[GitHub] [airflow] milton0825 commented on a change in pull request #4898: [AIRFLOW-XXXX] how to setup simple test env with mysql

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milton0825 commented on a change in pull request #4898: [AIRFLOW-XXXX] how to setup simple test env with mysql
URL: https://github.com/apache/airflow/pull/4898#discussion_r272435051
 
 

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 File path: docs/howto/setup-test-environment-mysql.rst
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+..  Licensed to the Apache Software Foundation (ASF) under one
+    or more contributor license agreements.  See the NOTICE file
+    distributed with this work for additional information
+    regarding copyright ownership.  The ASF licenses this file
+    to you under the Apache License, Version 2.0 (the
+    "License"); you may not use this file except in compliance
+    with the License.  You may obtain a copy of the License at
+
+..    http://www.apache.org/licenses/LICENSE-2.0
+
+..  Unless required by applicable law or agreed to in writing,
+    software distributed under the License is distributed on an
+    "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+    KIND, either express or implied.  See the License for the
+    specific language governing permissions and limitations
+    under the License.
+
+Setup Test Environment using MySQL
+==================================
+
+By default, Airflow uses SQLite as database backend
+and ``SequentialExecutor`` to execute tasks as SQLite
+does not support multiple connections. Since
+``SequentialExecutor`` runs one instance at a time,
+some parallel execution logic will not be exercised
+in this default setup.
+
+To test out the parallel execution setup, we can use
+MySQL as database backend and ``LocalExecutor`` as
+the executor. Checkout the following setups to launch
+a MySQL database container:
+
+.. code-block:: bash
+
+  # Launch MySQL docker container
+  docker-compose -f scripts/ci/docker-compose.yml run -p3306:3306 mysql
+
+  # Open airflow.cfg and add the following:
+  # sql_alchemy_conn = mysql://root@127.0.0.1:3306/airflow
+  # executor = LocalExecutor
+  vim $AIRFLOW_HOME/airflow.cfg
 
 Review comment:
   fixed.

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