1topology_description:
2  type: ReplicaSetWithPrimary
3  servers:
4  - &1
5    address: b:27017
6    avg_rtt_ms: 5
7    type: RSSecondary
8    tags:
9      data_center: nyc
10  - &2
11    address: c:27017
12    avg_rtt_ms: 100
13    type: RSSecondary
14    tags:
15      data_center: nyc
16  - address: a:27017
17    avg_rtt_ms: 26
18    type: RSPrimary
19    tags:
20      data_center: nyc
21operation: read
22read_preference:
23  mode: Secondary
24  tag_sets:
25  - data_center: nyc
26suitable_servers:
27- *1
28- *2
29in_latency_window:
30- *1
31