Notification: Upcoming scheduled maintenance periods April 28th, 2010 and May 5th, 2010

[App Engine Team]

This is a notification to our developers on App Engine that there will
be two
upcoming maintenance periods:

April 28th, 2010: 1pm-2pm Pacific
May 5th, 2010: 1pm-2pm Pacific

The datastore will be in read-only mode during these maintenance
periods;
all datastore writes and transactions will throw an exception.
During scheduled maintenance, memcache will also be disabled.
Calls to the memcache API will not throw exceptions. Instead, they
will
return False for set() calls and None for get() calls (just like any
other cache miss). In addition, memcache API calls will return
immediately during this period, without any additional latency.

It is recommended that critical portions of your application which
depend on datastore writes are modified to gracefully degrade. Links
to our documentation with code samples are below:

Python: http://code.google.com/appengine/docs/python/howto/maintenance.html
Java: http://code.google.com/appengine/docs/java/howto/maintenance.html

You can subscribe to our maintenance calendar here:

Google Calendar:
http://www.google.com/calendar/embed?src=4chlpo92ci2f54c2u21shbjk9o%40group.calendar.google.com&ctz=America/Los_Angeles
iCal: http://www.google.com/calendar/ical/4chlpo92ci2f54c2u21shbjk9o%40group.calendar.google.com/public/basic.ics

We will send out additional notifications on this mailing list as each
date
approaches as well as any updates on our progress.

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