turbaszek commented on a change in pull request #11467:
URL: https://github.com/apache/airflow/pull/11467#discussion_r503549978
##########
File path: docs/scheduler.rst
##########
@@ -65,3 +65,72 @@ If you want to use 'external trigger' to run future-dated
execution dates, set `
This only has effect if your DAG has no ``schedule_interval``.
If you keep default ``allow_trigger_in_future = False`` and try 'external
trigger' to run future-dated execution dates,
the scheduler won't execute it now but the scheduler will execute it in the
future once the current date rolls over to the execution date.
+
+Running more than one scheduler
+-------------------------------
+
+Airflow 2.0 is the first release that officially supports running more one
scheduler concurrently -- both for
+performance reasons and for resiliency.
+
+Overview
+""""""""
+
+The HA scheduler is written to take advantage of the existing metadata
database. This was primarily done for
Review comment:
```suggestion
The highly available (HA) scheduler is designed to take advantage of the
existing metadata database. This was primarily done for
```
Not every user have to be familiar with this acronym
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