potiuk edited a comment on issue #6740: [AIRFLOW-6181] Add InProcessExecutor URL: https://github.com/apache/airflow/pull/6740#issuecomment-563339004 > My main thought is where is this useful, that `airflow test` isn't? I remember reading somewhere about using `airflow test` as the entrypoint for IDE. In all other executors the main process is running subprocess.popen. That prevents python debuggers from debugging then new process forked as the result. So you cannot set breakpoint and hit "Debug" to get it working. The only way we could find so far was remote debugging, but it requires paid version of IntelliJ and it is rather complex to run. With this setting you go back to a "sane" way of debugging DAGs -you just add those two lines, set the breakpoint and use "Debug". I am not aware of any simple way of doing with with starting subprocesses. Unless someone knows it (but I have not heard it so far). Moreover with this we will also be able to debug the code inside Breeze using Docker integration (in the same super-intuitive and easy way). You just add two lines to your DAG, set your environment to point to your Docker image/container and you can use all the debugging features of your IDE out of the box to not only initialize but also execute your DAG. This is super-powerful. We are going to use it at our workshops we have this Friday and this is so much easier for the users to debug the DAGs this way. Even if you use other IDEs which have good debugging integration, it's going to be super easy because you debug it in exactly the same way as you debug other python programs (which means it will just work). I know @feluelle tried it before but could not make it work with the other executors.
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