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: read 13read_preference: 14 mode: SecondaryPreferred 15 tag_sets: 16 - data_center: nyc 17suitable_servers: 18- *1 19- *2 20in_latency_window: 21- *1