Hi 1 0 we re seeing some strange behavior with child flows W

Question

Hi 1 0 we re seeing some strange behavior with child flows When a new version of a long running parent flow e g a backfiller is registered with prefect cloud some child flows kicked off with `prefect tasks prefect create flow run` are being canceled without any additional info in the logs Is this expected Has anyone else encountered similar behavior

Bianca Hoch · Answer

Hi Brian just for clarification is the new version of the parent flow being registered while an older version is still running

Bianca Hoch · Answer

Also would you mind sending over a few examples of the flow runs which are being cancelled

Brian Phillips · Answer

Yes I think both the parent and child flow are having new versions registered while the parent is running and multiple instances of the child are running Here is an example ID `2f4d6f6f 9a9a 43cc a487 ac2f772b8363`

Bianca Hoch · Answer

Thank you for sending over the ID After looking at the state change information for that run I can see that it was Cancelled with the following message `Flow 0125ceac 842a 43f8 ae1b e96ae55900e4 was archived `

Bianca Hoch · Answer

The only states that I m seeing for this particular run are `Scheduled` and `Cancelled` When a new version of a flow is registered the previous version is archived to ensure that only one version of the flow is active This would cause any deprecated child flows which are `Scheduled`to be `Cancelled`

Bianca Hoch · Answer

If you want to avoid this going forward changing the name of the flow even by one character at the point of registration should create a new flow group that isn t linked to the existing flow

Brian Phillips · Answer

Thanks for the info Bianca that s very helpful