The last couple of months we've seen sporadic connection issues from our Heroku app to MongoHQ. It's usually about 10-20 a day, and a typical error looks like this (from Exceptional):
VersionsController# (Timeout::Error) "execution expired" /app/065b4f1b-fbaf-40c9-a050-993b7f0765e6/home/.bundle/gems/ruby/1.9.1/gems/mongo-1.2.4/lib/mongo/connection.rb:797:in `read' /app/065b4f1b-fbaf-40c9-a050-993b7f0765e6/home/.bundle/gems/ruby/1.9.1/gems/mongo-1.2.4/lib/mongo/connection.rb:797:in `receive_message_on_socket' /app/065b4f1b-fbaf-40c9-a050-993b7f0765e6/home/.bundle/gems/ruby/1.9.1/gems/mongo-1.2.4/lib/mongo/connection.rb:667:in `receive_header' /app/065b4f1b-fbaf-40c9-a050-993b7f0765e6/home/.bundle/gems/ruby/1.9.1/gems/mongo-1.2.4/lib/mongo/connection.rb:657:in `receive' /app/065b4f1b-fbaf-40c9-a050-993b7f0765e6/home/.bundle/gems/ruby/1.9.1/gems/mongo-1.2.4/lib/mongo/connection.rb:435:in `block in receive_message' <internal:prelude>:10:in `synchronize' /app/065b4f1b-fbaf-40c9-a050-993b7f0765e6/home/.bundle/gems/ruby/1.9.1/gems/mongo-1.2.4/lib/mongo/connection.rb:433:in `receive_message' /app/065b4f1b-fbaf-40c9-a050-993b7f0765e6/home/.bundle/gems/ruby/1.9.1/gems/mongo-1.2.4/lib/mongo/cursor.rb:384:in `block in send_initial_query' /app/065b4f1b-fbaf-40c9-a050-993b7f0765e6/home/.bundle/gems/ruby/1.9.1/gems/mongo-1.2.4/lib/mongo/connection.rb:543:in `instrument' /app/065b4f1b-fbaf-40c9-a050-993b7f0765e6/home/.bundle/gems/ruby/1.9.1/gems/mongo-1.2.4/lib/mongo/cursor.rb:383:in `send_initial_query' /app/065b4f1b-fbaf-40c9-a050-993b7f0765e6/home/.bundle/gems/ruby/1.9.1/gems/mongo-1.2.4/lib/mongo/cursor.rb:348:in `refresh' /app/065b4f1b-fbaf-40c9-a050-993b7f0765e6/home/.bundle/gems/ruby/1.9.1/gems/mongo-1.2.4/lib/mongo/cursor.rb:72:in `next_document' /app/065b4f1b-fbaf-40c9-a050-993b7f0765e6/home/.bundle/gems/ruby/1.9.1/gems/mongo-1.2.4/lib/mongo/db.rb:492:in `command' /app/065b4f1b-fbaf-40c9-a050-993b7f0765e6/home/.bundle/gems/ruby/1.9.1/gems/mongo-1.2.4/lib/mongo/connection.rb:636:in `check_is_master' /app/065b4f1b-fbaf-40c9-a050-993b7f0765e6/home/.bundle/gems/ruby/1.9.1/gems/mongo-1.2.4/lib/mongo/connection.rb:455:in `connect' /app/065b4f1b-fbaf-40c9-a050-993b7f0765e6/home/.bundle/gems/ruby/1.9.1/gems/mongo-1.2.4/lib/mongo/connection.rb:512:in `checkout_reader' /app/065b4f1b-fbaf-40c9-a050-993b7f0765e6/home/.bundle/gems/ruby/1.9.1/gems/mongo-1.2.4/lib/mongo/connection.rb:428:in `receive_message' /app/065b4f1b-fbaf-40c9-a050-993b7f0765e6/home/.bundle/gems/ruby/1.9.1/gems/mongo-1.2.4/lib/mongo/cursor.rb:384:in `block in send_initial_query' /app/065b4f1b-fbaf-40c9-a050-993b7f0765e6/home/.bundle/gems/ruby/1.9.1/gems/mongo-1.2.4/lib/mongo/connection.rb:543:in `instrument' /app/065b4f1b-fbaf-40c9-a050-993b7f0765e6/home/.bundle/gems/ruby/1.9.1/gems/mongo-1.2.4/lib/mongo/cursor.rb:383:in `send_initial_query' /app/065b4f1b-fbaf-40c9-a050-993b7f0765e6/home/.bundle/gems/ruby/1.9.1/gems/mongo-1.2.4/lib/mongo/cursor.rb:348:in `refresh' /app/065b4f1b-fbaf-40c9-a050-993b7f0765e6/home/.bundle/gems/ruby/1.9.1/gems/mongo-1.2.4/lib/mongo/cursor.rb:72:in `next_document' /app/065b4f1b-fbaf-40c9-a050-993b7f0765e6/home/.bundle/gems/ruby/1.9.1/gems/mongo-1.2.4/lib/mongo/collection.rb:229:in `find_one' I've been in contact with MongoHQ support regarding this, but they haven't found a solution yet. There's a thread over at their support forums where we try to find the cause for this. If you've experienced the same thing, please join in with your experiences and possible workarounds: http://support.mongohq.com/discussions/problems/233-connection-failure-issues -martin -- You received this message because you are subscribed to the Google Groups "Heroku" group. To post to this group, send email to heroku@googlegroups.com. To unsubscribe from this group, send email to heroku+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/heroku?hl=en.
