in prefect 1 I am trying to use `get task run result` to get

Question

in prefect 1 I am trying to use `get task run result` to get the results of a task called within a `resource manager` Seems the resource manager cleans up the task s result so it is unavailable to another flow ``` 12 43 06 | ERROR | Task get task run result Exception encountered during task execution Traceback most recent call last File Users jonyoung Dev workflows venv lib python3 9 site packages prefect engine task runner py line 880 in get task run state value = prefect utilities executors run task with timeout File Users jonyoung Dev workflows venv lib python3 9 site packages prefect utilities executors py line 468 in run task with timeout return task run args kwargs type ignore File Users jonyoung Dev workflows venv lib python3 9 site packages prefect tasks prefect flow run py line 239 in get task run result return task run get result File Users jonyoung Dev workflows venv lib python3 9 site packages prefect backend task run py line 79 in get result self result = self load result File Users jonyoung Dev workflows venv lib python3 9 site packages prefect backend task run py line 85 in load result self load child results File Users jonyoung Dev workflows venv lib python3 9 site packages prefect backend task run py line 139 in load child results task run assert result type is okay File Users jonyoung Dev workflows venv lib python3 9 site packages prefect backend task run py line 162 in assert result type is okay raise ValueError ValueError The task result has no `location` so the result cannot be loaded This often means that your task result has not been configured or has been configured incorrectly ```

Jon · Answer

how to use these two together

Mason Menges · Answer

Hey < Jon> Are you persisting results to a storage backend generally speaking you d need to setup external storage for the results in order to access them once the flow run context it was created it is no longer available

Jon · Answer

no i am using this pattern <https discourse prefect io t how to pass data from a child flow to another task in a parent flow 126>

Jon · Answer

i was able to work around this by creating this task ``` prefect task name=HOIST TASK RESULT TASK NAME result=results LocalResult def hoist task result task result any gt any Used in conjunction with a Prefect resource manager Hoists a task s result out of a resource manager s scope into the Flow s scope so the result can be accessed externally Args task result any a Prefect tasks s result Returns any the Prefect tasks s result return task result```

Jon · Answer

then in the flow something like this ```with Flow as flow with ResourceManager as rm some result = do something result we want in parent flow = hoist task rersult some result ```

Jon · Answer

for me the question is whether we can declare a variable within a flow and set it later in the flow ```with Flow as flow some var = None with RM as rm some var = do something ```

Jon · Answer

which is much more pythonic than the way i solved this

Mason Menges · Answer

Hmm you could try running this with the flow set to `stored as script=True` I think the issue here ultimately boils down to the difference between registration build time vs run time basically when the flow is registered everything in the flow run context is statically defined so the values of the variables you have set aren t updated when the flow actually runs storing it as a script may help this but I haven t tried this particular pattern in prefect 1 That said this is much more easily accomplished in prefect 2 which has much better support for native python patterns

Jon · Answer

thx but tbh i m not following i am able to use `get task run result` in a parent flow to get a task result in a child flow when i put that task inside of a `resource manager` the result is suddenly unavailable with the error i shared above im not sure how that interacts with build vs run time since i am able to get the value that s generated during runtime when outside of the resource manager it seems to me the issue here is that the resource manager is destroying the result