-
Type:
Bug
-
Resolution: Fixed
-
Priority:
Major - P3
-
Affects Version/s: 3.6.3
-
Component/s: None
-
Labels:None
-
(copied to CRM)
-
Empty show more show less
I'm not sure if this would be a regression from 3.6.x or a bug that was fixed in 3.6.x however given the following MongoDB cluster (single node replica set running in docker) the test will succeed in 3.5 and fail in 3.6.
docker-compose.yml
version: "3" services: mongodb: image: mongo:4.4.1-bionic environment: MONGO_REPLICA_SET_NAME: rs0 expose: - 27017 ports: - "27017:27017" healthcheck: test: test $$(echo "rs.initiate().ok || rs.slaveOk().ok || rs.status().ok" | mongo --quiet) -eq 1 interval: 10s start_period: 30s entrypoint: [ "/usr/bin/mongod", "--bind_ip_all", "--replSet", "rs0" ]
index.js
const { MongoClient } = require('mongodb'); const url = "mongodb://127.0.0.1:27017/test?replSet=rs0'" const options = { useNewUrlParser: true, useUnifiedTopology: true }; console.log('connecting to', url); var client = new MongoClient(url, options); client.on('serverDescriptionChanged', function(event) { console.log('received serverDescriptionChanged'); console.log(JSON.stringify(event, null, 2)); }); client.on('serverHeartbeatStarted', function(event) { console.log('received serverHeartbeatStarted'); console.log(JSON.stringify(event, null, 2)); }); client.on('serverHeartbeatSucceeded', function(event) { console.log('received serverHeartbeatSucceeded'); console.log(JSON.stringify(event, null, 2)); }); client.on('serverHeartbeatFailed', function(event) { console.log('received serverHeartbeatFailed'); console.log(JSON.stringify(event, null, 2)); }); client.on('serverOpening', function(event) { console.log('received serverOpening'); console.log(JSON.stringify(event, null, 2)); }); client.on('serverClosed', function(event) { console.log('received serverClosed'); console.log(JSON.stringify(event, null, 2)); }); client.on('topologyOpening', function(event) { console.log('received topologyOpening'); console.log(JSON.stringify(event, null, 2)); }); client.on('topologyClosed', function(event) { console.log('received topologyClosed'); console.log(JSON.stringify(event, null, 2)); }); client.on('topologyDescriptionChanged', function(event) { console.log('received topologyDescriptionChanged'); console.log(JSON.stringify(event, null, 2)); }); client.connect() .then(() => { console.log('ok') }) .catch((err) => console.error('error', err));
To run the test:
docker-compose up -d npm install mongodb@3.5.10 --save && node index.js npm install mongodb@3.6.3 --save && node index.js
The test above shows the serverDescriptionChanged events differ, and as a result the serverOpening event is targeting an IP address (in 3.5.x) as opposed to a hostname (in 3.6.x)
// 3.5 Topology Events received serverOpening { "topologyId": 0, "address": "127.0.0.1:27017" } received serverHeartbeatStarted { "connectionId": "127.0.0.1:27017" } received serverHeartbeatSucceeded { "connectionId": "127.0.0.1:27017", "duration": 26, "reply": { "topologyVersion": { "processId": "5faaebc4119ee19f2d5dccf5", "counter": 6 }, "hosts": [ "mongodb:27017" ], "setName": "rs0", "setVersion": 1, "ismaster": true, "secondary": false, "primary": "mongodb:27017", "me": "mongodb:27017", "electionId": "7fffffff0000000000000002", "lastWrite": { "opTime": { "ts": "6893584559196078081", "t": 2 }, "lastWriteDate": "2020-11-10T19:48:50.000Z", "majorityOpTime": { "ts": "6893584559196078081", "t": 2 }, "majorityWriteDate": "2020-11-10T19:48:50.000Z" }, "maxBsonObjectSize": 16777216, "maxMessageSizeBytes": 48000000, "maxWriteBatchSize": 100000, "localTime": "2020-11-10T19:48:53.620Z", "logicalSessionTimeoutMinutes": 30, "connectionId": 81, "minWireVersion": 0, "maxWireVersion": 9, "readOnly": false, "ok": 1, "$clusterTime": { "clusterTime": "6893584559196078081", "signature": { "hash": { "type": "Buffer", "data": [ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 ] }, "keyId": 0 } }, "operationTime": "6893584559196078081" } } received serverDescriptionChanged { "topologyId": 0, "address": "127.0.0.1:27017", "previousDescription": { "address": "127.0.0.1:27017", "roundTripTime": -1, "lastUpdateTime": 1322597506, "lastWriteDate": null, "opTime": null, "type": "Unknown", "minWireVersion": 0, "maxWireVersion": 0, "hosts": [], "passives": [], "arbiters": [], "tags": [] }, "newDescription": { "address": "127.0.0.1:27017", "roundTripTime": 26, "lastUpdateTime": 1322597542, "lastWriteDate": "2020-11-10T19:48:50.000Z", "opTime": { "ts": "6893584559196078081", "t": 2 }, "type": "RSPrimary", "minWireVersion": 0, "maxWireVersion": 9, "maxBsonObjectSize": 16777216, "maxMessageSizeBytes": 48000000, "maxWriteBatchSize": 100000, "me": "mongodb:27017", "hosts": [ "mongodb:27017" ], "passives": [], "arbiters": [], "tags": [], "setName": "rs0", "setVersion": 1, "electionId": "7fffffff0000000000000002", "primary": "mongodb:27017", "logicalSessionTimeoutMinutes": 30, "$clusterTime": { "clusterTime": "6893584559196078081", "signature": { "hash": { "type": "Buffer", "data": [ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 ] }, "keyId": 0 } } } }
// 3.6 Topology Events received serverOpening { "topologyId": 0, "address": "127.0.0.1:27017" } received serverHeartbeatStarted { "connectionId": "127.0.0.1:27017" } received serverHeartbeatSucceeded { "connectionId": "127.0.0.1:27017", "duration": 30, "reply": { "topologyVersion": { "processId": "5faaebc4119ee19f2d5dccf5", "counter": 6 }, "hosts": [ "mongodb:27017" ], "setName": "rs0", "setVersion": 1, "ismaster": true, "secondary": false, "primary": "mongodb:27017", "me": "mongodb:27017", "electionId": "7fffffff0000000000000002", "lastWrite": { "opTime": { "ts": "6893584730994769921", "t": 2 }, "lastWriteDate": "2020-11-10T19:49:30.000Z", "majorityOpTime": { "ts": "6893584730994769921", "t": 2 }, "majorityWriteDate": "2020-11-10T19:49:30.000Z" }, "maxBsonObjectSize": 16777216, "maxMessageSizeBytes": 48000000, "maxWriteBatchSize": 100000, "localTime": "2020-11-10T19:49:39.876Z", "logicalSessionTimeoutMinutes": 30, "connectionId": 86, "minWireVersion": 0, "maxWireVersion": 9, "readOnly": false, "ok": 1, "$clusterTime": { "clusterTime": "6893584730994769921", "signature": { "hash": { "type": "Buffer", "data": [ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 ] }, "keyId": 0 } }, "operationTime": "6893584730994769921" } } received serverDescriptionChanged { "topologyId": 0, "address": "127.0.0.1:27017", "previousDescription": { "address": "127.0.0.1:27017", "roundTripTime": -1, "lastUpdateTime": 1322643760, "lastWriteDate": null, "opTime": null, "type": "Unknown", "minWireVersion": 0, "maxWireVersion": 0, "hosts": [], "passives": [], "arbiters": [], "tags": [] } }