RuntimeError: The connection cannot be reused in the forked process (ruby-oci8 gem)

Question

我得到

RuntimeError: The connection cannot be reused in the forked process

来自

ruby-oci8 (2.1.3) lib/oci8/cursor.rb:28:in `__initialize'

我正在为 rails 应用程序使用 oracle 数据库，最近我开始使用 unicorn 和 nginx 部署 rails 应用程序，从他们开始我收到这个错误帮助。

我正在使用 ruby 1.9.3 和 rails 3.1，这是我的 unicorn.rb 文件

rails_env = ENV['RAILS_ENV'] || 'production'

worker_processes 6

preload_app true

timeout 75

app_dir     = File.expand_path("../../..", __FILE__)
shared_path = "#{app_dir}/shared"
working_directory "#{app_dir}/current"

# Set up socket location
listen "#{shared_path}/sockets/unicorn.sock", :backlog => 64

# Set master PID location
pid "#{shared_path}/pids/unicorn.pid"

stderr_path "#{shared_path}/log/unicorn.log"
stdout_path "#{shared_path}/log/unicorn.log"

before_fork do |server, worker|
  Signal.trap 'TERM' do
    puts 'Unicorn master intercepting TERM and sending myself QUIT instead'
    Process.kill 'QUIT', Process.pid
  end

  defined?(ActiveRecord::Base) and
    ActiveRecord::Base.connection.disconnect!
end

after_fork do |server, worker|
  # reset the connection since the pre-forked connection will be stale
  Signal.trap 'TERM' do
    puts 'Unicorn worker intercepting TERM and doing nothing. Wait for master to send QUIT'
  end

  if defined?(ActiveRecord::Base)
    config = ActiveRecord::Base.configurations[Rails.env] ||
            Rails.application.config.database_configuration[Rails.env]
    config['pool'] = ENV['DB_POOL'] || 5
    ActiveRecord::Base.establish_connection(config)
  end
end

Answer 1

我得到了解决方案。基本上我的模型包含这样的 establish_connection 定义

class User < ActiveRecord::Base
  establish_connection "user_#{Rails.env}"
end

我的 unicorn.rb 文件 before_fork 块包含以下代码。

defined?(ActiveRecord::Base) and
  ActiveRecord::Base.connection.disconnect!

我发现当您在模型中显式编写 establish_connection 时，上面的代码不起作用。为了解决这个问题，我不得不将上面的代码更改为下面的代码

defined?(ActiveRecord::Base) &&
  ActiveRecord::Base.remove_connection(User) &&
  ActiveRecord::Base.connection.disconnect!

它就像一个魅力。 :-)

RuntimeError: The connection cannot be reused in the forked process (ruby-oci8 gem)

RuntimeError: The connection cannot be reused in the forked process (ruby-oci8 gem)

ruby

ruby-on-rails

nginx

unicorn