Hey Alexandru & Ice13ill, These error codes represent several different issues.
500 means an internal server error, which is not specific enough to determine a cause unless you check the logs of your app / server. 404 means a resource was requested but not found, most often since no request handler is configured for the route requested. 104 is an App Engine error code used when concurrent requests are not configured on your app <https://cloud.google.com/appengine/articles/deadlineexceedederrors> (threadsafe is false in app.yaml or appengine-web.xml) Finally, ConcurrentModificationExceptioYou can read about how to avoid this in the documentationn is an error relating to the concurrent modification of a Datastore entity group too often in a given timeframe. You can read about how to avoid this in the documentation [1] <https://cloud.google.com/appengine/articles/handling_datastore_errors>, [2] <https://cloud.google.com/appengine/articles/scaling/contention>. If you could post the full stack traces / error logs, this would greatly increase anybody's ability to determine what was happening. Now that the issues have resolved, it's possible that it may simply be beyond anyone to try to determine what's happening. Feel free to ask any questions you may have, I'll be happy to help. Sincerely, Nick Cloud Platform Community Support On Thursday, April 28, 2016 at 6:06:08 AM UTC-4, Alexandru Farcaş wrote: > > Hi, > > I have multiple errors with error code 104. I have this behaviour since > 11:50am EEST. > I receive a lot of errors at task creation. I receive this errors but the > tasks are still created in task queue! > > java.util.ConcurrentModificationException >> too much contention on these >> datastore entities. please try again. > > > > -- 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 [email protected]. To post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/google-appengine. To view this discussion on the web visit https://groups.google.com/d/msgid/google-appengine/35196a3b-0484-412a-a8e4-2cd0b4ffae09%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
