We use ODK Collect and Aggregate to collect and submit data to Fusion Tables which is our main repository after collection. We are mostly a seasonal operation, with prime data collection occurring between roughly March to October of every year. We've been slowly becoming more reliant on it since 2011.
There have always been a few duplicate entries, but nothing major, and easy enough to remove. This year though, I've been seeing up to 100 to 200 duplicate entries in our bigger tables, around 1500 to 2000+ records. I've seen as many as 5 duplicates per record, although usually not more than 2 or 3.
I don't know what could have changed this year though. Most of the entries I've seen on the topic in the forum here suggest this was a problem mostly taken care of years ago.
What ODK tool and version are you using? And on what device and operating system version?
As far as I can tell, this has occurred while using Aggregate 1.6.x since March, and whichever Collect versions have been released during that time frame.
What steps can we take to reproduce the problem?
I am not sure. We just submit forms and get duplicates.
What you have you tried to fix the problem?
I'm not sure what to try. I'm hoping for suggestions. It's possible there is something external to ODK in our environment interfering with Fusion Table's publishing reply, but I have to start with ODK first.
I'm attaching a file with two GAE Application logs from Stackdriver Logging that I think recorded an instance of duplicate records being created today.
gae_app__logs__2018-11-02T01-00.json (62.9 KB)