...
1# Fallback to secondary if no primary.
2---
3heartbeatFrequencyMS: 25000 # 25 seconds.
4topology_description:
5 type: ReplicaSetNoPrimary
6 servers:
7 - &1
8 address: a:27017
9 type: RSSecondary
10 avg_rtt_ms: 5
11 lastUpdateTime: 0
12 maxWireVersion: 6
13 lastWrite: {lastWriteDate: {$numberLong: "1000001"}}
14 - &2
15 address: b:27017
16 type: RSSecondary
17 avg_rtt_ms: 5
18 lastUpdateTime: 0
19 maxWireVersion: 6
20 lastWrite: {lastWriteDate: {$numberLong: "1"}} # Very stale.
21read_preference:
22 mode: PrimaryPreferred
23 maxStalenessSeconds: 90
24suitable_servers:
25- *1
26in_latency_window:
27- *1
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