I am updating production cluster from 0.90.2 to 0.94 . My table's size is about 20TB+ .
Scheduled update includes upgrading both hbase,hadoop version,
and I am also changing user with which I start up both hadoop and hbase cluster from user "A" to user "B".
It's production environment , so I wanted know what steps I should not miss regarding this upgrade.
Table is kinda big and I don't have backup cluster to backup my data.
I wanted to know will there be a data loss scenario if I rollback after having failed to upgrade. thanks.