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Type:
Bug
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Resolution: Done
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Priority:
Major - P3
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None
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Affects Version/s: 3.4.1
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Component/s: MongoDB 3.4
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Environment:node:11-alpine
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Replset events are no longer emitted after upgrade from 3.1.15 to 3.4.1 (and also 3.3.1). In particular, the "left" event.
// connect function this.mainClient = await MongoClient.connect(settings.db.url, options); this.mainDB = this.mainClient.db(settings.db.name); const onLeft = (event: any) => { logger.error(`Lost connection to mongodb replica: ${event}.`); }; this.mainClient.on("left", onLeft);
Options are:
{
useNewUrlParser: true,
useUnifiedTopology: true,
auth: { user: 'notrealuser', password: 'notrealpassword' },
replicaSet: 'ReplSet',
readPreference: 'primaryPreferred'
}
Running in the node11:alpine docker image.
Tested this by shutting down a single instance replset and bringing it back up on version 3.1.15 and 3.4.1 with identical code. In 3.1.15 the event fires but in 3.4.1 it does not.