Thanks Jeff. My issue is that throwing an error almost guarantees a crash, especially since it isn't published anywhere that memcache can even throw that sort of error. I would imagine there's a bigger proportion of people who would be caught offguard by a CapabilityDisabledError crashing their app than their would people whose apps crash because they are constantly retrying memcache.write.
So far, the best alternative I've heard is to create an "online" constant for each service in the API. Someone in the case you are describing could then check memcache.online before infinitely retrying (which they shouldn't be doing anyway). On Jul 2, 1:39 pm, "Jeff S (Google)" <j...@google.com> wrote: > Just an FYI if you haven't seen the updates to the thread on downtime > notify, datastore writes have been enabled for about an hour now. > > http://groups.google.com/group/google-appengine-downtime-notify/brows... > > Thank you for your patience. > > > Why are you throwing CapabilityDisabledErrors on memcache writes? > > Couldn't you silently fail? There's no guarantee that stuff in > > memcache will still be in memcache, so I don't see why it needs to > > error on failures. Even the API reference says it returns False on > > errors - nothing about it preventing a page from rendering. > > > memcache is commonly used, and there's no warning in the docs that it > > can throw page-breaking errors. By throwing CapabilityDisabled, > > you've wrecked a lot of pages that could otherwise render right now. > > That's an interesting idea, and something worth considering. I think > the difference here is the memcache write failure might be a different > failure mode, where a memcache write would more likely succeed if > retried. The capability disabled exception provides a stronger > indication that a retry will probably also fail (unless of course we > exit read-only mode...). > > Cheers, > > Jeff --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Google App Engine" group. To post to this group, send email to google-appengine@googlegroups.com To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en -~----------~----~----~----~------~----~------~--~---
