App not responding after flask application Apache deployment(mod_wsgi) - apache

Question

I'm trying to deploy my flask application on Apache web server using mod_wsgi.
After the deployment, when i go to the 'healthCheck' URL i configured to return a simple text message, the app is not responding and it's timing out.
This is my wsgi file:
<VirtualHost *:5000>
ServerName <My ip address here>
ServerAdmin admin#mywebsite.com
WSGIScriptAlias / /var/www/ReleaseServices/ReleaseServices.wsgi
<Directory /var/www/ReleaseServices/ReleaseServices/>
Order allow,deny
Allow from all
</Directory>
Alias /static /var/www/ReleaseServices/ReleaseServices/static
<Directory /var/www/ReleaseServices/ReleaseServices/static/>
Order allow,deny
Allow from all
</Directory>
ErrorLog ${APACHE_LOG_DIR}/error.log
LogLevel warn
CustomLog ${APACHE_LOG_DIR}/access.log combined
</VirtualHost>
I don't see any error in the apache logs as well. What could be the issue?
Please ask me if any extra details are required.

Answer 1

So i found the solution after searching a lot.
I was using scikit-learn in my init.py script and the import statement was causing issues and making the app unresponsive. After removing the import, it was working fine.
When i searched for solutions, i found some interesting facts related to the WSGI configuration, one of which i had missed out:
http://blog.rtwilson.com/how-to-fix-flask-wsgi-webapp-hanging-when-importing-a-module-such-as-numpy-or-matplotlib/
In that link, check the comment by Graham Dumpleton:
The specific solution is forcing use of the main interpreter by setting the application group to %{GLOBAL}. It is documented in
http://code.google.com/p/modwsgi/wiki/ApplicationIssues#Python_Simplified_GIL_State_API
Basically you have to add the following line to your .wsgi file:
WSGIApplicationGroup %{GLOBAL}
This will force a specific WSGI application to be run within the very first Python sub interpreter created when Python is initialised and hence solves the problem!