Question

我无法确定在我编写的Ruby脚本中出现以下Sequel::PoolTimeout错误的原因：

Sequel::PoolTimeout: Sequel::PoolTimeout
             hold at /Users/username/.rvm/gems/jruby-1.7.4@all/gems/sequel-4.2.0/lib/sequel/connection_pool/threaded.rb:100
             hold at /Users/username/.rvm/gems/jruby-1.7.4@all/gems/sequel-4.2.0/lib/sequel/connection_pool/threaded.rb:93
      synchronize at /Users/username/.rvm/gems/jruby-1.7.4@all/gems/sequel-4.2.0/lib/sequel/database/connecting.rb:234
          execute at /Users/username/.rvm/gems/jruby-1.7.4@all/gems/sequel-4.2.0/lib/sequel/adapters/jdbc.rb:258
          execute at /Users/username/.rvm/gems/jruby-1.7.4@all/gems/sequel-4.2.0/lib/sequel/dataset/actions.rb:793
       fetch_rows at /Users/username/.rvm/gems/jruby-1.7.4@all/gems/sequel-4.2.0/lib/sequel/adapters/jdbc.rb:671
             each at /Users/username/.rvm/gems/jruby-1.7.4@all/gems/sequel-4.2.0/lib/sequel/dataset/actions.rb:143
    single_record at /Users/username/.rvm/gems/jruby-1.7.4@all/gems/sequel-4.2.0/lib/sequel/dataset/actions.rb:583
     single_value at /Users/username/.rvm/gems/jruby-1.7.4@all/gems/sequel-4.2.0/lib/sequel/dataset/actions.rb:591
              get at /Users/username/.rvm/gems/jruby-1.7.4@all/gems/sequel-4.2.0/lib/sequel/dataset/actions.rb:250
           empty? at /Users/username/.rvm/gems/jruby-1.7.4@all/gems/sequel-4.2.0/lib/sequel/dataset/actions.rb:153
            scrap at /Users/username/projectname/processers/get_category.rb:46
             each at org/jruby/RubyArray.java:1617
  each_with_index at org/jruby/RubyEnumerable.java:920
            scrap at /Users/username/projectname/processers/get_category.rb:44
            scrap at /Users/username/projectname/processers/get_category.rb:32

我用MRI和JRuby尝试了这个结果，结果完全相同。

根据Sequel gem here上的说明，我试图提升pool_timeout限制如下：

DB = Sequel.connect("jdbc:mysql://localhost/project_db?user=USERNAME&password=PASSWD&max_connections=10&pool_timeout=120")

好像max_connections和pool_timeout似乎无法识别，但是我没有看到任何其他方法将这些args传递到连接中。

这里讨论的实际代码是： if DB[:products].where(url: url.to_s).empty?

我已经看到代码工作得很好，但是没有失败，它会立即失败，或者几分钟之后就没有任何可重复性发生。我开始怀疑这是一个MySQL配置问题或导致localhost DBMS有一些长时间延迟的事情，尽管如此，我再也无法手动重现我可以用手动查询等判断的可见超时。 / p>

关于这个问题的任何想法，关于为什么时间会继续发生，或者更具体地说，如何通过提供Sequel适当的设置（或许我有一个格式错误的arg列表）或修改MySQL的{{1}来解决它对于这种情况？

Answer 1

Sequel jdbc适配器将连接字符串直接传递给JDBC，它不解析嵌入式选项。你需要这样做：

DB = Sequel.connect("jdbc:mysql://localhost/project_db?user=USERNAME&password=PASSWD", :max_connections=>10, :pool_timeout=>120)

续集数据库连接PoolTimeout错误

1 个答案: