cassandra.cqlengine.CQLEngineException: cassandra.cqlengine.connection.cluster is not configured.

[Vaibhav Jain]

Hi There,

 I am running a python(3.4) flask app on aws beanstalk(amazon linux). When I login to ec2 shell and try to run flask app locally, it runs properly and easily fetches data from remote cassandra. 

My env:

 (venv)[ec2-user@ip-11.1.1.1 ~]$ pip freeze

cassandra-driver==3.6.0
click==6.6
Cython==0.24.1
Flask==0.11
itsdangerous==0.24
Jinja2==2.8
MarkupSafe==0.23
six==1.10.0
Werkzeug==0.11.11
xmltodict==0.10.2 

But while fetching data from cassandra the app run by AWS eb keep throwing following errors in httpd/error_log.  

ERROR in app: Exception on /user/1003 [GET]
Traceback (most recent call last):
File "/opt/python/run/venv/lib/python3.4/site-packages/flask/app.py", line 1988, in wsgi_app
response = self.full_dispatch_request()
File "/opt/python/run/venv/lib/python3.4/site-packages/flask/app.py", line 1641, in full_dispatch_request
rv = self.handle_user_exception(e)
File "/opt/python/run/venv/lib/python3.4/site-packages/flask/app.py", line 1544, in handle_user_exception
reraise(exc_type, exc_value, tb)
File "/opt/python/run/venv/lib/python3.4/site-packages/flask/_compat.py", line 33, in reraise
raise value
File "/opt/python/run/venv/lib/python3.4/site-packages/flask/app.py", line 1639, in full_dispatch_request
rv = self.dispatch_request()
File "/opt/python/run/venv/lib/python3.4/site-packages/flask/app.py", line 1625, in dispatch_request
return self.view_functions[rule.endpoint](**req.view_args)
File "/opt/python/current/app/application.py", line 53, in user_profile
data = get_user_data(id)
File "/opt/python/current/app/application.py", line 163, in get_user_data
if obj:
File "/opt/python/run/venv/lib64/python3.4/site-packages/cassandra/cqlengine/query.py", line 393, in __le
n__
self._execute_query()
File "/opt/python/run/venv/lib64/python3.4/site-packages/cassandra/cqlengine/query.py", line 428, in _exe
cute_query
self._result_generator = (i for i in self._execute(self._select_query()))
File "/opt/python/run/venv/lib64/python3.4/site-packages/cassandra/cqlengine/query.py", line 360, in _exe
cute
result = _execute_statement(self.model, statement, self._consistency, self._timeout)
File "/opt/python/run/venv/lib64/python3.4/site-packages/cassandra/cqlengine/query.py", line 1412, in _ex
ecute_statement
parts = model._routing_key_from_values(key_values, connection.get_cluster().protocol_version)
File "/opt/python/run/venv/lib64/python3.4/site-packages/cassandra/cqlengine/connection.py", line 183, in
 get_cluster
raise CQLEngineException("%s.cluster is not configured. Call one of the setup or default functions firs
t." % __name__)
cassandra.cqlengine.CQLEngineException: cassandra.cqlengine.connection.cluster is not configured. Call one
of the setup or default functions first.

Regards,

Vaibhav 

[Alan Boudreault]

Vaibhav,

How do you run that application? In addition that the application works when you run it manually, you don´t provide any detail how it actually runs when it fails. Some code could also help us to debug. I assume you do run ´connection.setup()´, so maybe that part of the code is not executed when you run the app the other way. 

Alan 

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Alan Boudreault

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[Vaibhav Jain]

Hi Alan,

Thanks for your reply.

My Bad. I was setting the connection with in python __main__ function.  AWS configuration for Elastic Beanstalk configures the WSGI environment (it’s Apache + WSGI in the backend). When it was being run in the EB environment, the main function was getting called. I moved the connection outside main function it started working. 

Thanks,

Vaibhav   

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Alan Boudreault

Software Engineer (Drivers) | alan.bo...@datastax.com

[Vaibhav Jain]

Corrected typos. 

 I was setting the connection with in python __main__ function.  AWS configuration for Elastic Beanstalk configures the WSGI environment (it’s Apache + WSGI in the backend). When it was being run in the EB environment, the main function was not getting called. I moved the connection code outside main function and it started working

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