Bring your towel and join one of the fastest growing data communities. Welcome to our second-generation open source orchestration platform, a completely rethought approach to dataflow automation.

Prefect Community

Hi. I'm wondering what is the recommended way to run only parts of a flow. For example only tasks with certains tags.

Hi <@U0134NW5M8X> - right now Prefect doesn't have a concept of running single tasks within a Flow. However, you could accomplish something like this by using <https://docs.prefect.io/core/idioms/branching.html#creating-conditional-branches-in-a-flow|conditional branches>, <https://docs.prefect.io/core/task_library/control_flow.html#if-else|ifelse tasks>, or <https://docs.prefect.io/api/latest/tasks/control_flow.html#functions|switch tasks>

Hi <@U0134NW5M8X>! We don't support that in a first-class way at the moment, but it's definitely on our radar. If you don't mind sharing, we'd love to hear your use case and have you chime in on this issue!

<https://github.com/PrefectHQ/prefect/issues/2269>

Thanks for the hints. I guess it relates also to best practices using prefect. I'm essentially building an ETL style flow. Now I only want to run the "T" part of it and I'm wondering how to best achieve this in prefect.

My suggestion for now would be to use <https://docs.prefect.io/core/concepts/parameters.html#parameters|parameters> to accomplish this, where perhaps E and L would be skipped given a certain parameter value and T would run even if E was skipped.

but as Zachary mentioned, we're actively looking into how we can make that possible without additional code! :slightly_smiling_face:

Thanks a lot again. I'm really enjoying prefect a lot from a developer/data science perspective.