Every so often (once a month or less), I get an instance that just doesn't
work. Every request fails with some error in library code that indicates
something is profoundly screwed up, like an import fails or some line of
obviously correct code throws an exception.
When this has happened in the past, I would get a bunch of error emails and
I would just shutdown the instance and hope that it was a fluke. Today it
happened while I was on a flight, so for about 3 hours, this broken
instance was returning errors for most of the requests hitting my app.
This is the exception (app named changed to protect the innocent):
Traceback (most recent call last):
File
"/base/data/home/apps/s~xxx/8.374612775992938880/django/core/handlers/base.py",
line 101, in get_response
resolver_match = resolver.resolve(request.path_info)
File
"/base/data/home/apps/s~xxx/8.374612775992938880/django/core/urlresolvers.py",
line 318, in resolve
for pattern in self.url_patterns:
File
"/base/data/home/apps/s~xxx/8.374612775992938880/django/core/urlresolvers.py",
line 346, in url_patterns
patterns = getattr(self.urlconf_module, "urlpatterns",
self.urlconf_module)
File
"/base/data/home/apps/s~xxx/8.374612775992938880/django/core/urlresolvers.py",
line 341, in urlconf_module
self._urlconf_module = import_module(self.urlconf_name)
File
"/base/data/home/apps/s~xxx/8.374612775992938880/django/utils/importlib.py",
line 40, in import_module
__import__(name)
File "/base/data/home/apps/s~xxx/8.374612775992938880/urls.py", line 4,
in <module>
from swaagit import admin as swaag_admin, sites
File "/base/data/home/apps/s~xx/8.374612775992938880/xxx/admin.py", line
12, in <module>
from mapreduce.site import site as mapreduce_site
File "/base/data/home/apps/s~xxx/8.374612775992938880/xxx/mapreduce/site.py",
line 5, in <module>
from mapreduce import base_handler
File
"/base/data/home/apps/s~xxx/8.374612775992938880/mapreduce/base_handler.py",
line 44, in <module>
from mapreduce import model
File "/base/data/home/apps/s~xxx/8.374612775992938880/mapreduce/model.py",
line 61, in <module>
from mapreduce import context
File "/base/data/home/apps/s~xxx/8.374612775992938880/mapreduce/context.py",
line 40, in <module>
from google.appengine.ext import ndb
File "/base/data/home/runtimes/python27/python27_lib/versions/1/
google/appengine/ext/ndb/__init__.py", line 8, in <module>
__all__ += tasklets.__all__
NameError: name 'tasklets' is not defined
Clearly a NameError in SDK code means that something is very wrong. Yet,
this instance happily continued serving traffic for hours.
Are there not some smoke tests or verification tests that are run before an
instance is put into production? How does everybody else deal with this
problem?
--Alex
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