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@taras-yorku
Forked from defunkt/connection_fix.rb
Created August 26, 2011 15:55
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MySQL server has gone away fix - Ensure it only affects mysql2 adapter
# If your workers are inactive for a long period of time, they'll lose
# their MySQL connection.
#
# This hack ensures we re-connect whenever a connection is
# lost. Because, really. why not?
#
# Stick this in RAILS_ROOT/config/initializers/connection_fix.rb (or somewhere similar)
#
# From:
# http://coderrr.wordpress.com/2009/01/08/activerecord-threading-issues-and-resolutions/
adapter = ActiveRecord::Base.configurations[Rails.env]['adapter']
if adapter == "mysql2"
module ActiveRecord::ConnectionAdapters
class Mysql2Adapter
alias_method :execute_without_retry, :execute
def execute(*args)
execute_without_retry(*args)
rescue ActiveRecord::StatementInvalid => e
if e.message =~ /server has gone away/i
warn "Server timed out, retrying"
reconnect!
retry
else
raise e
end
end
end
end
end
@taras-yorku
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This is a work around to make patch the code if the adapter is mysql2. Without the if statement this patch will fail if you use other database adapters in different environments.

Here's my article with full explanation
http://thirddirective.com/posts/19-mysql-server-has-gone-away-fix-only-affecting-mysql

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