mongoError Topology was destroyed

Question

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

User · Answer

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

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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  gt  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        lt --------------------------------THIS LINE

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I solved this issue by     ensuring mongo is running restarting my server

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Using mongoose here  but you could do a similar check without it export async function clearDatabase       if  mongoose connection readyState     mongoose connection states disconnected        return Promise resolve         return mongoose connection db dropDatabase      My use case was just tests throwing errors  so if we ve disconnected  I don t run operations

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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 loggerLevel   info  in the options

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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

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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   gt  mongoose model model  ensureIndexes       await mongoose disconnect

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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

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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    x000D   x000D  const dns   require  dns    x000D   x000D  var dnsTimer   setInterval      gt    x000D   dns lookup  mongo-0 mongo    err  address  family    gt    x000D    if  err    x000D     console log  DNS LOOKUP ERR   err code   err code   err   x000D      else   x000D     console log  DNS LOOKUP   j family  IPv s   address  family   x000D     clearTimeout dnsTimer   x000D     mongoose connect mongoURL  db options   x000D      x000D       x000D     3000   x000D   x000D   x000D  var db   mongoose connection  x000D  var db options     x000D   autoReconnect true  x000D   x000D   poolSize  20  x000D   socketTimeoutMS  480000  x000D   keepAlive  300000  x000D   x000D   keepAliveInitialDelay   300000  x000D   connectTimeoutMS  30000  x000D   reconnectTries  Number MAX VALUE  x000D   reconnectInterval  1000  x000D   useNewUrlParser  true x000D     x000D   x000D   x000D     the numbers in db options are arbitrary found on stackoverflow and similar like sites

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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

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I got this problem recently  Here what I do   Restart MongoDb  sudo service mongod restart Restart My NodeJS APP  I use pm2 to handle this pm2 restart  your-app-id   To get ID use pm2 list

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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    gt        if err            console error  Error while connecting   err

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Here what I did  It works fine  Issue was gone after adding below options   const dbUrl    mongodb   localhost 27017 sampledb   const options      useMongoClient  true  keepAlive  1  connectTimeoutMS  30000  reconnectTries  30  reconnectInterval  5000  useNewUrlParser  true   mongoose connect dbUrl options  function    error       if  error        console log  mongoerror   error       else       console log  connected

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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                        connection options documentation

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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 gt mongod   I was able to create a database after running that command   Hope it helps

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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    amp  amp  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

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You need to restart mongo to solve the topology error  then just change some options of mongoose or mongoclient to overcome this problem   var mongoOptions         useMongoClient  true      keepAlive  1      connectTimeoutMS  30000      reconnectTries  Number MAX VALUE      reconnectInterval  5000      useNewUrlParser  true    mongoose connect mongoDevString mongoOptions

[node.js] mongoError: Topology was destroyed

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