search

ubx / start-list

Distributed start list for glider pilots
http://start-list-hrd.appspot.com/?place=grenchen%20gld
3 stars 0 forks source link

Migrating to the High Replication Datastore #58

Open ubx opened 12 years ago

ubx commented 12 years ago

https://developers.google.com/appengine/docs/adminconsole/migration

ubx commented 12 years ago

Dear App Engine Developer,

We’ve noticed that you are running at least one application configured to use the Master/Slave (M/S) datastore. This application configuration was officially deprecated on April 4, 2012, in accordance with our deprecation policy, in favor of the more reliable High Replication Datastore (HRD). HRD uses the Paxos algorithm to serve your application out of multiple datacenters, meaning better redundancy in the face of datacenter issues, more consistent datastore performance, and no planned downtime.

When we deprecated the M/S datastore, we introduced a migration tool that allows you to easily migrate all your datastore and blobstore data to a new HRD application. Migrating your application will not require you to change your application’s URL, whether it serves from appspot.com or a custom domin. Please note that even if your application does not store any data in the datastore, it will still benefit from the automated datacenter failover that is only available to HRD applications.

Before migrating your application, you should read about the differences between M/S and HRD, and understand how the consistency policy for HRD might affect the queries in your application.

All HRD applications that have billing enabled are covered by App Engine’s 99.95% uptime SLA. Along with the substantial reliability improvements, many new App Engine features are only being made available to HRD applications, including the Python 2.7 language option, Full Text Search (FTS), and Page Speed integration.

We strongly encourage you to migrate your applications as soon as possible. If you have technical questions about HRD or the migration process, you can post them to Stack Overflow. Any general migration discussions can be posted to our Google Group.

Thank You,

The App Engine Team

© 2012 Google Inc. 1600 Amphitheatre Parkway, Mountain View, CA 94043 You have received this mandatory email service announcement to update you about important changes to your Google App Engine account.