# Attempt to select the secondary, except its tag doesn't match.
# Fall back to primary.
---
topology_description:
  type: ReplicaSetWithPrimary
  servers:
  - &1
    address: a:27017
    avg_rtt_ms: 5
    type: RSPrimary
    tags:
      data_center: nyc
  - &2
    address: b:27017
    avg_rtt_ms: 5
    type: RSSecondary
    tags:
      data_center: sf  # No match.
operation: read
read_preference:
  mode: SecondaryPreferred
  tag_sets:
  - data_center: nyc
suitable_servers:
- *1
in_latency_window:
- *1