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class BuildUserInteractedProjectsTable < ActiveRecord::Migration
include Gitlab::Database::MigrationHelpers
# Set this constant to true if this migration requires downtime.
DOWNTIME = false
disable_ddl_transaction!
def up
if Gitlab::Database.postgresql?
PostgresStrategy.new
else
MysqlStrategy.new
end.up
unless index_exists?(:user_interacted_projects, [:project_id, :user_id])
add_concurrent_index :user_interacted_projects, [:project_id, :user_id], unique: true
end
unless foreign_key_exists?(:user_interacted_projects, :user_id)
add_concurrent_foreign_key :user_interacted_projects, :users, column: :user_id, on_delete: :cascade
end
unless foreign_key_exists?(:user_interacted_projects, :project_id)
add_concurrent_foreign_key :user_interacted_projects, :projects, column: :project_id, on_delete: :cascade
end
end
def down
execute "TRUNCATE user_interacted_projects"
if foreign_key_exists?(:user_interacted_projects, :user_id)
remove_foreign_key :user_interacted_projects, :users
end
if foreign_key_exists?(:user_interacted_projects, :project_id)
remove_foreign_key :user_interacted_projects, :projects
end
if index_exists_by_name?(:user_interacted_projects, 'index_user_interacted_projects_on_project_id_and_user_id')
remove_concurrent_index_by_name :user_interacted_projects, 'index_user_interacted_projects_on_project_id_and_user_id'
end
end
private
# Rails' index_exists? doesn't work when you only give it a table and index
# name. As such we have to use some extra code to check if an index exists for
# a given name.
def index_exists_by_name?(table, index)
indexes_for_table[table].include?(index)
end
def indexes_for_table
@indexes_for_table ||= Hash.new do |hash, table_name|
hash[table_name] = indexes(table_name).map(&:name)
end
end
def foreign_key_exists?(table, column)
foreign_keys(table).any? do |key|
key.options[:column] == column.to_s
end
end
class PostgresStrategy < ActiveRecord::Migration
include Gitlab::Database::MigrationHelpers
BATCH_SIZE = 100_000
SLEEP_TIME = 5
def up
with_index(:events, [:author_id, :project_id], name: 'events_user_interactions_temp', where: 'project_id IS NOT NULL') do
iteration = 0
records = 0
begin
Rails.logger.info "Building user_interacted_projects table, batch ##{iteration}"
result = execute <<~SQL
INSERT INTO user_interacted_projects (user_id, project_id)
SELECT e.user_id, e.project_id
FROM (SELECT DISTINCT author_id AS user_id, project_id FROM events WHERE project_id IS NOT NULL) AS e
LEFT JOIN user_interacted_projects ucp USING (user_id, project_id)
WHERE ucp.user_id IS NULL
LIMIT #{BATCH_SIZE}
SQL
iteration += 1
records += result.cmd_tuples
Rails.logger.info "Building user_interacted_projects table, batch ##{iteration} complete, created #{records} overall"
Kernel.sleep(SLEEP_TIME) if result.cmd_tuples > 0
rescue ActiveRecord::InvalidForeignKey => e
Rails.logger.info "Retry on InvalidForeignKey: #{e}"
retry
end while result.cmd_tuples > 0
end
execute "ANALYZE user_interacted_projects"
end
private
def with_index(*args)
add_concurrent_index(*args) unless index_exists?(*args)
yield
ensure
remove_concurrent_index(*args) if index_exists?(*args)
end
end
class MysqlStrategy < ActiveRecord::Migration
include Gitlab::Database::MigrationHelpers
def up
execute <<~SQL
INSERT INTO user_interacted_projects (user_id, project_id)
SELECT e.user_id, e.project_id
FROM (SELECT DISTINCT author_id AS user_id, project_id FROM events WHERE project_id IS NOT NULL) AS e
LEFT JOIN user_interacted_projects ucp USING (user_id, project_id)
WHERE ucp.user_id IS NULL
SQL
end
end
end
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