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Commit 72f428c7 authored by Yorick Peterse's avatar Yorick Peterse

Improve performance of User.by_login

Performance is improved in two steps:

1. On PostgreSQL an expression index is used for checking lower(email)
   and lower(username).
2. The check to determine if we're searching for a username or Email is
   moved to Ruby. Thanks to @haynes for suggesting and writing the
   initial implementation of this.

Moving the check to Ruby makes this method an additional 1.5 times
faster compared to doing the check in the SQL query.

With performance being improved I've now also tweaked the amount of
iterations required by the User.by_login benchmark. This method now runs
between 900 and 1000 iterations per second.
parent fb778562
......@@ -2,6 +2,7 @@ Please view this file on the master branch, on stable branches it's out of date.
v 8.1.0 (unreleased)
- Make diff file view easier to use on mobile screens (Stan Hu)
- Improved performance of finding users by username or Email address
- Add support for creating directories from Files page (Stan Hu)
- Allow removing of project without confirmation when JavaScript is disabled (Stan Hu)
- Support filtering by "Any" milestone or issue and fix "No Milestone" and "No Label" filters (Stan Hu)
......@@ -68,6 +68,7 @@ class User < ActiveRecord::Base
include Referable
include Sortable
include TokenAuthenticatable
include CaseSensitivity
default_value_for :admin, false
default_value_for :can_create_group, gitlab_config.default_can_create_group
......@@ -273,8 +274,13 @@ def search(query)
def by_login(login)
where('lower(username) = :value OR lower(email) = :value',
value: login.to_s.downcase).first
return nil unless login
if login.include?('@'.freeze)
unscoped.iwhere(email: login).take
unscoped.iwhere(username: login).take
def find_by_username!(username)
class AddUsersLowerUsernameEmailIndexes < ActiveRecord::Migration
def up
return unless Gitlab::Database.postgresql?
execute 'CREATE INDEX CONCURRENTLY index_on_users_lower_username ON users (LOWER(username));'
execute 'CREATE INDEX CONCURRENTLY index_on_users_lower_email ON users (LOWER(email));'
def down
return unless Gitlab::Database.postgresql?
remove_index :users, :index_on_users_lower_username
remove_index :users, :index_on_users_lower_email
require Rails.root.join('db/migrate/20151007120511_namespaces_projects_path_lower_indexes')
require Rails.root.join('db/migrate/20151008110232_add_users_lower_username_email_indexes')
desc 'GitLab | Sets up PostgreSQL'
task setup_postgresql: :environment do
......@@ -11,7 +11,9 @@
let(:iterations) { 1000 }
# The iteration count is based on the query taking little over 1 ms when
# using PostgreSQL.
let(:iterations) { 900 }
describe 'using a capitalized username' do
benchmark_subject { User.by_login('Alice') }
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