topology_description:
  type: ReplicaSetWithPrimary
  servers:
  - address: b:27017
    avg_rtt_ms: 5
    type: RSSecondary
    tags:
      data_center: nyc
  - address: c:27017
    avg_rtt_ms: 100
    type: RSSecondary
    tags:
      data_center: nyc
  - &1
    address: a:27017
    avg_rtt_ms: 26
    type: RSPrimary
    tags:
      data_center: nyc
operation: read
read_preference:
  mode: PrimaryPreferred
  tag_sets:
  - {}
suitable_servers:
- *1
in_latency_window:
- *1