Hi Vinny P, Thanks for your replying.
I'm sure there's no any log neither my own logs. This mail queue is built by my self, in fact, it's a sub-queue from a process queue. It was happened on 8/10 at the first time, and the second time was happened on 8/13. This system have run for a month, start from 7/1. I just can figure out why a simple update can't be done but the insert action is totally no problems. If there's something wrong with the persistence manager, the insert action should not succeed. And no any other update failed like this. I think I'll try that AppStats tool to see what's happened. Thanks. Brandon Vinny P於 2013年8月14日星期三UTC+8下午2時56分31秒寫道： > > On Tue, Aug 13, 2013 at 1:19 AM, Brandon <bran...@tradeserv.com<javascript:> > > wrote: > >> There are no any error was found in GAE logs, and my own logs neither. >> >> > > > Are you sure there aren't any logs? If you're deploying multiple version > or backends, make sure to look at those logs as well. Go to the Logs page, > on the very top there's a dropdown box where you can select different > versions of your application. Check each version that runs this service. > > > On Tue, Aug 13, 2013 at 1:19 AM, Brandon <bran...@tradeserv.com<javascript:> > > wrote: > >> There is a MailQueue table in my system and a column is named STATUS to >> mark up whether this queue is sent or not. >> > > > By "queue", do you mean the Task Queue service or are you building your > own queuing system? Instead of having to keep track of whether the email > was sent successfully, you should convert your code to use the Task Queue > service which can track the successful execution of your code - and if > necessary retry it in case of failure. See > https://developers.google.com/appengine/docs/java/taskqueue/ > > > On Tue, Aug 13, 2013 at 1:19 AM, Brandon <bran...@tradeserv.com<javascript:> > > wrote: > >> The weird thing is that the insert action is totally works fine but the >> update is not. >> Although it will not sent repeatedly but the column still have chance to >> be unable to update. >> The MailQueue will be generated everyday, and the number is about 135. >> > > > How many times has this happened? If it's a very rare occurrence, there > might have been a problem with your instance. If it happens more > frequently, you should install AppStats > https://developers.google.com/appengine/docs/java/tools/appstats to > see what's occurring in the background. > > > ----------------- > -Vinny P > Technology & Media Advisor > 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. For more options, visit https://groups.google.com/groups/opt_out.
