I am looking at the replication functionality in HBase from the
perspective of failover/failback mechanisms, i.e., fail over to a
slave cluster in case the master (or primary) cluster fails, and then
reverting back to the original master when it is up.
By looking at the code, and replication page , I think the current
replication functionality supports replicating a healthy cluster to a
backup cluster (irrespective of any cluster size). This is not a exact
failover/failback process, but a backup and recovery tool.
Please correct me if I am wrong.