I have a REST service built in node.js with Restify and Mongoose and a mongoDB with a collection with about 30.000 regular sized documents. I have my node service running through pmx and pm2.
Yesterday, suddenly, node started crapping out errors with the message "MongoError: Topology was destroyed", nothing more. I have no idea what is meant by this and what could have possibly triggered this. there is also not much to be found when google-searching this. So I thought I'd ask here.
After restarting the node service today, the errors stopped coming in. I also have one of these running in production and it scares me that this could happen at any given time to a pretty crucial part of the setup running there...
I'm using the following versions of the mentioned packages:
- mongoose: 4.0.3
- restify: 3.0.3
- node: 0.10.25
It seems to mean your node server's connection to your MongoDB instance was interrupted while it was trying to write to it.
Take a look at the Mongo source code that generates that error
Mongos.prototype.insert = function(ns, ops, options, callback) {
if(typeof options == 'function') callback = options, options = {};
if(this.s.state == DESTROYED) return callback(new MongoError(f('topology was destroyed')));
// Topology is not connected, save the call in the provided store to be
// Executed at some point when the handler deems it's reconnected
if(!this.isConnected() && this.s.disconnectHandler != null) {
callback = bindToCurrentDomain(callback);
return this.s.disconnectHandler.add('insert', ns, ops, options, callback);
}
executeWriteOperation(this.s, 'insert', ns, ops, options, callback);
}
This does not appear to be related to the Sails issue cited in the comments, as no upgrades were installed to precipitate the crash or the "fix"
I know that Jason's answer was accepted, but I had the same problem with Mongoose and found that the service hosting my database recommended to apply the following settings in order to keep Mongodb's connection alive in production:
var options = {
server: { socketOptions: { keepAlive: 1, connectTimeoutMS: 30000 } },
replset: { socketOptions: { keepAlive: 1, connectTimeoutMS: 30000 } }
};
mongoose.connect(secrets.db, options);
I hope that this reply may help other people having "Topology was destroyed" errors.
This error is due to mongo driver dropping the connection for any reason (server was down for example).
By default mongoose will try to reconnect for 30 seconds then stop retrying and throw errors forever until restarted.
You can change this by editing these 2 fields in the connection options
mongoose.connect(uri,
{ server: {
// sets how many times to try reconnecting
reconnectTries: Number.MAX_VALUE,
// sets the delay between every retry (milliseconds)
reconnectInterval: 1000
}
}
);
In my case, this error was caused by a db.close(); out of a 'await' section inside of 'async'
MongoClient.connect(url, {poolSize: 10, reconnectTries: Number.MAX_VALUE, reconnectInterval: 1000}, function(err, db) {
// Validate the connection to Mongo
assert.equal(null, err);
// Query the SQL table
querySQL()
.then(function (result) {
console.log('Print results SQL');
console.log(result);
if(result.length > 0){
processArray(db, result)
.then(function (result) {
console.log('Res');
console.log(result);
})
.catch(function (err) {
console.log('Err');
console.log(err);
})
} else {
console.log('Nothing to show in MySQL');
}
})
.catch(function (err) {
console.log(err);
});
db.close(); // <--------------------------------THIS LINE
});
Just a minor addition to Gaafar's answer, it gave me a deprecation warning. Instead of on the server object, like this:
MongoClient.connect(MONGO_URL, {
server: {
reconnectTries: Number.MAX_VALUE,
reconnectInterval: 1000
}
});
It can go on the top level object. Basically, just take it out of the server object and put it in the options object like this:
MongoClient.connect(MONGO_URL, {
reconnectTries: Number.MAX_VALUE,
reconnectInterval: 1000
});
"Topology was destroyed" might be caused by mongoose disconnecting before mongo document indexes are created, per this comment
In order to make sure all models have their indexes built before disconnecting, you can:
await Promise.all(mongoose.modelNames().map(model => mongoose.model(model).ensureIndexes()));
await mongoose.disconnect();
I alse had the same error. Finally, I found that I have some error on my code. I use load balance for two nodejs server, but I just update the code of one server.
I change my mongod server from standalone to replication, but I forget to do the corresponding update for the connection string, so I met this error.
standalone connection string:
mongodb://server-1:27017/mydb
replication connection string:
mongodb://server-1:27017,server-2:27017,server-3:27017/mydb?replicaSet=myReplSet
details here：[mongo doc for connection string]
I met this in kubernetes/minikube + nodejs + mongoose environment. The problem was that DNS service was up with a kind of latency. Checking DNS is ready solved my problem.
const dns = require('dns');
var dnsTimer = setInterval(() => {
dns.lookup('mongo-0.mongo', (err, address, family) => {
if (err) {
console.log('DNS LOOKUP ERR', err.code ? err.code : err);
} else {
console.log('DNS LOOKUP: %j family: IPv%s', address, family);
clearTimeout(dnsTimer);
mongoose.connect(mongoURL, db_options);
}
});
}, 3000);
var db = mongoose.connection;
var db_options = {
autoReconnect:true,
poolSize: 20,
socketTimeoutMS: 480000,
keepAlive: 300000,
keepAliveInitialDelay : 300000,
connectTimeoutMS: 30000,
reconnectTries: Number.MAX_VALUE,
reconnectInterval: 1000,
useNewUrlParser: true
};(the numbers in db_options are arbitrary found on stackoverflow and similar like sites)
I got this error, while I was creating a new database on my MongoDb Compass Community. The issue was with my Mongod, it was not running. So as a fix, I had to run the Mongod command as preceding.
C:\Program Files\MongoDB\Server\3.6\bin>mongod
I was able to create a database after running that command.
Hope it helps.
In my case, this error was caused by an identical server instance already running background.
The weird thing is when I started my server without notice there's one running already, the console didn't show anything like 'something is using port xxx'. I could even upload something to the server. So, it took me quite long to locate this problem.
What's more, after closing all the applications I can imagine, I still could not find the process which is using this port in my Mac's activity monitor. I have to use lsof to trace. The culprit was not surprising - it's a node process. However, with the PID shown in the terminal, I found the port number in the monitor is different from the one used by my server.
All in all, kill all the node processes may solve this problem directly.
Sebastian comment on Adrien's answer needs more attention it helped me but it being a comment might be ignore sometime so here's a solution:
var options = { useMongoClient: true, keepAlive: 1, connectTimeoutMS: 30000, reconnectTries: 30, reconnectInterval: 5000 }
mongoose.connect(config.mongoConnectionString, options, (err) => {
if(err) {
console.error("Error while connecting", err);
}
});
I was struggling with this for some time - As you can see from other answers, the issue can be very different.
The easiest way to find out whats causing is this is to turn on loggingLevel: info in the options
I solved this issue by:
- ensuring mongo is running
- restarting my server
You need to go to the "Connect" menu and click on the "Connect to ..." submenu. This will open a new MongoDB Compass Community window, through which you can connect again.
来源：https://stackoverflow.com/questions/30909492/mongoerror-topology-was-destroyed