topology_description:
type: ReplicaSetNoPrimary
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
operation: read
read_preference:
mode: Primary
suitable_servers: []
in_latency_window: []