I didn't mean to say that Alexis's bugs aren't real, just that the presence of 2 bugs shouldn't prevent someone from starting the conversion to the new system.
You can't make the move without testing. There are bugs in 2.5. Your odds of hitting a bug is higher on 2.7, but they are far from guaranteed. I would go so far as to say if your average request is less than 5 seconds, your move is most likely to be painless. Most of the issues that are cause by the high computation bug can be avoided by splitting task across more than one request, or offloading to a back end instance. Not Ideal, but not insurmountable. Even with the changes necessary to avoid the scenarios that cause the high computation but 2.7 is significantly faster than 2.5 and more cost effective. If you don't want to modify your code setting Min Idle Instance Higher will prevent most issues as well at the expense of more instance hours. 2.7 does occasionally have long start up times. This can be avoided by using a warmup in the app.yaml and avoiding splitting your files across too many .py files (not sure why this matters but it seems to) 2.7 is also much happier if your initialization variables are pulled from mem-cache not datastore. Part of that whole you have to initialize quickly or things get really slow. As a result it is not a bad idea to read and re-write any initialization variables to memcache at the start of each request. Doing this using serialized data makes this VERY fast. If you have to use DataStore (which you do) you should also serialize the initialization variables so that you need only make one call rather than 1 for each value. 2.7 does seem to have some interesting potential security holes, but these are "by design" and are avoidable if you don't want them, and can be used for certain performance increase if you know what you are doing. I believe there are also a few subtle difference in some of the Typing that may impact you if you are building non-english apps. -----Original Message----- From: google-appengine@googlegroups.com [mailto:google-appengine@googlegroups.com] On Behalf Of Brian Quinlan Sent: Saturday, December 03, 2011 4:16 AM To: google-appengine@googlegroups.com Subject: Re: [google-appengine] Re: Doom day Hi Brandon, On Sat, Dec 3, 2011 at 8:11 PM, Brandon Wirtz <drak...@digerat.com> wrote: > I run on 2.7. I have been rock solid and my costs are 1/10th what they > are on 2.5 Wow, that's awesome! > I had very few code changes other than removing CGI handlers. Also good news. > I would recommend 2.7 without hesitation. > > Pointing out 2 bugs that aren't well documented, and (one of which I > can't > Repo) Is more of a "I'm too lazy to do the migration" than a real excuse. > If you aren't testing on 2.7 you are weeks from being deployed on it > anyway, and are just griping. Get a test version of your app on it, > find out where it fails and if you have bugs file them. Don't be a > wuss unless you have the same code snippet that is listed in a bug in > your source code. Then I might say you should test on 2.7 but not > invest time in adapting the code beyond removing 2.7 incompatible code. Both of the bugs that Alexis mentioned are significant and we can reproduce them - though the probability of being affected by http://code.google.com/p/googleappengine/issues/detail?id=6401 should be pretty low. Python 2.7 is still experimental and your good experiences aren't a guarantee that others won't encounter serious problems. Cheers, Brian > -Brandon > > > > -----Original Message----- > From: google-appengine@googlegroups.com > [mailto:google-appengine@googlegroups.com] On Behalf Of Alexis > Sent: Saturday, December 03, 2011 1:02 AM > To: Google App Engine > Subject: [google-appengine] Re: Doom day > > We are still using Python25 too and don't feel confident moving our > production apps to 2.7 when seeing issues like this: > > http://code.google.com/p/googleappengine/issues/detail?id=6401 > > or this: > > http://code.google.com/p/googleappengine/issues/detail?id=6323 > > or the one Kaan linked to... > > -- > 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. > > > -- > 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. > -- 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. -- 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.
