If there are only 3 backends and replication num is 3. If one replica of a tablet is bad, there is no 4th backend for tablet repair. So we need to delete a bad replica first to make room for new replica.
If there are only 3 backends and replication num is 3. If one replica of a tablet is bad, there is no 4th backend for tablet repair. So we need to delete a bad replica first to make room for new replica.