ruby-on-rails – 如何在增加急切加载的同时解决此错误？ “错误ThreadError：尝试解锁由另一个线程锁定的互斥锁”

2023年12月27日 199次阅读

My Rails应用程序使用inherited_resources gem.我目前正在努力加快速度,以便能够处理更大的数据集.所以我继续前进(在Bullet宝石的帮助下)使用渴望加载,这将证明是有用的.在inherited_resources中,它看起来像这样：

def collection
  my_widgets ||= end_of_association_chain.includes(:association_one, :association_two, :association_three, :association_four)

  @widgets = case params[:filter]
                  when nil then my_widgets.all
                  when 'old' then my_widgets.old
                  when 'new' then my_widgets.new
                  end

  @final_collection
end

新代码是.includes(：association_one,：association_two,：association_three,：association_four)

对于我的测试庞大的数据库,这个简单的更改加快了我在日志中的加载时间约5倍.但是,浏览器只会坐在那里,空白.没有.随着chrome加载图标去.

当我终止终端中的服务器时,我得到了这个相当独特的错误：

 ERROR ThreadError: Attempt to unlock a mutex which is locked by another thread

Backtrace在底部.

我已经尝试过在这个问题的最佳答案中讨论的解决方案：How can I serve requests concurrently with Rails 4?,具有以下内容：

#config/environments/development.rb
config.cache_classes = false
config.eager_load = true
config.allow_concurrency=true

我在这里错过了什么？为什么简单地将这些关联添加到急切的加载中,这显着加速了幕后的事情,让我对这个ThreadError的浏览器没有反应？

    /Users/johndoeuser/.rvm/gems/ruby-2.2.1/gems/rack-1.6.4/lib/rack/lock.rb:22:in `unlock'
    /Users/johndoeuser/.rvm/gems/ruby-2.2.1/gems/rack-1.6.4/lib/rack/lock.rb:22:in `ensure in call'
    /Users/johndoeuser/.rvm/gems/ruby-2.2.1/gems/rack-1.6.4/lib/rack/lock.rb:23:in `call'
    /Users/johndoeuser/.rvm/gems/ruby-2.2.1/gems/rack-1.6.4/lib/rack/content_length.rb:15:in `call'
    /Users/johndoeuser/.rvm/gems/ruby-2.2.1/gems/rack-1.6.4/lib/rack/handler/webrick.rb:88:in `service'
    /Users/johndoeuser/.rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/webrick/httpserver.rb:138:in `service'
    /Users/johndoeuser/.rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/webrick/httpserver.rb:94:in `run'
    /Users/johndoeuser/.rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/webrick/server.rb:294:in `block in start_thread'
/Users/johndoeuser/.rvm/gems/ruby-2.2.1/gems/rack-1.6.4/lib/rack/handler/webrick.rb:48:in `shutdown': undefined method `shutdown' for nil:NilClass (NoMethodError)
    from /Users/johndoeuser/.rvm/gems/ruby-2.2.1/gems/rack-1.6.4/lib/rack/server.rb:280:in `block in start'
    from /Users/johndoeuser/.rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/webrick/server.rb:206:in `call'
    from /Users/johndoeuser/.rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/webrick/server.rb:206:in `join'
    from /Users/johndoeuser/.rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/webrick/server.rb:206:in `block (2 levels) in start'
    from /Users/johndoeuser/.rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/webrick/server.rb:206:in `each'
    from /Users/johndoeuser/.rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/webrick/server.rb:206:in `block in start'
    from /Users/johndoeuser/.rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/webrick/server.rb:32:in `start'
    from /Users/johndoeuser/.rvm/rubies/ruby-2.2.1/lib/ruby/2.2.0/webrick/server.rb:162:in `start'
    from /Users/johndoeuser/.rvm/gems/ruby-2.2.1/gems/rack-1.6.4/lib/rack/handler/webrick.rb:34:in `run'
    from /Users/johndoeuser/.rvm/gems/ruby-2.2.1/gems/rack-1.6.4/lib/rack/server.rb:286:in `start'
    from /Users/johndoeuser/.rvm/gems/ruby-2.2.1/gems/railties-4.2.6/lib/rails/commands/server.rb:80:in `start'
    from /Users/johndoeuser/.rvm/gems/ruby-2.2.1/gems/railties-4.2.6/lib/rails/commands/commands_tasks.rb:80:in `block in server'
    from /Users/johndoeuser/.rvm/gems/ruby-2.2.1/gems/railties-4.2.6/lib/rails/commands/commands_tasks.rb:75:in `tap'
    from /Users/johndoeuser/.rvm/gems/ruby-2.2.1/gems/railties-4.2.6/lib/rails/commands/commands_tasks.rb:75:in `server'
    from /Users/johndoeuser/.rvm/gems/ruby-2.2.1/gems/railties-4.2.6/lib/rails/commands/commands_tasks.rb:39:in `run_command!'
    from /Users/johndoeuser/.rvm/gems/ruby-2.2.1/gems/railties-4.2.6/lib/rails/commands.rb:17:in `'
    from bin/rails:4:in `require'
    from bin/rails:4:in `'

编辑：我开始怀疑这是不是一个线程错误,而不是我的数据集太大而不能进行预先加载,是否有一个阈值,你渴望加载这么多的对象,当它在终端中快速加载时,浏览器只是永远坐在那里？

最佳答案 从WEBrick切换到
Puma是一个选项吗？我有一个需要并发请求的应用程序.我收到你描述的错误：

错误ThreadError：尝试解锁由另一个线程锁定的互斥锁

切换到Puma解决了这个问题的开箱即用.

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