Scheduled maintenance today at 5:00pm PST

[Pete Koomen]

Today (November 26th) App Engine will undergo maintenance at 5pm PST
(GMT-8) for approximately 30 minutes for a hardware upgrade.

During this period all App Engine apps will revert to read-only mode,
and all datastore writes and transactions will throw an exception. If
you'd like to modify your app to catch this exception, here is the
exception:

exception
google.appengine.runtime.apiproxy_errors.CapabilityDisabledError

This will be thrown by db.Model.put(), db.Model.delete(), and
db.run_in_transaction(). You can use Python's try syntax to fail
gracefully on writes like this:

from google.appengine.ext import db
from google.appengine.runtime.apiproxy_errors import
CapabilityDisabledError

myModel = db.Model()
try:
myModel.put()
except CapabilityDisabledError:
# fail gracefully here
pass

The memcache API will also be disabled during this period. Calls to
memcache will not throw exceptions but will instead immediately return
False for set() calls and None for get() calls (just like any other
cache miss.) We've also implement a fix that should prevent the load
increase resulting from this memcache outage from affecting the
serving of your application.

Pete Koomen, App Engine Team

[Pete Koomen]

This maintenance has begun.

[Pete Koomen]

This maintenance was completed at 8:45 PM PST.

[Pete Koomen]

The read-only portion of this maintenance period lasted for
approximately 25 minutes. We appreciate your patience!

Pete, App Engine Team