1

有时，我托管在 Heroku 上的 Rails 应用程序会出现故障，我不确定发生了什么。有时可能会提前发生许多请求超时错误。然后我得到这个错误：有没有人知道可能发生了什么或者我如何进一步研究这个问题？

NilClass# (PG::Error) "SSL SYSCALL error: EOF detected\n"


/app/vendor/bundle/ruby/1.9.1/gems/activerecord-3.2.12/lib/active_record/connection_adapters/postgresql_adapter.rb:294:in `exec'/app/vendor/bundle/ruby/1.9.1/gems/activerecord-3.2.12/lib/active_record/connection_adapters/postgresql_adapter.rb:294:in `dealloc'
/app/vendor/bundle/ruby/1.9.1/gems/activerecord-3.2.12/lib/active_record/connection_adapters/postgresql_adapter.rb:278:in `block in clear'
/app/vendor/bundle/ruby/1.9.1/gems/activerecord-3.2.12/lib/active_record/connection_adapters/postgresql_adapter.rb:277:in `each_value'
/app/vendor/bundle/ruby/1.9.1/gems/activerecord-3.2.12/lib/active_record/connection_adapters/postgresql_adapter.rb:277:in `clear'
/app/vendor/bundle/ruby/1.9.1/gems/activerecord-3.2.12/lib/active_record/connection_adapters/postgresql_adapter.rb:339:in `clear_cache!'
/app/vendor/bundle/ruby/1.9.1/gems/activerecord-3.2.12/lib/active_record/connection_adapters/postgresql_adapter.rb:352:in `reconnect!'
/app/vendor/bundle/ruby/1.9.1/gems/activerecord-3.2.12/lib/active_record/connection_adapters/abstract_adapter.rb:219:in `verify!'
/app/vendor/bundle/ruby/1.9.1/gems/activerecord-3.2.12/lib/active_record/connection_adapters/abstract/connection_pool.rb:333:in `block in checkout_and_verify'
/app/vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.12/lib/active_support/callbacks.rb:403:in `_run__2596940609290925681__checkout__3309272650293367200__callbacks'
/app/vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.12/lib/active_support/callbacks.rb:405:in `__run_callback'
/app/vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.12/lib/active_support/callbacks.rb:385:in `_run_checkout_callbacks'
/app/vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.12/lib/active_support/callbacks.rb:81:in `run_callbacks'
/app/vendor/bundle/ruby/1.9.1/gems/activerecord-3.2.12/lib/active_record/connection_adapters/abstract/connection_pool.rb:332:in `checkout_and_verify'
/app/vendor/bundle/ruby/1.9.1/gems/activerecord-3.2.12/lib/active_record/connection_adapters/abstract/connection_pool.rb:253:in `block (2 levels) in checkout'
/app/vendor/bundle/ruby/1.9.1/gems/activerecord-3.2.12/lib/active_record/connection_adapters/abstract/connection_pool.rb:242:in `loop'
/app/vendor/bundle/ruby/1.9.1/gems/activerecord-3.2.12/lib/active_record/connection_adapters/abstract/connection_pool.rb:242:in `block in checkout'
/usr/local/lib/ruby/1.9.1/monitor.rb:201:in `mon_synchronize'
/app/vendor/bundle/ruby/1.9.1/gems/activerecord-3.2.12/lib/active_record/connection_adapters/abstract/connection_pool.rb:239:in `checkout'
/app/vendor/bundle/ruby/1.9.1/gems/activerecord-3.2.12/lib/active_record/connection_adapters/abstract/connection_pool.rb:102:in `block in connection'
/usr/local/lib/ruby/1.9.1/monitor.rb:201:in `mon_synchronize'
/app/vendor/bundle/ruby/1.9.1/gems/activerecord-3.2.12/lib/active_record/connection_adapters/abstract/connection_pool.rb:101:in `connection'
/app/vendor/bundle/ruby/1.9.1/gems/activerecord-3.2.12/lib/active_record/connection_adapters/abstract/connection_pool.rb:410:in `retrieve_connection'
/app/vendor/bundle/ruby/1.9.1/gems/activerecord-3.2.12/lib/active_record/connection_adapters/abstract/connection_specification.rb:171:in `retrieve_connection'
/app/vendor/bundle/ruby/1.9.1/gems/activerecord-3.2.12/lib/active_record/connection_adapters/abstract/connection_specification.rb:145:in `connection'
/app/vendor/bundle/ruby/1.9.1/gems/activerecord-3.2.12/lib/active_record/query_cache.rb:61:in `call'
/app/vendor/bundle/ruby/1.9.1/gems/activerecord-3.2.12/lib/active_record/connection_adapters/abstract/connection_pool.rb:479:in `call'
/app/vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.12/lib/action_dispatch/middleware/callbacks.rb:28:in `block in call'
/app/vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.12/lib/active_support/callbacks.rb:405:in `_run__1965518221808316025__call__3309272650293367200__callbacks'
/app/vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.12/lib/active_support/callbacks.rb:405:in `__run_callback'
/app/vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.12/lib/active_support/callbacks.rb:385:in `_run_call_callbacks'
/app/vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.12/lib/active_support/callbacks.rb:81:in `run_callbacks'
/app/vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.12/lib/action_dispatch/middleware/callbacks.rb:27:in `call'
/app/vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.12/lib/action_dispatch/middleware/remote_ip.rb:31:in `call'
/app/vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.12/lib/action_dispatch/middleware/debug_exceptions.rb:16:in `call'
/app/vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.12/lib/action_dispatch/middleware/show_exceptions.rb:56:in `call'
/app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.12/lib/rails/rack/logger.rb:32:in `call_app'
/app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.12/lib/rails/rack/logger.rb:16:in `block in call'
/app/vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.12/lib/active_support/tagged_logging.rb:22:in `tagged'
/app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.12/lib/rails/rack/logger.rb:16:in `call'
/app/vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.12/lib/action_dispatch/middleware/request_id.rb:22:in `call'
/app/vendor/bundle/ruby/1.9.1/gems/rack-1.4.5/lib/rack/methodoverride.rb:21:in `call'
/app/vendor/bundle/ruby/1.9.1/gems/rack-1.4.5/lib/rack/runtime.rb:17:in `call'
/app/vendor/bundle/ruby/1.9.1/gems/activesupport-3.2.12/lib/active_support/cache/strategy/local_cache.rb:72:in `call'
/app/vendor/bundle/ruby/1.9.1/gems/rack-1.4.5/lib/rack/lock.rb:15:in `call'
/app/vendor/bundle/ruby/1.9.1/gems/actionpack-3.2.12/lib/action_dispatch/middleware/static.rb:62:in `call'
/app/vendor/bundle/ruby/1.9.1/gems/rack-cache-1.2/lib/rack/cache/context.rb:136:in `forward'
/app/vendor/bundle/ruby/1.9.1/gems/rack-cache-1.2/lib/rack/cache/context.rb:245:in `fetch'
/app/vendor/bundle/ruby/1.9.1/gems/rack-cache-1.2/lib/rack/cache/context.rb:185:in `lookup'
/app/vendor/bundle/ruby/1.9.1/gems/rack-cache-1.2/lib/rack/cache/context.rb:66:in `call!'
/app/vendor/bundle/ruby/1.9.1/gems/rack-cache-1.2/lib/rack/cache/context.rb:51:in `call'
/app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.12/lib/rails/engine.rb:479:in `call'
/app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.12/lib/rails/application.rb:223:in `call'
/app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.12/lib/rails/railtie/configurable.rb:30:in `method_missing'
/app/vendor/bundle/ruby/1.9.1/gems/rack-1.4.5/lib/rack/static.rb:119:in `call'
/app/vendor/bundle/ruby/1.9.1/gems/rack-1.4.5/lib/rack/content_length.rb:14:in `call'
/app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.12/lib/rails/rack/log_tailer.rb:17:in `call'
/app/vendor/bundle/ruby/1.9.1/gems/thin-1.5.0/lib/thin/connection.rb:81:in `block in pre_process'
/app/vendor/bundle/ruby/1.9.1/gems/thin-1.5.0/lib/thin/connection.rb:79:in `catch'
/app/vendor/bundle/ruby/1.9.1/gems/thin-1.5.0/lib/thin/connection.rb:79:in `pre_process'
/app/vendor/bundle/ruby/1.9.1/gems/thin-1.5.0/lib/thin/connection.rb:54:in `process'
/app/vendor/bundle/ruby/1.9.1/gems/thin-1.5.0/lib/thin/connection.rb:39:in `receive_data'
/app/vendor/bundle/ruby/1.9.1/gems/eventmachine-1.0.0/lib/eventmachine.rb:187:in `run_machine'
/app/vendor/bundle/ruby/1.9.1/gems/eventmachine-1.0.0/lib/eventmachine.rb:187:in `run'
/app/vendor/bundle/ruby/1.9.1/gems/thin-1.5.0/lib/thin/backends/base.rb:63:in `start'
/app/vendor/bundle/ruby/1.9.1/gems/thin-1.5.0/lib/thin/server.rb:159:in `start'
/app/vendor/bundle/ruby/1.9.1/gems/rack-1.4.5/lib/rack/handler/thin.rb:13:in `run'
/app/vendor/bundle/ruby/1.9.1/gems/rack-1.4.5/lib/rack/server.rb:268:in `start'
/app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.12/lib/rails/commands/server.rb:70:in `start'
/app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.12/lib/rails/commands.rb:55:in `block in <top (required)>'
/app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.12/lib/rails/commands.rb:50:in `tap'
/app/vendor/bundle/ruby/1.9.1/gems/railties-3.2.12/lib/rails/commands.rb:50:in `<top (required)>'
script/rails:6:in `require'
script/rails:6:in `<main>'
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1 回答 1

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以下链接可能是一个起点：

https://devcenter.heroku.com/articles/postgres-logs-errors#pgerror-ssl-syscall-error-eof-detected

特别是以下摘录：

这些错误表明客户端违反了有线协议。发生这种情况的原因有两个：

  • Postgres 连接在多个进程或线程之间共享。典型的违规者是 Resque 工人或独角兽。请务必在 fork 或 thread 初始化后正确建立 PG 连接以解决此问题。

  • 突然的客户端（应用程序端）断开连接。发生这种情况的原因有很多，从您的应用程序崩溃到暂时的网络可用性。当您的应用程序尝试再次对 postgres 发出查询时，连接就消失了，导致崩溃。当 Heroku 检测到崩溃时，我们迁移杀死该测功机并启动一个新的测功机，从而重新建立连接。

我看到了类似的问题，虽然上述内容很有帮助，但我希望找到一种方法来实际解决问题（如果您无法阻止客户端崩溃服务器，这似乎不是最佳选择）。我已经向 Heroku 提交了一张票，所以如果我发现任何进一步的信息，我会建议...

更新：这是另一个可能相关的链接：https ://github.com/rails/rails/issues/9421 。

于 2013-03-20T01:45:43.073 回答