Hi probably straightforward question on Prefect 1 x how do y

Question

Hi probably straightforward question on Prefect 1 x how do you force a flow to fail if a task fails

Claire Herdeman · Answer

I ve got a `AWSCLientWait` task that fails as desired when a Batch job failures All of the following tasks have `TriggerFailed` but the final state of the flow us `SUCCESS`

Claire Herdeman · Answer

``` 2022 10 19 15 39 49+0000 INFO prefect TaskRunner | Task AWSClientWait Starting task run 2022 10 19 15 44 50+0000 INFO prefect TaskRunner | FAIL signal raised FAIL AWS batch waiter JobComplete failed with Waiter JobComplete failed Waiter encountered a terminal failure state For expression jobs status we matched expected path FAILED at least once 2022 10 19 15 44 50+0000 INFO prefect TaskRunner | Task AWSClientWait Finished task run for task with final state Failed 2022 10 19 15 44 50+0000 INFO prefect TaskRunner | Task load mapping to schema Starting task run 2022 10 19 15 44 50+0000 INFO prefect TaskRunner | Task load mapping to schema Finished task run for task with final state TriggerFailed 2022 10 19 15 44 50+0000 INFO prefect TaskRunner | Task transform and upsert Starting task run 2022 10 19 15 44 50+0000 INFO prefect TaskRunner | Task transform and upsert Finished task run for task with final state TriggerFailed 2022 10 19 15 44 50+0000 INFO prefect TaskRunner | Task delete schema Starting task run 2022 10 19 15 44 50+0000 INFO prefect TaskRunner | Task delete schema Finished task run for task with final state Skipped 2022 10 19 15 44 50+0000 INFO prefect FlowRunner | Flow run SUCCESS all reference tasks succeeded```

Marwan Sarieddine · Answer

gt ```Flow run SUCCESS all reference tasks succeeded``` As this log statement indicates a flow s state is determined by the reference tasks So if you want to ensure a flow fails when a given task fails you need to make sure the task s failure path leads to a failure in a reference task

Marwan Sarieddine · Answer

You can set reference tasks explicitly by calling something like ```flow set reference tasks submitted ``` See <https docs v1 prefect io core about prefect next steps html reference tasks|the docs here> for more details

Claire Herdeman · Answer

Knew it would be straightforward thanks for the quick response