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I'm making an expensive call to my Heroku Rails server. After 13-15 seconds the console in my browser reports a Service Unavailable 503 error. However when I check my heroku logs, it reports:
Completed 200 OK in 45592ms (Views: 220.3ms | ActiveRecord: 33457.5ms)
Other times the heroku logs report a memory exceeded quota. Here is an example of that below.
2015-06-11T15:17:20.238285+00:00 app[web.1]: Completed 200 OK in 81881ms (Views: 201.6ms | ActiveRecord: 18021.2ms)
2015-06-11T15:17:33.482930+00:00 heroku[web.1]: Process running mem=841M(164.4%)
2015-06-11T15:17:33.482930+00:00 heroku[web.1]: Error R14 (Memory quota exceeded)
2015-06-11T15:17:53.147570+00:00 heroku[web.1]: Process running mem=841M(164.4%)
2015-06-11T15:17:53.147679+00:00 heroku[web.1]: Error R14 (Memory quota exceeded)
2015-06-11T15:17:59.751540+00:00 app[web.1]: E, [2015-06-11T15:17:59.695813 #3] ERROR -- : worker=2 PID:13 timeout (121s > 120s), killing
2015-06-11T15:17:59.916750+00:00 app[web.1]: E, [2015-06-11T15:17:59.906435 #3] ERROR -- : reaped #<Process::Status: pid 13 SIGKILL (signal 9)> worker=2
2015-06-11T15:18:02.487428+00:00 app[web.1]: I, [2015-06-11T15:18:02.427293 #16] INFO -- : worker=2 ready
Why is it reporting a Completed 200 when the console is reporting a 503?
694
Whenever your app experiences an error, Heroku will return a standard error page with the HTTP status code 503. To help you debug the underlying error, however, the platform will also add custom error information to your logs.
You can view logs with the Heroku CLI, the dashboard, your logging add-on, or in your log drain. You can't view logs for apps in Shield spaces with Private Space Logging enabled. Retrieve logs from your log drain instead.
there are 2 different things here:
In this case the load balancer see that the request is taking too long and sends you the 503. In the back the service processes the request and returns completes with a 200.
See:
https://devcenter.heroku.com/articles/limits
https://devcenter.heroku.com/articles/request-timeout
200
Heroku does not gives us much information for error-code = H10. Simple put, something is going wrong with your application code / configuration. To see what's going wrong, run heroku run rails console and you will be able to see error details which will be help you in resolving the error. No need to use logs. heroku run rails console is a big help
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