I've come across a similar problem, and I'm pretty curious if you ever
figured out what caused this for you. Any help is appreciated.
Thanks
Bryan
On Sunday, April 6, 2014 at 1:02:20 AM UTC-4, Fraser Graham wrote:
>
> I have been running an Django 1.5.1 app under Apache for some time without
> issue. Today, without any changes to the server I started seeing 500 Errors
> caused by an Exception in DatabaseWrapper relating to threading, I have no
> threading behavior in my code so this confuses me. The error affects all
> routes, although intermittently, roughly every 10th access or so hit this
> problem. It seems to trigger on first contact with the Database (Postgres
> 9.2 running on another machine)
>
> Some tracebacks don't touch any of my own code. I restarted Apache and it
> made no difference, then I stopped Apache completely and started it again,
> now I am no longer seeing the error. However i'd like to understand why
> this happened and prevent it from happening again.
>
> Any suggestions on what may have caused this?
>
> Thanks,
> Fraser Graham
>
> An example traceback from one of the API calls:
>
> Traceback (most recent call last):
>
> File
> "/home/bats/.virtualenvs/bats/lib/python2.7/site-packages/tastypie/resources.py",
>
> line 217, in wrapper
> response = callback(request, *args, **kwargs)
>
> File
> "/home/bats/.virtualenvs/bats/lib/python2.7/site-packages/tastypie/resources.py",
>
> line 468, in dispatch_detail
> return self.dispatch('detail', request, **kwargs)
>
> File
> "/home/bats/.virtualenvs/bats/lib/python2.7/site-packages/tastypie/resources.py",
>
> line 486, in dispatch
> self.is_authenticated(request)
>
> File
> "/home/bats/.virtualenvs/bats/lib/python2.7/site-packages/tastypie/resources.py",
>
> line 569, in is_authenticated
> auth_result = self._meta.authentication.is_authenticated(request)
>
> File
> "/home/bats/.virtualenvs/bats/lib/python2.7/site-packages/tastypie/authentication.py",
>
> line 490, in is_authenticated
> check = backend.is_authenticated(request, **kwargs)
>
> File
> "/home/bats/.virtualenvs/bats/lib/python2.7/site-packages/tastypie/authentication.py",
>
> line 194, in is_authenticated
> user = User.objects.get(**lookup_kwargs)
>
> File
> "/home/bats/.virtualenvs/bats/lib/python2.7/site-packages/django/db/models/manager.py",
>
> line 143, in get
> return self.get_query_set().get(*args, **kwargs)
>
> File
> "/home/bats/.virtualenvs/bats/lib/python2.7/site-packages/django/db/models/query.py",
>
> line 382, in get
> num = len(clone)
>
> File
> "/home/bats/.virtualenvs/bats/lib/python2.7/site-packages/django/db/models/query.py",
>
> line 90, in __len__
> self._result_cache = list(self.iterator())
>
> File
> "/home/bats/.virtualenvs/bats/lib/python2.7/site-packages/django/db/models/query.py",
>
> line 301, in iterator
> for row in compiler.results_iter():
>
> File
> "/home/bats/.virtualenvs/bats/lib/python2.7/site-packages/django/db/models/sql/compiler.py",
>
> line 775, in results_iter
> for rows in self.execute_sql(MULTI):
>
> File
> "/home/bats/.virtualenvs/bats/lib/python2.7/site-packages/django/db/models/sql/compiler.py",
>
> line 839, in execute_sql
> cursor = self.connection.cursor()
>
> File
> "/home/bats/.virtualenvs/bats/lib/python2.7/site-packages/django/db/backends/__init__.py",
>
> line 321, in cursor
> self.validate_thread_sharing()
>
> File
> "/home/bats/.virtualenvs/bats/lib/python2.7/site-packages/django/db/backends/__init__.py",
>
> line 154, in validate_thread_sharing
> % (self.alias, self._thread_ident, thread.get_ident()))
>
> DatabaseError: DatabaseWrapper objects created in a thread can only be
> used in that same thread. The object with alias 'default' was created in
> thread id 140625758729984 and this is thread id 140625691588352.
>
--
You received this message because you are subscribed to the Google Groups
"Django users" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to django-users+unsubscr...@googlegroups.com.
To post to this group, send email to django-users@googlegroups.com.
Visit this group at http://groups.google.com/group/django-users.
To view this discussion on the web visit
https://groups.google.com/d/msgid/django-users/c478117f-5cb0-4c44-9116-6dfbefcc2ad1%40googlegroups.com.
For more options, visit https://groups.google.com/d/optout.
