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Is there a problem with MySQL InnoDB cluster?
WARNING: User ‘mysql_innodb_cluster_622884765’@’%’ already existed at instance ‘pdb1-mod:3306’. It will be deleted and created again with a new password. ERROR: Unable to start Group Replication for instance ‘ddb-mod:3306’. Please check the MySQL server error log for more information.
Why is MySQL not rejoined to the cluster?
If the UUID changed after the instance had left the cluster, for example because you used MySQL Enterprise Backup to restore from a backup, then the instance could not be rejoined to the cluster. Now, if the cluster encounters this situation, it checks the metadata to see if the instance can be identified using its host and port.
When to use incremental distributed state recovery in InnoDB?
The incremental distributed state recovery may be safely used if you are sure all updates ever executed in the cluster were done with GTIDs enabled, there are no purged transactions and the new instance contains the same GTID set as the cluster or a subset of it. To use this method by default, set the ‘recoveryMethod’ option to ‘incremental’.
Why is MySQL Cluster Replication failed to start?
Cluster.addInstance: Group Replication failed to start: MySQL Error 3092 (HY000): The server is not configured properly to be an active member of the group. Please see more details on error log.
How to persist configuration changes in MySQL Cluster?
Then issue dba.configureInstance ( instance) , where instance is the connection information to the local instance, to persist any changes made to the local instance’s option file. Repeat this process for each instance in the cluster which does not support persisting configuration changes automatically.
How to reboot MySQL Cluster in interactive mode?
Assuming you are running MySQL Shell in interactive mode, a wizard is run that checks which instances of the cluster are currently reachable and asks if you want to rejoin any discovered instances to the rebooted cluster.
https://www.youtube.com/watch?v=8JqJpVN3XqY