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Re: [epf-dev] MySQL errors in EPFWiki
Hi Onno,
 
Thanks for your reply. After a little more testing and rooting around, I discovered that these errors no longer presented themselves after turning config.cache_classes to true in config/environments/*.rb.
 
Do you have any information on exactly what difference this variable makes when it is turned on, and perhaps the other cacheing variable in that file? I understand it's to do with whether or not you need to restart the web server for changes to take effect, but I have to admit to being rather stuck on the details.
 
Thanks again
Matt
 

______________________________________________
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

 

From: epf-dev-bounces@xxxxxxxxxxx [mailto:epf-dev-bounces@xxxxxxxxxxx] On Behalf Of Onno van der Straaten
Sent: 18 May 2011 13:01
To: Eclipse Process Framework Project Developers List
Subject: 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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This message should be regarded as confidential. If you have received this email in error please notify the sender and destroy it immediately.
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Detica Limited is registered in England under No: 1337451.

Registered offices: Surrey Research Park, Guildford, Surrey, GU2 7YP, England.

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Please consider the environment before printing this email.

This message should be regarded as confidential. If you have received this email in error please notify the sender and destroy it immediately.
Statements of intent shall only become binding when confirmed in hard copy by an authorised signatory.  The contents of this email may relate to dealings with other companies within the Detica Limited group of companies.

Detica Limited is registered in England under No: 1337451.

Registered offices: Surrey Research Park, Guildford, Surrey, GU2 7YP, England.

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