1{
2  "heartbeatFrequencyMS": 25000,
3  "topology_description": {
4    "type": "ReplicaSetNoPrimary",
5    "servers": [
6      {
7        "address": "a:27017",
8        "type": "RSSecondary",
9        "avg_rtt_ms": 5,
10        "lastUpdateTime": 0,
11        "maxWireVersion": 5,
12        "lastWrite": {
13          "lastWriteDate": {
14            "$numberLong": "125002"
15          }
16        },
17        "tags": {
18          "data_center": "tokyo"
19        }
20      },
21      {
22        "address": "b:27017",
23        "type": "RSSecondary",
24        "avg_rtt_ms": 5,
25        "lastUpdateTime": 0,
26        "maxWireVersion": 5,
27        "lastWrite": {
28          "lastWriteDate": {
29            "$numberLong": "2"
30          }
31        },
32        "tags": {
33          "data_center": "nyc"
34        }
35      },
36      {
37        "address": "c:27017",
38        "type": "RSSecondary",
39        "avg_rtt_ms": 5,
40        "lastUpdateTime": 0,
41        "maxWireVersion": 5,
42        "lastWrite": {
43          "lastWriteDate": {
44            "$numberLong": "1"
45          }
46        },
47        "tags": {
48          "data_center": "nyc"
49        }
50      },
51      {
52        "address": "d:27017",
53        "type": "RSSecondary",
54        "avg_rtt_ms": 5,
55        "lastUpdateTime": 0,
56        "maxWireVersion": 5,
57        "lastWrite": {
58          "lastWriteDate": {
59            "$numberLong": "2"
60          }
61        },
62        "tags": {
63          "data_center": "tokyo"
64        }
65      }
66    ]
67  },
68  "read_preference": {
69    "mode": "Secondary",
70    "maxStalenessSeconds": 150,
71    "tag_sets": [
72      {
73        "data_center": "nyc"
74      }
75    ]
76  },
77  "suitable_servers": [
78    {
79      "address": "b:27017",
80      "type": "RSSecondary",
81      "avg_rtt_ms": 5,
82      "lastUpdateTime": 0,
83      "maxWireVersion": 5,
84      "lastWrite": {
85        "lastWriteDate": {
86          "$numberLong": "2"
87        }
88      },
89      "tags": {
90        "data_center": "nyc"
91      }
92    }
93  ],
94  "in_latency_window": [
95    {
96      "address": "b:27017",
97      "type": "RSSecondary",
98      "avg_rtt_ms": 5,
99      "lastUpdateTime": 0,
100      "maxWireVersion": 5,
101      "lastWrite": {
102        "lastWriteDate": {
103          "$numberLong": "2"
104        }
105      },
106      "tags": {
107        "data_center": "nyc"
108      }
109    }
110  ]
111}
112