is it possible to run 2 tasks from 1 task For example ``` gt

Question

is it possible to run 2 tasks from 1 task For example ``` gt task b | | task a gt task d | | gt task c ``` If so will `task d` wait for both `task b` and `task c` to finish before executing Any guidance on this would be greatly appreciated Thanks

Matt Fysh · Answer

tasks can t call other tasks I think you might be talking about flows subflows im pretty new to prefect but I think what you want to do is make your flow async and then ``` flow async def my flow future1 = task b future2 = task c result1 = await future1 result2 = await future2 task d result1 result2 ```

Nathan Low · Answer

You might want to use wait for <https docs prefect io concepts flows return a future> ``` flow def always succeeds flow x = always fails task submit result raise on failure=False y = always succeeds task submit wait for= x return y```

Nathan Low · Answer

You ll want a flow that runs one task has two tasks that wait for the 1st task and a 4th task that waits for task 2 and 3

Choenden Kyirong · Answer

hmm okay I ll look into these Thanks < Nathan Low> < Matt Fysh>

Choenden Kyirong · Answer

< Nathan Low> Would this be something to similar to airflows ```first task gt gt second task third task third task lt lt fourth task or first task set downstream second task third task third task set upstream fourth task ```

Choenden Kyirong · Answer

which produces a flow like this

Choenden Kyirong · Answer

I think you re right < Nathan Low> `wait for` might do it ``` flow def my flow x = task a future2 = task b x submit future3 = task c x submit z = task d wait for= future2 future3 ```

Matt Fysh · Answer

if you don t need to pass data from tasks B amp C into task D then wait for is what you re looking for <https docs prefect io latest concepts tasks wait for>

Choenden Kyirong · Answer

okay great Thanks < Matt Fysh>