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Type:
Bug
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Resolution: Done
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Priority:
Major - P3
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Affects Version/s: 2.1.8
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Component/s: MongoDB 3.2
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Environment:using nodejs 5.7.1
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We're seeing lots of connection from a machine which is running 2.1.8. We're connecting to a replicaSet.
MongoClient
.connect(mongoUrl, {promiseLibrary: Promise})
.then(adminDb => {
adminDb.on('reconnect', () => console.log('reconnect', new Error().stack))
})
When the reconnect logs appear, we see 4 connections being made within a couple of milliseconds.
The stacktrace we're printing is not always the same:
at null.<anonymous> (/opt/myproject/src/mongodb/index.js:35:49)
at emitTwo (events.js:100:13)
at emit (events.js:185:7)
at listener (/opt/myproject/node_modules/mongodb/lib/db.js:1729:14)
at emitNone (events.js:80:13)
at emit (events.js:179:7)
at null.<anonymous> (/opt/myproject/node_modules/mongodb/lib/replset.js:200:10)
at emitOne (events.js:90:13)
at emit (events.js:182:7)
at State.update (/opt/myproject/node_modules/mongodb-core/lib/topologies/replset_state.js:471:20)
at /opt/myproject/node_modules/mongodb-core/lib/topologies/replset.js:1146:27
at commandCallback (/opt/myproject/node_modules/mongodb-core/lib/topologies/server.js:945:9)
at Callbacks.emit (/opt/myproject/node_modules/mongodb-core/lib/topologies/server.js:116:3)
at null.messageHandler (/opt/myproject/node_modules/mongodb-core/lib/topologies/server.js:288:23)
at Socket.<anonymous> (/opt/myproject/node_modules/mongodb-core/lib/connection/connection.js:320:20)
at emitOne (events.js:90:13)
at Socket.emit (events.js:182:7)
or
at null.<anonymous> (/opt/myproject/src/mongodb/index.js:35:49)
at emitTwo (events.js:100:13)
at emit (events.js:185:7)
at listener (/opt/myproject/node_modules/mongodb/lib/db.js:1729:14)
at emitNone (events.js:80:13)
at emit (events.js:179:7)
at null.<anonymous> (/opt/myproject/node_modules/mongodb/lib/replset.js:200:10)
at emitOne (events.js:90:13)
at emit (events.js:182:7)
at State.update (/opt/myproject/node_modules/mongodb-core/lib/topologies/replset_state.js:471:20)
at processNewServer (/opt/myproject/node_modules/mongodb-core/lib/topologies/replset.js:1311:27)
at null.<anonymous> (/opt/myproject/node_modules/mongodb-core/lib/topologies/replset.js:1364:46)
at g (events.js:273:16)
at emitOne (events.js:90:13)
at emit (events.js:182:7)
at /opt/myproject/node_modules/mongodb-core/lib/topologies/server.js:497:23
When I revert to 2.1.4, this is reconnecting doesn't happen. The mongodb primary's connections are stable again.