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[kolla] How to recover MariaDB if there's a controller failed to boot?

Hi everyone,

We met an issue few days ago. When we launch Openstack cluster, we found
that there's a controller couldn't boot up caused by hardware failure, And
lost sync after left controllers booted into system.
In this case, Can I just mark down the failed controller hostname in
inventory file and
do mariadb_recovery? Any risk after do this after failure one back online?

Many thanks,
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