cell is the cell (or datacenter) the tablet is in
uid is a unique id for this tablet within the shard (this is the MySQL server id as well).
(Since version 0.6.0) Use toPMessage
(Since version 0.6.0) Use getField that accepts a ScalaPB descriptor and returns PValue
TabletAlias is a globally unique tablet identifier.
cell is the cell (or datacenter) the tablet is in
uid is a unique id for this tablet within the shard (this is the MySQL server id as well).