Running `airflow scheduler` launches 33 scheduler processes

Question

When using LocalExecutor with a MySQL backend, running airflow scheduler on my Centos 6 box creates 33 scheduler processes, e.g.

Answer 1

Yes this is normal. These are scheduler processes. You can control this using below parameter in airflow.cfg

# The amount of parallelism as a setting to the executor. This defines
# the max number of task instances that should run simultaneously
# on this airflow installation
parallelism = 32

These are spawned from scheduler whose pid can be found in airflow-scheduler.pid file

so 32+1=33 processes that you are seeing.

Hope this clears out your doubt.

Cheers!