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# Primary's lastWriteDate is used normally with SecondaryPreferred and tags.
---
heartbeatFrequencyMS: 25000 # 25 seconds.
topology_description:
type: ReplicaSetWithPrimary
servers:
- &1
address: a:27017
type: RSPrimary
avg_rtt_ms: 5
lastUpdateTime: 0
maxWireVersion: 5
lastWrite: {lastWriteDate: {$numberLong: "125002"}}
- &2
address: b:27017
type: RSSecondary
avg_rtt_ms: 5
lastUpdateTime: 0
maxWireVersion: 5
lastWrite: {lastWriteDate: {$numberLong: "2"}} # 125 sec stale + 25 sec heartbeat <= 150 sec maxStaleness.
tags:
data_center: nyc
- &3
address: c:27017
type: RSSecondary
avg_rtt_ms: 50 # Too far.
lastUpdateTime: 1
maxWireVersion: 5
lastWrite: {lastWriteDate: {$numberLong: "1000001"}} # Not used in estimate since we have a primary.
tags:
data_center: nyc
- &4
address: d:27017
type: RSSecondary
avg_rtt_ms: 5
lastUpdateTime: 0
maxWireVersion: 5
lastWrite: {lastWriteDate: {$numberLong: "1"}} # Too stale.
tags:
data_center: nyc
- &5
address: e:27017
type: RSSecondary
avg_rtt_ms: 5
lastUpdateTime: 0
maxWireVersion: 5
lastWrite: {lastWriteDate: {$numberLong: "2"}}
tags:
data_center: tokyo # No match.
read_preference:
mode: SecondaryPreferred
maxStalenessSeconds: 150
tag_sets:
- data_center: nyc
suitable_servers:
- *2
- *3
in_latency_window:
- *2
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