@Marvin i wanted to persist the input to the task1 and output from the task1 in case task2 failed in the flow and i would like to refactor the code so that i can start from the exact same point without retrying the flow, how can i achieve so please help. I am using prefect versin 3

So you want to save the input and output of Task1 so you can resume your flow at Task2 without repeating Task1 if it fails. Got it. Let's look into Prefect 3.x docs for how to persist task inputs and outputs and resume execution. Give me a moment to find the details. Here’s the scoop: 1. Persisting Task Inputs/Outputs: Prefect 3 allows tasks to be resumed by making use of "Resuming flows". Essentially, you can pause the flow after Task1 completes and then resume the same flow from Task2 whenever you're ready. 2. Pausing and Resuming: You can use the

pause_flow_run

function to pause the flow after Task1 and then resume it using

resume_flow_run

. 3. Implementation Steps: - Task Definition:

python
     from prefect import task, flow, pause_flow_run, resume_flow_run
     
     @task(persist_result=True)
     def task_one():
         # Your task one code
         return "some result"

     @task
     def task_two(input_data):
         # Your task two code using input_data from task one

- Flow Definition:

python
     @flow(persist_result=True)
     def my_flow():
         result1 = task_one.submit()
         pause_flow_run(timeout=300)  # Pause the flow for 5 minutes or specify the suitable timeout
         result2 = task_two(result1.result())

To resume the flow:

python
from prefect import resume_flow_run

resume_flow_run(flow_run_id=<flow_run_id>)

For more details, here's the link to the relevant Prefect 3.0 documentation. By doing this, you'll be able to ensure that restarting the flow by Task2 wouldn't need retrying Task1.