Description of problem:
Can't thread dump rails4 quickstart of ruby-2.0 after access the app url,showing "Unable to detect application PID. Check the application's availability by accessing http://<app>-<domain>.dev.rhcloud.com."
Check the process in app, there is no Passenger RackApp process existed
It works for normal ruby-2.0 app.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1.Create a rails application
rhc app create railsapp ruby-2.0 mysql-5.5
2.Add this upstream Rails4 quickstart repository
git remote add upstream -m master git://github.com/openshift/rails4-example.git
git pull -s recursive -X theirs upstream master
3.Access this app
4.Threaddump this app
# rhc threaddump rails4
Unable to detect application PID. Check the application's availability by accessing http://rails4-abcd.dev.rhcloud.com
Could threaddump this app
AFAIK, thread dump is not supported for ruby > 1.8 (including rails3/ruby1.9). I will make jhadvig double check this as he was working on it.