anitakar commented on a change in pull request #7570: [AIRFLOW-6946] Switch to
MySQL 5.7 in 2.0 as base
URL: https://github.com/apache/airflow/pull/7570#discussion_r389400185
##########
File path: airflow/config_templates/default_airflow.cfg
##########
@@ -59,6 +59,12 @@ sql_alchemy_conn = sqlite:///{AIRFLOW_HOME}/airflow.db
# The encoding for the databases
sql_engine_encoding = utf-8
+# Collation for `dag_id`, `task_id`, `key` columns in case they have different
encoding.
+# This is particularly useful in case of mysql with utf8mb4 encoding because
+# primary keys for XCom table has too big size and
`sql_engine_collation_for_ids` should
+# be set to `utf8mb3_general_ci`
+# sql_engine_collation_for_ids =
Review comment:
Thanks for the answer. If tests fail already without this change this is all
we need.
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