With 7.0+ comes "unsafe mode" fail over.
It is mentionned inside our documentation:
In order that users do not have to abandon a cluster in which a majority of nodes have failed or are unreachable, hard failover can be performed in unsafe mode. Unsafe failovers override the consensus protocol; and may be performed even if a majority of nodes in the cluster cannot be contacted. No unsafe failover should be attempted without a full understanding of the consequences and requirements, which are listed immediately below.
As described above, in Consequences of Unsafe Failover, following unsafe failover, the failed-over nodes cannot be recovered; and will need to be entirely re-initialized, in order to be re-introduced into the cluster.
The consequences of unsafe failover in Couchbase Server Version 7.0+ are therefore significantly different from in previous versions: previously, the failed over nodes remained in the cluster, and could be recovered; but in 7.0+, they are removed from the cluster, are non-recoverable, and must be re-initialized before being added back to the cluster.
QUESTION: what do we mean EXACTLY saying following unsafe mode fail over, "failed over nodes must be re-initialized before being added back to the cluster" ?
Should the nodes be completely uninstall and re install?
I ask this question because I tested:
So I think it means uninstall + re install node but would like confirmation.
Can anybody confirm?