ReplicaType(value)Indicates the type of replica. See the replica types
documentation <https://cloud.google.com/spanner/docs/replication#replica_types>__
for more details.
Values: TYPE_UNSPECIFIED (0): Not specified. READ_WRITE (1): Read-write replicas support both reads and writes. These replicas:
- Maintain a full copy of your data.
- Serve reads.
- Can vote whether to commit a write.
- Participate in leadership election.
- Are eligible to become a leader.
READ_ONLY (2):
Read-only replicas only support reads (not writes).
Read-only replicas:
- Maintain a full copy of your data.
- Serve reads.
- Do not participate in voting to commit writes.
- Are not eligible to become a leader.
WITNESS (3):
Witness replicas don't support reads but do participate in
voting to commit writes. Witness replicas:
- Do not maintain a full copy of data.
- Do not serve reads.
- Vote whether to commit writes.
- Participate in leader election but are not eligible to
become leader.