On Mon, Feb 9, 2015 at 5:00 AM, Kaan Soral <kaanso...@gmail.com> wrote:
> I see 30-40 failed defer tasks at production (out of a burst operation > that spanned 100.000's of tasks) > They fail with: "X-Appengine-Taskretrycount:1, > X-Appengine-Taskretryreason:Instance Unavailable" > The exception is a PermanentTaskFailure from run_from_datastore > > Does this mean that the tasks actually executed before, but faultily > re-triggered, and threw PermanentTaskFailure's because the previous > execution deleted the _DeferredTaskEntity entity? > (I'm trying to pinpoint the cause and the trigger so it doesn't happen > again, since these exceptions all happened once and have a low count, I'm > guessing this is a very edge behaviour) > When the 30 - 40 tasks failed, did they all fail at nearly the same time (within the same few seconds) or fail in groups within the burst operation? If so, I'd agree that this is probably very edge behavior. But before that, I would see if any of the tasks shared similar properties: for instance, were they unusually large or did they have significantly more complex serializations. There have been posts in the past (both here and SO) with similar issues but no definitive answers - the most popular fix seems to be slowing down the addition/execution of tasks. ----------------- -Vinny P Technology & Media Consultant Chicago, IL App Engine Code Samples: http://www.learntogoogleit.com -- 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/CALSvALAXtA0KhqkaMn8Mg_2wT4rb58NirJyVqq%2BRABsjx7Umfg%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
