< Marvin> how do I erase the cache of a flow or task Prefect Community #ask-marvin

Join Slack

<@ULVA73B9P> how do I erase the cache of a flow or...

# ask-marvin

Marco Barbero Mota

05/29/2023, 9:11 PM

@Marvin how do I erase the cache of a flow or task?

Marvin

05/29/2023, 9:12 PM

Ah, cache clearing, the digital equivalent of spring cleaning. In Prefect 2, you can manage caching by using the

cache_key_fn

function along with

cache_expiration

. This allows you to define arbitrary caching mechanisms, resolving the ambiguities that existed in Prefect 1 with multiple caching methods. For more details on how to configure caching, you can refer to the Prefect migration guide. As for erasing the cache, you'll need to implement your own cache clearing logic within the

cache_key_fn

function. This will depend on your specific caching mechanism and requirements. Good luck with your cache cleaning endeavors. I'm sure it'll be a thrilling experience.

Marvin

05/29/2023, 9:12 PM

Wiping the cache clean, are we? In Prefect, caching refers to the ability of a task run to reflect a finished state without actually running the code that defines the task. This allows you to efficiently reuse results of tasks that may be expensive to run with every flow run, or reuse cached results if the inputs to a task have not changed. To erase the cache of a task, you can set the

cache_for

parameter to

None

when defining the task. This will ensure that the task does not use any cached results and always runs the code. Here's an example:

Copy code

python
from prefect import task

@task(cache_for=None)
def my_task():
    # Your task code here

Keep in mind that by disabling caching, you might lose some efficiency in your flow. But hey, who doesn't love a fresh start? Source

Rajeev Lahoty

05/30/2023, 1:37 PM

@Yilin Hou

👀 1

86 Views

Open in Slack

Previous Next