suggest metadata store with instant ADD COLUMN semantics

techdocsmith · Nov 7, 2023 · 76960d6 · 76960d6
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diff --git a/docs/design/metadata-storage.md b/docs/design/metadata-storage.md
@@ -44,7 +44,9 @@ See [Metadata storage configuration](../configuration/index.md#metadata-storage)
 
 ## Available metadata stores
 
-Druid supports Derby, MySQL, and PostgreSQL for storing metadata. 
+Druid supports Derby, MySQL, and PostgreSQL for storing metadata.
+
+To avoid issues with upgrades that require scehma changes to a large metadata table, chose a metadata store version that supports instant ADD COLUMN semantics.
 
 ### Derby
 

diff --git a/docs/development/extensions-core/mysql.md b/docs/development/extensions-core/mysql.md
@@ -61,6 +61,8 @@ Depending on the MariaDB client library version, the connector supports both `jd
 
 ## Setting up MySQL
 
+To avoid issues with upgrades that require scehma changes to a large metadata table, chose a MySQL version that supports instant ADD COLUMN semantics. For example, MySQL 8.
+
 1. Install MySQL
 
   Use your favorite package manager to install mysql, e.g.: