dreagan dreagan - 2 months ago 30
Node.js Question

mongoError: Topology was destroyed

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


Answer

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"

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