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Re: [epf-dev] MySQL errors in EPFWiki
Hi Matthew,
This is the second time this lost connection issue is reported on this list, see http://dev.eclipse.org/mhonarc/lists/epf-dev/msg03701.html. 
I am going to check the logs of http://epf.eclipse.org to see if I can find out more. I will report back my findings.
Best Regards,
Onno
 


 
On Wed, May 18, 2011 at 12:36 PM, Matthew Austin <Matthew.austin@xxxxxxxxxx> wrote:

Hello,

We're having some seemingly random but persistent errors on our wiki, and wonder if this has been experienced by anyone else, and maybe if there's a fix.

Our database is being hosted on a MySQL server, and we are using LDAP rather than basic authentication.

We often get errors that look like the following:

Mysql::Error: Lost connection to MySQL server during query: SHOW FIELDS FROM `pages`

These often arise when clicking on the Home tab, or clicking the browser's back button to get back to the Home tab. They are sometimes exhibiting themselves as 500 Internal Server Errors. They don't always pertain to the same database field, and they don't appear all the time, just sporadically.

I've attached the last number of lines from the log file to show a typical error, and the backtrace from the auto-generated email is below.

Is this purely a database issue? Any help or advice is appreciated!

Matt Austin

<<500error.txt>>

Error report from Wed May 18 10:07:56 +0000 2011
Message Mysql::Error: Lost connection to MySQL server during query: SHOW FIELDS FROM `pages`   
Location        http://10.35.1.105:3005/portal/home    
Action  home   
Controller      portal 
Query          
Method  GET    
SSL     false  
Agent   Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2.13) Gecko/20101203 Firefox/3.6.13     
Backtrace
/apps/epfwiki/lib/ruby/gems/1.8/gems/activerecord-2.0.2/lib/active_record/connection_adapters/abstract_adapter.rb:150:in `log'

/apps/epfwiki/lib/ruby/gems/1.8/gems/activerecord-2.0.2/lib/active_record/connection_adapters/mysql_adapter.rb:281:in `execute'

/apps/epfwiki/lib/ruby/gems/1.8/gems/activerecord-2.0.2/lib/active_record/connection_adapters/mysql_adapter.rb:411:in `columns'

/apps/epfwiki/lib/ruby/gems/1.8/gems/activerecord-2.0.2/lib/active_record/base.rb:1080:in `columns'
/apps/epfwiki/lib/ruby/gems/1.8/gems/activerecord-2.0.2/lib/active_record/base.rb:1088:in `columns_hash'
/apps/epfwiki/lib/ruby/gems/1.8/gems/activerecord-2.0.2/lib/active_record/attribute_methods.rb:63:in `define_attribute_methods'

/apps/epfwiki/lib/ruby/gems/1.8/gems/activerecord-2.0.2/lib/active_record/attribute_methods.rb:187:in `method_missing'
/app/models/wiki_page.rb:153:in `current_version'
/app/models/site.rb:82:in `templates'
/apps/epfwiki/lib/ruby/gems/1.8/gems/activerecord-2.0.2/lib/active_record/associations/association_proxy.rb:125:in `each'

/apps/epfwiki/lib/ruby/gems/1.8/gems/activerecord-2.0.2/lib/active_record/associations/association_proxy.rb:125:in `send'

/apps/epfwiki/lib/ruby/gems/1.8/gems/activerecord-2.0.2/lib/active_record/associations/association_proxy.rb:125:in `method_missing'

/apps/epfwiki/lib/ruby/gems/1.8/gems/activerecord-2.0.2/lib/active_record/associations/association_collection.rb:162:in `method_missing'

/app/models/site.rb:81:in `templates'
/apps/epfwiki/lib/ruby/gems/1.8/gems/activesupport-2.0.2/lib/active_support/core_ext/object/misc.rb:28:in `returning'
/app/models/site.rb:80:in `templates'
/app/controllers/portal_controller.rb:33:in `home'
/apps/epfwiki/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/base.rb:1158:in `send'
/apps/epfwiki/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/base.rb:1158:in `perform_action_without_filters'

/apps/epfwiki/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/filters.rb:697:in `call_filters'
/apps/epfwiki/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/filters.rb:689:in `perform_action_without_benchmark'

/apps/epfwiki/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/benchmarking.rb:68:in `perform_action_without_rescue'

/apps/epfwiki/lib/ruby/1.8/benchmark.rb:293:in `measure'
/apps/epfwiki/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/benchmarking.rb:68:in `perform_action_without_rescue'

/apps/epfwiki/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/rescue.rb:199:in `perform_action_without_caching'

/apps/epfwiki/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/caching.rb:678:in `perform_action'
/apps/epfwiki/lib/ruby/gems/1.8/gems/activerecord-2.0.2/lib/active_record/connection_adapters/abstract/query_cache.rb:33:in `cache'

/apps/epfwiki/lib/ruby/gems/1.8/gems/activerecord-2.0.2/lib/active_record/query_cache.rb:8:in `cache'
/apps/epfwiki/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/caching.rb:677:in `perform_action'
/apps/epfwiki/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/base.rb:524:in `send'
/apps/epfwiki/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/base.rb:524:in `process_without_filters'
/apps/epfwiki/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/filters.rb:685:in `process_without_session_management_support'

/apps/epfwiki/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/session_management.rb:123:in `process'
/apps/epfwiki/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/base.rb:388:in `process'
/apps/epfwiki/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/dispatcher.rb:171:in `handle_request'
/apps/epfwiki/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/dispatcher.rb:115:in `dispatch'
/apps/epfwiki/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/dispatcher.rb:126:in `dispatch_cgi'
/apps/epfwiki/lib/ruby/gems/1.8/gems/actionpack-2.0.2/lib/action_controller/dispatcher.rb:9:in `dispatch'
/apps/epfwiki/lib/ruby/gems/1.8/gems/rails-2.0.2/lib/webrick_server.rb:112:in `handle_dispatch'
/apps/epfwiki/lib/ruby/gems/1.8/gems/rails-2.0.2/lib/webrick_server.rb:78:in `service'
/apps/epfwiki/lib/ruby/1.8/webrick/httpserver.rb:104:in `service'
/apps/epfwiki/lib/ruby/1.8/webrick/httpserver.rb:65:in `run'
/apps/epfwiki/lib/ruby/1.8/webrick/server.rb:173:in `start_thread'
/apps/epfwiki/lib/ruby/1.8/webrick/server.rb:162:in `start'
/apps/epfwiki/lib/ruby/1.8/webrick/server.rb:162:in `start_thread'
/apps/epfwiki/lib/ruby/1.8/webrick/server.rb:95:in `start'
/apps/epfwiki/lib/ruby/1.8/webrick/server.rb:92:in `each'
/apps/epfwiki/lib/ruby/1.8/webrick/server.rb:92:in `start'
/apps/epfwiki/lib/ruby/1.8/webrick/server.rb:37:in `start'
/apps/epfwiki/lib/ruby/1.8/webrick/server.rb:82:in `start'
/apps/epfwiki/lib/ruby/gems/1.8/gems/rails-2.0.2/lib/webrick_server.rb:62:in `dispatch'
/apps/epfwiki/lib/ruby/gems/1.8/gems/rails-2.0.2/lib/commands/servers/webrick.rb:66
/apps/epfwiki/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require'
/apps/epfwiki/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `require'
/apps/epfwiki/lib/ruby/gems/1.8/gems/activesupport-2.0.2/lib/active_support/dependencies.rb:496:in `require'
/apps/epfwiki/lib/ruby/gems/1.8/gems/activesupport-2.0.2/lib/active_support/dependencies.rb:342:in `new_constants_in'
/apps/epfwiki/lib/ruby/gems/1.8/gems/activesupport-2.0.2/lib/active_support/dependencies.rb:496:in `require'
/apps/epfwiki/lib/ruby/gems/1.8/gems/rails-2.0.2/lib/commands/server.rb:39
/apps/epfwiki/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require'
/apps/epfwiki/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `require'
script/server:3

______________________________________________
Matthew Austin - Consultant
t +44 (0)20 7812 4034 | m +44 (0)77 4553 5665
a Detica | 2 Arundel Street | London | WC2R 3AZ | UK
______________________________________________
www.detica.com 

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