1# Latest secondary's lastWriteDate is used normally with read preference tags.
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: {$numberLong: "125002"}}
14 tags:
15 data_center: tokyo # No match, but its lastWriteDate is used in estimate.
16 - &2
17 address: b:27017
18 type: RSSecondary
19 avg_rtt_ms: 5
20 lastUpdateTime: 0
21 maxWireVersion: 6
22 lastWrite: {lastWriteDate: {$numberLong: "2"}} # 125 sec stale + 25 sec heartbeat <= 150 sec maxStaleness.
23 tags:
24 data_center: nyc
25 - &3
26 address: c:27017
27 type: RSSecondary
28 avg_rtt_ms: 5
29 lastUpdateTime: 0
30 maxWireVersion: 6
31 lastWrite: {lastWriteDate: {$numberLong: "1"}} # Too stale.
32 tags:
33 data_center: nyc
34 - &4
35 address: d:27017
36 type: RSSecondary
37 avg_rtt_ms: 5
38 lastUpdateTime: 0
39 maxWireVersion: 6
40 lastWrite: {lastWriteDate: {$numberLong: "2"}}
41 tags:
42 data_center: tokyo # No match.
43read_preference:
44 mode: Secondary
45 maxStalenessSeconds: 150
46 tag_sets:
47 - data_center: nyc
48suitable_servers:
49- *2
50in_latency_window:
51- *2
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