1topology_description:
2  type: Sharded
3  servers:
4  - &1
5    address: g:27017
6    avg_rtt_ms: 5
7    type: Mongos
8  - &2
9    address: h:27017
10    avg_rtt_ms: 35
11    type: Mongos
12operation: write
13read_preference:
14  mode: Secondary
15  tag_sets:
16  - data_center: nyc
17suitable_servers:
18- *1
19- *2
20in_latency_window:
21- *1
22