Fix for Resque forking might cause stuck workers for the threaded Sidekiq.

config/initializers/connection_fix.rb

-# from http://gist.github.com/238999
-#
-# 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/
-
-if defined?(ActiveRecord::ConnectionAdapters::Mysql2Adapter)
-
-  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