Hey everyone,

Prerelease SDK 1.5.5 is now available for download! You can get it here:

Python:
http://code.google.com/p/googleappengine/downloads/detail?name=google_appengine_prerelease-1.5.5.zip

Java:
http://code.google.com/p/googleappengine/downloads/detail?name=appengine-java-sdk-prerelease-1.5.5.zip

We provide prerelease SDKs as previews for things to come. New features
should not work in production yet, and documentation is typically still a
work in progress. Release notes are below as well as in the prerelease
packages:

Python
===============================
- Python 2.7 is now available as an experimental runtime for all
applications
  using the High Replication Datastore. To upload your app to the Python 2.7
  runtime, change the runtime argument in your app.yaml to python27.
- We have released an experimental utility, available in the Admin Console,
to
  assist in migrating your application to the High Replication datastore.
This
  utility allows you to copy the bulk of your data in the background, while
the
  source application is still serving. You then need a brief read-only
period to
  migrate your application data while you copy the data that has changed
from
  the time the original copy started.
- We have increased the number of files you can upload with your application
  from 3,000 to 10,000.
- We have increased the size limit for a single file uploaded to App Engine
from
  10MB to 32MB.
- We have increased the Frontend request deadline from 30 seconds to 60
seconds.
- We have increased the URLFetch maximum deadline from 10 seconds to 60
seconds.
- We have increased the URLFetch Post payload from 1MB to 5MB.
- App Engine now supports Cross Group (XG) transactions with the High
  Replication Datastore, which allow you to perform transactions across
  multiple entity groups.
- We have released an experimental API that can write to Google Storage for
  Developers directly from App Engine.
- We have added a graph to the admin console that displays the number of
  instances for which you will be billed.
- In the XMPP API, get_presence() is deprecated in favor of using the
inbound
  presence handlers documented in

http://code.google.com/appengine/docs/python/xmpp/overview.html#Handling_User_Presence
.
- The Task Queue API 'target' parameter now accepts a new value,
  taskqueue.DEFAULT_APP_VERSION, which will send the task to the default
  frontend version, rather than the version or backend where the 'add'
method is
  being called.
- In the URLFetch API, make_fetch_call() now returns an RPC object.
- Fixed an issue in the Admin Console where the "Run Now" button did not
work
  for tasks with a '-' in the name.
- Fixed an issue where the SDK did not decode Base64 encoded blobs.
- Fixed an issue to provide a better error message when using the Mail API
to
  send email to an invalid user address.
- Fixed an issue in the SDK where a skip_files entry caused an ImportError
when
  the library was located elsewhere in the PYTHONPATH.
- Fixed an issue in the SDK index viewer where the arrows indicating whether
a
  query was ascending or descending were not properly rendered.
- Fixed an issue where httplib did not support the deadline argument for
  URLFetch calls.
    http://code.google.com/p/googleappengine/issues/detail?id=2216
- Fixed an issue where you could not schedule a cron job to run every 100
  minutes.
    http://code.google.com/p/googleappengine/issues/detail?id=5243
- Fixed an issue in the SDK where failed tasks retried immediately instead
of
  waiting for 30 seconds.
    http://code.google.com/p/googleappengine/issues/detail?id=5587
- Fixed an issue making it possible to modify request headers using the
deferred
  library.
    http://code.google.com/p/googleappengine/issues/detail?id=5861

Java
=============
- We have released an experimental utility, available in the Admin Console,
to
  assist in migrating your application to the High Replication datastore.
This
  utility allows you to copy the bulk of your data in the background, while
the
  source application is still serving. You then need to take a short
downtime to
  migrate your application data while you copy the data that has changed
from
  the time the original copy started.
- We have increased the number of files you can upload with your application
to
  from 3,000 to 10,000.
- We have increased the size limit for a single file uploaded to App Engine
from
  10MB to 32MB.
- We have increased the Frontend request deadline from 30 seconds to 60
seconds.
- We have increased the URLFetch maximum deadline from 10 seconds to 60
seconds.
- We have increased the URLFetch Post payload from 1MB to 5MB.
- App Engine now supports Cross Group (XG) transactions with the High
  Replication Datastore, which allow you to perform transactions across
multiple
  entity groups.
- We have released an experimental API that can write to Google Storage for
  Developers directly from App Engine.
- We have added a graph to the admin console that displays the number of
  instances for which you will be billed.
- In the XMPP API, getPresence() is deprecated in favor of using the inbound
  presence handlers documented in

http://code.google.com/appengine/docs/java/xmpp/overview.html#Handling_User_Presence
.
- Fixed an issue in the Admin Console where the "Run Now" button did not
work
  for tasks with a '-' in the name.
- Fixed an issue to provide a better error message when a user tries to
parse an
  HttpRequest's input stream more than once in a request.
- Fixed an issue to provide a better error message when using the Mail API
to
  send email to an invalid user address.
- Fixed an issue in the SDK where HttpServletRequest.getInputStream().read()
  always returned -1.
    http://code.google.com/p/googleappengine/issues/detail?id=5396
- Fixed an issue where you could not schedule a cron job to run every 100
  minutes.
    http://code.google.com/p/googleappengine/issues/detail?id=5861



--
Ikai Lan
Developer Programs Engineer, Google App Engine
plus.ikailan.com | twitter.com/ikai

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