[GitHub] [airflow] mik-laj commented on a change in pull request #6961: [AIRFLOW-XXX] Add task execution process on Celery Execution diagram

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mik-laj commented on a change in pull request #6961: [AIRFLOW-XXX] Add task execution process on Celery Execution diagram
URL: https://github.com/apache/airflow/pull/6961#discussion_r361939219
 
 

 ##########
 File path: docs/executor/celery.rst
 ##########
 @@ -143,3 +143,38 @@ The components communicate with each other in many places
 * [9] **Scheduler** --> **DAG files** - Reveal the DAG structure and execute the tasks
 * [10] **Scheduler** --> **Celery's result backend** - Gets information about the status of completed tasks
 * [11] **Scheduler** --> **Celery's broker** - Put the commands to be executed
+
+Task execution process
+----------------------
+
+.. figure:: ../img/run_task_on_celery_executor.png
+    :scale: 50 %
+
+    Sequence diagram - task execution process
+
+Initially, two processes are running:
+
+- SchedulerProcess - process the tasks and run using CeleryExecutor
+- WorkerProcess - observes the queue waiting for new tasks to appear
+- WorkerChildProcess - waits for new tasks
+
+Two databases are also available:
+
+- QueueBroker
+- ResultBackend
 
 Review comment:
   They are described in the section above.

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