Looking for the latest Prefect 2 release? Prefect 2 and Prefect Cloud 2 have been released for General Availability. See https://docs.prefect.io/ for details.

Prefect 1 is a workflow management system that makes it easy to take your data pipelines and add semantics like retries, logging, dynamic mapping, caching, failure notifications, and more.

We started with a simple premise:

Your code probably works. But sometimes it doesn't.

When your code works as expected, you probably don't even need a workflow system. We call that positive engineering - code that achieves your business objective. It's only when things go wrong that a system like Prefect starts to be valuable. That's negative engineering: all the little details that guarantee your code either achieves its goal, or fails successfully. In this way, workflow systems are actually risk management tools, like insurance: there when you need them, invisible when you don't.

And yet, we don't see a single tool designed that way. Other workflow systems seem to believe that they're actually positive engineering tools, somehow enabling users to do things they couldn't do otherwise. As a result, they feel no shame in asking users to generate yet another config file, or contort code into a convoluted DAG structure. Prefect already knows you can write incredible code; it just wants to make sure it works.

Prefect 1 takes your code and transforms it into a robust, distributed pipeline. You can continue to use your existing tools, languages, infrastructure, and scripts. Prefect 1 builds a rich DAG structure, but in a way that respects positive engineering and doesn't inhibit it. You can use Prefect's functional API to transform scripts with minimal hooks; or you can access the deferred computational graph directly; or any combination thereof. It's up to you.

Prefect 2 takes it even further by allowing you to run any code without requiring a DAG structure. For more details on that, check out the Prefect 2 documentation.

Happy engineering!

- The Prefect Team