Task chain through scheduling suddenly stops working

[ITQliker]

Hello everyone,

I'm using the fairly new scheduling function to create task chains. Our apps reload every 30 minutes, since the smallest interval is 1h, we have two task chains, one for XX:00 and one for XX:30. This has worked flawlessly for multiple months, but now, the task chain just stops working for some apps.

The app DM SAP Facts runs twice per hour and is supposed to trigger several other apps after completion. Some of them have just stopped reloading yesterday, while others that have the same trigger run just fine. I can still start the tasks manually. There are no errors thrown or anything, I only noticed because a user was missing new data. Any idea what could be the issue?

The schedule of the DM SAP FactsThe schedule of one the apps that's supposed to run after the DM SAP Facts

[TomL]

We were having the same issue.  It ended up being that one of the downstream app reload schedules erroneously had two tasks assigned to follow the same trigger. There are ~25 tasks following a similar XX-00, XX-30 setup.  One had two tasks assigned to follow XX-00.  This would result in about 5/25 tasks never triggering at all and it was always the same 5.  The app that had the duplicated task would actually succeed but its task history would have a success and a failure for each XX-00 trigger.  This made it tough to find the culprit.