CODEWITHSUNDEEP
rubyherokurackthin
Colonel Panic
Colonel Panic

Reputation: 137524

What does Heroku mean by app[web.1]?

What does Heroku mean by app[web.1] and by <main>:48?

I have a crash that happens only on Heroku and not on my computer, I'm trying to identify the precise line causing the crash. These are the logs

2012-10-08T21:31:49+00:00 app[web.1]: <main>:48:in `method_missing': wrong number of arguments (1 for 2) (ArgumentError)
2012-10-08T21:31:49+00:00 app[web.1]:   from /app/vendor/bundle/ruby/1.9.1/gems/rack-1.4.1/lib/rack/server.rb:265:in `start'
2012-10-08T21:31:49+00:00 app[web.1]:   from /app/vendor/bundle/ruby/1.9.1/gems/rack-1.4.1/lib/rack/server.rb:137:in `start'
2012-10-08T21:31:49+00:00 app[web.1]:   from /app/vendor/bundle/ruby/1.9.1/gems/thin-1.5.0/lib/thin/server.rb:104:in `block in initialize'
2012-10-08T21:31:49+00:00 app[web.1]:   from /app/vendor/bundle/ruby/1.9.1/gems/rack-1.4.1/bin/rackup:4:in `<top (required)>'
2012-10-08T21:31:49+00:00 app[web.1]:   from /app/vendor/bundle/ruby/1.9.1/bin/rackup:19:in `load'
2012-10-08T21:31:49+00:00 app[web.1]:   from /app/vendor/bundle/ruby/1.9.1/gems/thin-1.5.0/lib/thin/server.rb:104:in `==='
2012-10-08T21:31:49+00:00 app[web.1]:   from /app/vendor/bundle/ruby/1.9.1/bin/rackup:19:in `<main>'
2012-10-08T21:31:49+00:00 app[web.1]:   from /app/vendor/bundle/ruby/1.9.1/gems/thin-1.5.0/lib/thin/server.rb:102:in `initialize'
2012-10-08T21:31:49+00:00 app[web.1]:   from /app/vendor/bundle/ruby/1.9.1/gems/rack-1.4.1/lib/rack/handler/thin.rb:9:in `new'
2012-10-08T21:31:49+00:00 app[web.1]:   from /app/vendor/bundle/ruby/1.9.1/gems/rack-1.4.1/lib/rack/handler/thin.rb:9:in `run'
2012-10-08T21:31:49+00:00 app[web.1]:   from /app/vendor/bundle/ruby/1.9.1/gems/thin-1.5.0/lib/thin/server.rb:102:in `each'
2012-10-08T21:31:50+00:00 heroku[web.1]: Process exited with status 1
2012-10-08T21:31:50+00:00 heroku[web.1]: State changed from starting to crashed
2012-10-08T21:31:52+00:00 heroku[router]: Error H10 (App crashed) -> GET placeboxy.herokuapp.com/ dyno= queue= wait= service= status=503 bytes=

Is the crash in my code or in the web server Thin or elsewhere?

Edit I changed the Procfile to run the server unicorn on Heroku and the crashed stopped. No error with puma either. Any ideas? Is Thin to fault?

Upvotes: 0

Views: 821

Answers (1)

rewritten
rewritten

Reputation: 16435

The app[web.1] is a tag that heroku adds to your log to mark which process is emitting the log, as all the logs are collected in a central place, you can still filter a single process and parse the process log.

The <main>:48: part means the file/line where the execution has been stopped because of the exception. In this case (<main>) it's the main script that's being run. You won't find your error there, probably. You have to search in the backtrace for the part of your code that is failing, look for something that's not an external library, nor core ruby. The backtrace you show is of no help, normally the error is much lower in the stack trace.

Upvotes: 3

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