didn’t work correctly, Migrations didn’t run, conﬁgurations were broken,

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Migrations didn’t run, conﬁgurations were broken, Rails tasks didn’t work correctly, no way for models to establish multiple connections,

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no API or pattern for auto-switching connections... Migrations didn’t run, conﬁgurations were broken, Rails tasks didn’t work correctly, no way for models to establish multiple connections,

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No content

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Jan 18 Feb 18 Mar 18 Apr 18 May 18 Jun 18 Jul 18 Aug 18 Sep 18 Oct 18 Nov 18 Dec 18 Jan 19 Feb 19 Mar 19 Apr 19 May 19 Jun 19 Jul 19 Aug 19 Sep 19 Oct 19 Nov 19 Dec 19 Jan 20 Feb 20 Mar 20 Apr 20 May 20 #31727 #33760 #36439 #36371 #36886 #38235 #38444 #32075 #32271 #32396 #32274 #33637 #33770 #34495 #34969 #35102 #35242 #36560 #36565 #36756 #36770 #36814 #37185 #37182 #37231 #37276 #37277 #37279 #37280 #37695 #37873 #37963 #38008 #38004 #34495 #38536 #38609 #37298 #37364 #37368 #37443 #38011 #37280 #38209 #32774 #33748 #35479 #35663 #36023 #36039 #36237 *d83ab #36824 #37223 #37242 #37291 #37230 #37365 *48d58 *0a353 #38770 #38684 #38670 #38920

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Jan 18 Feb 18 Mar 18 Apr 18 May 18 Jun 18 Jul 18 Aug 18 Sep 18 Oct 18 Nov 18 Dec 18 Jan 19 Feb 19 Mar 19 Apr 19 May 19 Jun 19 Jul 19 Aug 19 Sep 19 Oct 19 Nov 19 Dec 19 Jan 20 Feb 20 Mar 20 Apr 20 May 20 #31727 #33760 #36439 #36371 #36886 #38235 #38444 #32774 #33748 #35479 #35663 #36023 #36039 #36237 *d83ab #36824 #37223 #37242 #37291 #37230 #37365 *48d58 *0a353 #32075 #32271 #32396 #32274 #33637 #33770 #34495 #34969 #35102 #35242 #36560 #36565 #36756 #36770 #36814 #37185 #37182 #37231 #37276 #37277 #37279 #37280 #37695 #37873 #37963 #38008 #38004 #34495 #38536 #38609 #37298 #37364 #37368 #37443 #38011 #37280 #38209 #33877 #34052 #34505 #34054 #34491 #34632 #34753 #35042 #35123 #35089 #35899 #36394 #37065 #37180 #37199 #37503 #37296 #37408 #37622 #37874 #38258 #38339 #39190 #38531 #38580 #38581 #38672 #38684 #38670 #38920 #38770

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Jan 18 Feb 18 Mar 18 Apr 18 May 18 Jun 18 Jul 18 Aug 18 Sep 18 Oct 18 Nov 18 Dec 18 Jan 19 Feb 19 Mar 19 Apr 19 May 19 Jun 19 Jul 19 Aug 19 Sep 19 Oct 19 Nov 19 Dec 19 Jan 20 Feb 20 Mar 20 Apr 20 May 20 #31727 #33760 #36439 #36371 #36886 #38235 #38444 #32075 #32271 #32396 #32274 #33637 #33770 #34495 #34969 #35102 #35242 #36560 #36565 #36756 #36770 #36814 #37185 #37182 #37231 #37276 #37277 #37279 #37280 #37695 #37873 #37963 #38008 #38004 #34495 #38536 #38609 #32774 #33748 #35479 #35663 #36023 #36039 #36237 *d83ab #36824 #37223 #37242 #37291 #37230 #37365 *48d58 *0a353 #37298 #37364 #37368 #37443 #38011 #37280 #38209 #33877 #34052 #34505 #34054 #34491 #34632 #34753 #35042 #35123 #35089 #35899 #36394 #37065 #37180 #37199 #37503 #37296 #37408 #37622 #37874 #38258 #38339 #39190 #38531 #38580 #35073 #35130 #35237 #36469 #36834 #36868 #38042 #38684 #38670 #38920 #38770 #38581 #38672