itayB commented on code in PR #25938:
URL: https://github.com/apache/airflow/pull/25938#discussion_r954984566
##########
docs/apache-airflow/installation/upgrading.rst:
##########
@@ -55,16 +67,143 @@ Sample usage:
``airflow db upgrade --revision-range "e959f08ac86c:142555e44c17"``
-Migration best practices
-========================
+Handling migration problems
+===========================
+
+
+Wrong Encoding in MySQL database
+................................
+
+If you are using old Airflow 1.10 as a database created initially either
manually or with previous version of MySQL,
+depending on the original character set of your database, you might have
problems with migrating to a newer
+version of Airflow and your migration might fail with strange errors ("key
size too big", "missing indexes" etc).
+The next chapter describes how to fix the problem manually.
Review Comment:
@potiuk until a migration tool is provided 😄, do you have any
recommendations of existing tools for migration? I am currently trying
[pgloader](https://github.com/dimitri/pgloader) and I wonder if that's a good
choice (I want to migrate from MySql 8 to Postgres 13).
##########
docs/apache-airflow/installation/upgrading.rst:
##########
@@ -55,16 +67,143 @@ Sample usage:
``airflow db upgrade --revision-range "e959f08ac86c:142555e44c17"``
-Migration best practices
-========================
+Handling migration problems
+===========================
+
+
+Wrong Encoding in MySQL database
+................................
+
+If you are using old Airflow 1.10 as a database created initially either
manually or with previous version of MySQL,
+depending on the original character set of your database, you might have
problems with migrating to a newer
+version of Airflow and your migration might fail with strange errors ("key
size too big", "missing indexes" etc).
+The next chapter describes how to fix the problem manually.
Review Comment:
@potiuk until a migration tool is provided 😄, do you have any
recommendations for existing tools for migration? I am currently trying
[pgloader](https://github.com/dimitri/pgloader) and I wonder if that's a good
choice (I want to migrate from MySql 8 to Postgres 13).
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