<@ULVA73B9P> would it be possible to skip or mark ...
# ask-marvin
j
@Marvin would it be possible to skip or mark a task as skip (as with prefect 1) in prefect 2.10.21? I'm looking to create some sort of error handler wrapper that if a task fails it does not fail the flow
m
In Prefect, you can control the flow of tasks based on certain conditions or custom logic. For example, you can conditionally stop a task run, ensure tasks immediately fail if an upstream task fails, or define state dependencies between tasks. This allows you to create a sort of error handler wrapper that prevents a flow from failing when a task fails. However, I couldn't find any specific information about skipping or marking a task as skip in Prefect 2.10.21. If you want to delve deeper into this topic, you might want to check out the following resources: - Conditionally Stop a Task Run - Ensure Tasks Immediately Fail If Upstream Task Fails - Define State Dependencies Between Tasks Remember, I'm just a robot, so you might want to consult the Prefect community or documentation for more specific advice.
j
@Marvin what I'm trying to do is create a wrapper around tasks that will always result in the error being logged, but non-dependent downstream tasks will continue to be executed
m
In Prefect, you can use a try/except block in your task function to catch exceptions and log errors without causing the task to fail. Here's a simple example:
Copy code
python
from prefect import task, Flow
import logging

@task
def my_task():
    try:
        # Your task logic here
    except Exception as e:
        logging.error(f"An error occurred: {e}")
        return

with Flow('My Flow') as flow:
    my_task()

flow.run()
In this example, if an exception is raised within the try block, the error will be logged and the task will return without failing. This allows downstream tasks to continue executing even if an error occurs in this task. However, please note that this approach will only work for tasks that do not have downstream tasks that depend on their output. If a downstream task depends on the output of a task that encountered an error, it will not be able to execute properly. Remember, I'm just a robot, so you might want to consult the Prefect community or documentation for more specific advice.
j
@Marvin prefect dask submit on task causing all other dependent tasks to crash, however not submitting this task allows it to run, but we lose concurrency
m
I'm sorry, but I couldn't find any specific issues related to Dask tasks causing dependent tasks to crash in Prefect on GitHub. This could be a complex issue that might be related to your specific use case or configuration. Here are a few general suggestions that might help: - Make sure you're using compatible versions of Prefect and Dask. Incompatibilities between versions can sometimes cause unexpected behavior. - Check the logs for any error messages or warnings that might give you more information about what's causing the tasks to crash. - Try isolating the problem by running a simplified version of your flow with fewer tasks. This can help you determine whether the issue is with a specific task or with the way your tasks are interacting. - If you're running your flow on a Dask cluster, make sure the cluster has enough resources (CPU, memory, etc.) to handle all of your tasks. If none of these suggestions help, I recommend reaching out to the Prefect community for assistance. They might be able to provide more specific advice based on their experience with similar issues.