openstack-ansible/releasenotes/notes/mariadb-rolling-upgrades-32...

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---
upgrade:
- During upgrades, container and service restarts for the mariadb/galera
cluster were being triggered multiple times and causing the cluster to
become unstable and often unrecoverable. This situation has been improved
immensely, and we now have tight control such that restarts of the galera
containers only need to happen once, and are done so in a controlled,
predictable and repeatable way.