Google Cloud Spanner Instance Administration v1 API - Enum ReplicaInfo.Types.ReplicaType (4.1.0)

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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.

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.

Not specified.

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.