We do continuous deployment as well, although not 30 a day. I can't quite remember when there started being issues with 500s being served when deploying an app, but it wasn't always the case. Appengine used to just handle deploying newer code to the same version and start up new instances, shutting down old ones naturally.
We basically have two versions, one set to default, and another used for smoke test and to host while we're deploying. We upload new code to the smoke testing environment, smoke test, then switch it to default. Then we deploy to the other version and flip it back to default. Occasionally the behaviour doing this changes (for a while the old instances on the old version didn't shutdown, and had to be done manually), but that's the nature of appengine. Issue to star if you're interested (this affects everyone, any deployment will currently cause downtime to consumers for a small window - 2 seconds to a couple of minutes, there will be no indication of this in your logs at all): http://code.google.com/p/googleappengine/issues/detail?id=7874&q=Deploy&colspec=ID%20Type%20Component%20Status%20Stars%20Summary%20Language%20Priority%20Owner%20Log -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To unsubscribe from this group and stop receiving emails from it, send an email to google-appengine+unsubscr...@googlegroups.com. To post to this group, send email to google-appengine@googlegroups.com. Visit this group at http://groups.google.com/group/google-appengine. For more options, visit https://groups.google.com/groups/opt_out.
