I also experienced these again recently, they are part of the rare appengine issue bursts, rarely things go wrong and deadline exceptions, transient errors and these errors arise, it's expected (at least I come to expect them)
I used to experience these every day, but throttling my routines prevented them The sad truth is, appengine can't handle too much acceleration, bursting of tasks etc. - so throttling the routine that caused these errors will fix the issue - it's what I did, after reducing my taskqueue rates and buckets, the issue was gone -- 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. To view this discussion on the web visit https://groups.google.com/d/msgid/google-appengine/12fb4c3f-1945-4644-9925-0cf312927b63%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
