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
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