Errno::EPIPE (Broken pipe)

[TeuF]

Hi,

I have some problem with ruby-mysql 2.9.3
After restarting the server everything works fine for 5 minutes, then I got the same error again.

Errno::EPIPE (Broken pipe):
  ruby-mysql (2.9.3) lib/mysql/protocol.rb:617:in `flush'
  ruby-mysql (2.9.3) lib/mysql/protocol.rb:617:in `write'
  /usr/lib/ruby/1.8/timeout.rb:53:in `timeout'
  ruby-mysql (2.9.3) lib/mysql/protocol.rb:616:in `write'
  ruby-mysql (2.9.3) lib/mysql/protocol.rb:640:in `simple_command'
  ruby-mysql (2.9.3) lib/mysql/protocol.rb:545:in `synchronize'
  ruby-mysql (2.9.3) lib/mysql/protocol.rb:638:in `simple_command'
  ruby-mysql (2.9.3) lib/mysql/protocol.rb:413:in `statistics_command'
  ruby-mysql (2.9.3) lib/mysql.rb:502:in `stat'
  activerecord (3.0.1) lib/active_record/connection_adapters/mysql_adapter.rb:238:in `active?'
  activerecord (3.0.1) lib/active_record/connection_adapters/abstract_adapter.rb:148:in `verify!'
  activerecord (3.0.1) lib/active_record/connection_adapters/abstract/connection_pool.rb:250:in `checkout_and_verify'
  activesupport (3.0.1) lib/active_support/callbacks.rb:413:in `_run_checkout_callbacks'
  activesupport (3.0.1) lib/active_support/callbacks.rb:93:in `send'
  activesupport (3.0.1) lib/active_support/callbacks.rb:93:in `run_callbacks'
  activerecord (3.0.1) lib/active_record/connection_adapters/abstract/connection_pool.rb:249:in `checkout_and_verify'
  activerecord (3.0.1) lib/active_record/connection_adapters/abstract/connection_pool.rb:245:in `checkout_existing_connection'
  activerecord (3.0.1) lib/active_record/connection_adapters/abstract/connection_pool.rb:192:in `checkout'
  activerecord (3.0.1) lib/active_record/connection_adapters/abstract/connection_pool.rb:190:in `loop'
  activerecord (3.0.1) lib/active_record/connection_adapters/abstract/connection_pool.rb:190:in `checkout'
  /usr/lib/ruby/1.8/monitor.rb:242:in `synchronize'
  activerecord (3.0.1) lib/active_record/connection_adapters/abstract/connection_pool.rb:189:in `checkout'
  activerecord (3.0.1) lib/active_record/connection_adapters/abstract/connection_pool.rb:96:in `connection'
  activerecord (3.0.1) lib/active_record/connection_adapters/abstract/connection_pool.rb:318:in `retrieve_connection'
  activerecord (3.0.1) lib/active_record/connection_adapters/abstract/connection_specification.rb:97:in `retrieve_connection'
  activerecord (3.0.1) lib/active_record/connection_adapters/abstract/connection_specification.rb:89:in `connection'
  activerecord (3.0.1) lib/active_record/query_cache.rb:12:in `cache'
  activerecord (3.0.1) lib/active_record/query_cache.rb:31:in `call'
  activerecord (3.0.1) lib/active_record/connection_adapters/abstract/connection_pool.rb:355:in `call'
  actionpack (3.0.1) lib/action_dispatch/middleware/callbacks.rb:46:in `call'
  activesupport (3.0.1) lib/active_support/callbacks.rb:415:in `_run_call_callbacks'
  actionpack (3.0.1) lib/action_dispatch/middleware/callbacks.rb:44:in `call'
  rack (1.2.1) lib/rack/sendfile.rb:107:in `call'
  actionpack (3.0.1) lib/action_dispatch/middleware/remote_ip.rb:48:in `call'
  actionpack (3.0.1) lib/action_dispatch/middleware/show_exceptions.rb:46:in `call'
  railties (3.0.1) lib/rails/rack/logger.rb:13:in `call'
  rack (1.2.1) lib/rack/runtime.rb:17:in `call'
  rack (1.2.1) lib/rack/lock.rb:11:in `call'
  rack (1.2.1) lib/rack/lock.rb:11:in `synchronize'
  rack (1.2.1) lib/rack/lock.rb:11:in `call'
  actionpack (3.0.1) lib/action_dispatch/middleware/static.rb:30:in `call'
  railties (3.0.1) lib/rails/application.rb:168:in `call'
  railties (3.0.1) lib/rails/application.rb:77:in `send'
  railties (3.0.1) lib/rails/application.rb:77:in `method_missing'
  thin (1.2.7) lib/thin/connection.rb:76:in `pre_process'
  thin (1.2.7) lib/thin/connection.rb:74:in `catch'
  thin (1.2.7) lib/thin/connection.rb:74:in `pre_process'
  thin (1.2.7) lib/thin/connection.rb:57:in `process'
  thin (1.2.7) lib/thin/connection.rb:42:in `receive_data'
  eventmachine (0.12.10) lib/eventmachine.rb:256:in `run_machine'
  eventmachine (0.12.10) lib/eventmachine.rb:256:in `run'
  thin (1.2.7) lib/thin/backends/base.rb:57:in `start'
  thin (1.2.7) lib/thin/server.rb:156:in `start'
  thin (1.2.7) lib/thin/controllers/controller.rb:80:in `start'
  thin (1.2.7) lib/thin/runner.rb:177:in `send'
  thin (1.2.7) lib/thin/runner.rb:177:in `run_command'
  thin (1.2.7) lib/thin/runner.rb:143:in `run!'
  thin (1.2.7) bin/thin:6
  /usr/bin/thin:19:in `load'
  /usr/bin/thin:19

My bundle

$ bundle list
Gems included by the bundle:
  * RedCloth (4.2.3)
  * aasm (2.2.0 5d71530)
  * abstract (1.0.0)
  * actionmailer (3.0.1)
  * actionpack (3.0.1)
  * activemodel (3.0.1)
  * activerecord (3.0.1)
  * activeresource (3.0.1)
  * activesupport (3.0.1)
  * acts-as-taggable-on (2.0.6)
  * acts_as_commentable (3.0.0 247df98)
  * ajaxful_rating (3.0.0.beta3 81b563e)
  * arel (1.0.1)
  * authlogic (2.1.3 a087ad0)
  * authlogic-oauth (1.0.8 5416269)
  * babosa (0.2.0)
  * builder (2.1.2)
  * bundler (1.0.0)
  * cancan (1.4.0)
  * daemons (1.0.10)
  * date_validator (0.5.9)
  * delayed_job (2.1.0.pre b52361d)
  * erubis (2.6.6)
  * exception_notification (1.0.0 192a49a)
  * friendly_id (3.1.7)
  * gem_plugin (0.2.3)
  * geokit (1.5.0)
  * i18n (0.4.1)
  * json (1.4.6)
  * mail (2.2.7)
  * mime-types (1.16)
  * mongrel (1.2.0.pre2)
  * newrelic_rpm (2.13.2)
  * nokogiri (1.4.3.1)
  * oauth (0.4.3)
  * paperclip (2.3.4 ef7233d)
  * polyglot (0.3.1)
  * rack (1.2.1)
  * rack-mount (0.6.13)
  * rack-test (0.5.6)
  * rails (3.0.1)
  * rails3-jquery-autocomplete (0.4.0)
  * railties (3.0.1)
  * rake (0.8.7)
  * riddle (1.1.0)
  * ruby-graphviz (0.9.18)
  * ruby-mysql (2.9.3)
  * thinking-sphinx (2.0.0.rc2 108a1fc)
  * thor (0.14.3)
  * treetop (1.4.8)
  * twitter_oauth (0.4.3)
  * tzinfo (0.3.23)
  * will_paginate (3.0.pre3 b1a5bee)

What's wrong ? :S

Thx

[cimm]

Same problem here... as far as I can tell it has something to do with the database connection being closed when not accessed for x minutes. Didn't find a decent fix yet.

Same here - any hints greatly appreciated!
I should mention that i use Rails 3.0.1, ruby-mysql 2.9.3 and passenger-3.0.0. It seems that the problem only occurs with passenger-3.0.0. I switched my production servers back to passenger-2.2.15 and the problem disappeared.

[JangoSteve]

Same problem here, working with Rails 3.0.5, Passenger 3.0.5, and Nginx on Amazon EC2.

[cimm]

For those having problems with the MySQL gem and Rails 3, please have a look at the mysql2 gem at https://github.com/brianmario/mysql2, it's the new default MySQL driver. Head over to Yehuda's post for some more information: http://yehudakatz.com/2010/08/14/threads-in-ruby-enough-already/