Merge branch 'innodb-snapshot-isolation' into 'master'

mariadb: Add switch for innodb_snapshot_isolation

See merge request !896

playbooks/aur.archlinux.org.yml

@@ -9,7 +9,7 @@
     - { role: promtail }
     - { role: certbot }
     - { role: nginx }
-    - { role: mariadb, mariadb_innodb_buffer_pool_size: '1G' }
+    - { role: mariadb, mariadb_innodb_buffer_pool_size: '1G', mariadb_innodb_disable_snapshot_isolation: true }
     - { role: sudo }
     - { role: valkey }
     - { role: uwsgi }

playbooks/bbs.archlinux.org.yml

@@ -7,7 +7,7 @@
     - { role: root_ssh }
     - { role: certbot }
     - { role: nginx }
-    - { role: mariadb, mariadb_query_cache_type: '0', mariadb_innodb_buffer_pool_size: '512M' }
+    - { role: mariadb, mariadb_query_cache_type: '0', mariadb_innodb_buffer_pool_size: '512M', mariadb_innodb_disable_snapshot_isolation: true }
     - { role: sudo }
     - { role: php_fpm, php_extensions: ['apcu', 'iconv', 'intl', 'mysqli'], zend_extensions: ['opcache'] }
     - { role: fluxbb }

roles/mariadb/templates/server.cnf.j2

@@ -51,6 +51,11 @@ innodb_thread_concurrency = {{ mariadb_innodb_thread_concurrency }}
 innodb_file_per_table
 {% endif %}
 
+{% if mariadb_innodb_disable_snapshot_isolation is defined and mariadb_innodb_disable_snapshot_isolation %}
+# changed to default from OFF to ON with 11.6.2 https://mariadb.com/kb/en/mariadb-11-6-2-release-notes/
+innodb_snapshot_isolation = OFF
+
+{% endif %}
 [mysqldump]
 quick
 max_allowed_packet = 16M