I would say that's a case where you easily can be backward compatible. Then hash them at you leisure.
On Sep 22, 7:46 pm, Kyle Baley <[email protected]> wrote: > Here's one extreme example. In the original data model, the password > isn't encrypted. In the new one, it is. > > On Sep 22, 4:41 am, Tim Hoffman <[email protected]> wrote: > > > > > Why can't you push the version 2, start updating the data > > but still keep running version 1 until the data update has finished. > > > That I believe is the normal recommended approach. > > > Is there something about your new version 2 data model that will break > > version 1 ? > > > T > > > On Sep 21, 2:29 am, Kyle Baley <[email protected]> wrote: > > > > We've just released the first version of our application and are now > > > looking at a problem we've been avoiding until now. Namely, what is > > > the best way to upgrade the application to a new version that requires > > > changes to the datastore. We're looking at two options: > > > > 1) Big Bang Upgrade > > > We take the application down and run an upgrade process to update all > > > entities from version 1 to version 2. > > > > Pros: Easy to maintain; intuitive > > > Cons: App has to be taken down for a period of time, which will > > > increase as time passes and more data is added to the datastore > > > (potentially hitting the limit for long-running processes eventually) > > > Question: What's a good way to take the app offline? > > > > 2) Version Entities Individually > > > Each entity has a version number and we have a series of commands, > > > each one responsible for upgrading an entity from one version to the > > > next. As we request entities, we check to see if it's the latest > > > version. If not, we run each necessary upgrade command in sequence > > > until it is the latest version. > > > > Pros: No need to take the app offline; provides flexibility on whether > > > to upgrade everything at once or piecemeal > > > Cons: Not as intuitive; entities with different versions in the > > > datastore (if that matters) > > > > What do other people do to upgrade their datastore for a live > > > application? -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.
