# maxStalenessSeconds is applied before tag sets. With tag sets
# [{data_center: nyc}, {data_center: tokyo}], if the only secondary in NYC is
# stale then use Tokyo.
---
heartbeatFrequencyMS: 25000 # 25 seconds.
topology_description:
type: ReplicaSetWithPrimary
servers:
- &1
address: a:27017
type: RSPrimary
avg_rtt_ms: 5
lastUpdateTime: 0
lastWrite: {lastWriteDate: {$numberLong: "125002"}}
maxWireVersion: 5
- &2
address: b:27017
type: RSSecondary
avg_rtt_ms: 5
lastUpdateTime: 0
lastWrite: {lastWriteDate: {$numberLong: "2"}}
maxWireVersion: 5
tags:
data_center: tokyo
- &3
address: c:27017
type: RSSecondary
avg_rtt_ms: 5
lastUpdateTime: 0
lastWrite: {lastWriteDate: {$numberLong: "1"}} # Too stale.
maxWireVersion: 5
tags:
data_center: nyc
read_preference:
mode: SecondaryPreferred
maxStalenessSeconds: 150
tag_sets:
- data_center: nyc
- data_center: tokyo
suitable_servers:
- *2
in_latency_window:
- *2