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Type:
Task
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Resolution: Done
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Priority:
Major - P3
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None
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Affects Version/s: 3.6.1
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Component/s: None
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Environment:Ubuntu 16.04
apache2 2.4.18-2ubuntu3.5
libapache2-mod-wsgi 4.3.0-1.1build1
Django==1.5
Hi,
Recently, I've tried to upgrade from PyMongo 2.8 - PyMongo 3.6 in a running django web app. After performing changes mentioned in api.mongodb.com/python/current/migrate-to-pymongo3.html. The Project started to run on the Django built-in HTTP server. However, as soon as the project is deployed on Apache, we started to observe the following error:
[Wed Mar 07 04:12:34.814175 2018] [wsgi:error] [pid 19734] Internal Server Error: /api/admin/v1/server-status/ [Wed Mar 07 04:12:34.814326 2018] [wsgi:error] [pid 19734] Traceback (most recent call last): [Wed Mar 07 04:12:34.814356 2018] [wsgi:error] [pid 19734] File "/home/madmin/venv/api-pymongo3/local/lib/python2.7/site-packages/django/core/handlers/base.py", line 103, in get_response [Wed Mar 07 04:12:34.814381 2018] [wsgi:error] [pid 19734] resolver_match = resolver.resolve(request.path_info) [Wed Mar 07 04:12:34.814396 2018] [wsgi:error] [pid 19734] File "/home/madmin/venv/api-pymongo3/local/lib/python2.7/site-packages/django/core/urlresolvers.py", line 319, in resolve [Wed Mar 07 04:12:34.814435 2018] [wsgi:error] [pid 19734] for pattern in self.url_patterns: [Wed Mar 07 04:12:34.814454 2018] [wsgi:error] [pid 19734] File "/home/madmin/venv/api-pymongo3/local/lib/python2.7/site-packages/django/core/urlresolvers.py", line 347, in url_patterns [Wed Mar 07 04:12:34.814473 2018] [wsgi:error] [pid 19734] patterns = getattr(self.urlconf_module, "urlpatterns", self.urlconf_module) [Wed Mar 07 04:12:34.814480 2018] [wsgi:error] [pid 19734] File "/home/madmin/venv/api-pymongo3/local/lib/python2.7/site-packages/django/core/urlresolvers.py", line 342, in urlconf_module [Wed Mar 07 04:12:34.814539 2018] [wsgi:error] [pid 19734] self._urlconf_module = import_module(self.urlconf_name) [Wed Mar 07 04:12:34.814559 2018] [wsgi:error] [pid 19734] File "/home/madmin/venv/api-pymongo3/local/lib/python2.7/site-packages/django/utils/importlib.py", line 35, in import_module [Wed Mar 07 04:12:34.814577 2018] [wsgi:error] [pid 19734] __import__(name) [Wed Mar 07 04:12:34.814597 2018] [wsgi:error] [pid 19734] File "/home/madmin/poc_pymongo/poc_pymongo/urls.py", line 3, in <module> [Wed Mar 07 04:12:34.814618 2018] [wsgi:error] [pid 19734] from api import ServerStatusResource [Wed Mar 07 04:12:34.814644 2018] [wsgi:error] [pid 19734] File "/home/madmin/poc_pymongo/poc_pymongo/api.py", line 13, in <module> [Wed Mar 07 04:12:34.814703 2018] [wsgi:error] [pid 19734] print list(conn['poc_pymongo'].test_collection.find()) [Wed Mar 07 04:12:34.814729 2018] [wsgi:error] [pid 19734] File "/home/madmin/venv/api-pymongo3/local/lib/python2.7/site-packages/pymongo/cursor.py", line 1169, in next [Wed Mar 07 04:12:34.814747 2018] [wsgi:error] [pid 19734] if len(self.__data) or self._refresh(): [Wed Mar 07 04:12:34.814769 2018] [wsgi:error] [pid 19734] File "/home/madmin/venv/api-pymongo3/local/lib/python2.7/site-packages/pymongo/cursor.py", line 1068, in _refresh [Wed Mar 07 04:12:34.814808 2018] [wsgi:error] [pid 19734] self.__session = self.__collection.database.client._ensure_session() [Wed Mar 07 04:12:34.814872 2018] [wsgi:error] [pid 19734] File "/home/madmin/venv/api-pymongo3/local/lib/python2.7/site-packages/pymongo/mongo_client.py", line 1432, in _ensure_session [Wed Mar 07 04:12:34.814889 2018] [wsgi:error] [pid 19734] return self.start_session(causal_consistency=False) [Wed Mar 07 04:12:34.814912 2018] [wsgi:error] [pid 19734] File "/home/madmin/venv/api-pymongo3/local/lib/python2.7/site-packages/pymongo/mongo_client.py", line 1410, in start_session [Wed Mar 07 04:12:34.815013 2018] [wsgi:error] [pid 19734] server_session = self._get_server_session() [Wed Mar 07 04:12:34.815036 2018] [wsgi:error] [pid 19734] File "/home/madmin/venv/api-pymongo3/local/lib/python2.7/site-packages/pymongo/mongo_client.py", line 1418, in _get_server_session [Wed Mar 07 04:12:34.815044 2018] [wsgi:error] [pid 19734] return self._topology.get_server_session() [Wed Mar 07 04:12:34.815170 2018] [wsgi:error] [pid 19734] File "/home/madmin/venv/api-pymongo3/local/lib/python2.7/site-packages/pymongo/topology.py", line 427, in get_server_session [Wed Mar 07 04:12:34.815188 2018] [wsgi:error] [pid 19734] None) [Wed Mar 07 04:12:34.815209 2018] [wsgi:error] [pid 19734] File "/home/madmin/venv/api-pymongo3/local/lib/python2.7/site-packages/pymongo/topology.py", line 199, in _select_servers_loop [Wed Mar 07 04:12:34.815226 2018] [wsgi:error] [pid 19734] self._error_message(selector)) [Wed Mar 07 04:12:34.815330 2018] [wsgi:error] [pid 19734] ServerSelectionTimeoutError: No servers found yet
- The error is reproducible when mongo connection is opened on the global level.
- Our apache is lazy load i.e. It loads up the app only on the request.
- I've read the discussion on https://jira.mongodb.org/browse/PYTHON-961 and thinks this is the same issue which was getting discussed in last comments.
I've created a simple sample Django project that mimics our use case. https://github.com/ArsalanKhairani/poc_pymongo. Apache config is also there in the repository.