TypeError on server available with useUnifiedTopology: true

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    • Type: Bug
    • Resolution: Fixed
    • Priority: Major - P3
    • 3.5.5
    • Affects Version/s: 3.5.4
    • Component/s: None
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      I was testing with the new topology mechanism and encountered an error.

      The idea is to execute the query if the server is available or throw an error after a timeout if not available.

      Here is the code i used :

      const MongoClient = require("mongodb");
const main = async () => {
  const client = await MongoClient("mongodb://127.0.0.1", { useUnifiedTopology: true });
  const coll = client.db("test").collection("test");
  setInterval(async () => {    try {      console.log(await coll.findOne({}));    } catch (err) {        console.log(err);    }  }, 1000);};
main();

      And the output :

      // [server is up, queries are running fine]null
null
null
null
null
null
null
null
null
null
null
null// [stopped the server, coll.findOne is pending with serverSelectionTimeoutMS]// [started back up the server before the serverSelectionTimeoutMS expired]
/Users/hay/Desktop/nodejs-mongo-driver/node_modules/mongodb/lib/core/sdam/topology.js:1001
    if (waitQueueMember[kCancelled]) {
                       ^

TypeError: Cannot read property 'Symbol(cancelled)' of undefined
    at processWaitQueue (/Users/hay/Desktop/nodejs-mongo-driver/node_modules/mongodb/lib/core/sdam/topology.js:1001:24)
    at NativeTopology.serverUpdateHandler (/Users/hay/Desktop/nodejs-mongo-driver/node_modules/mongodb/lib/core/sdam/topology.js:550:7)
    at Server.emit (events.js:321:20)
    at Monitor.<anonymous> (/Users/hay/Desktop/nodejs-mongo-driver/node_modules/mongodb/lib/core/sdam/server.js:147:12)
    at Monitor.emit (events.js:333:22)
    at successHandler (/Users/hay/Desktop/nodejs-mongo-driver/node_modules/mongodb/lib/core/sdam/monitor.js:154:13)
    at /Users/hay/Desktop/nodejs-mongo-driver/node_modules/mongodb/lib/core/sdam/monitor.js:196:5
    at callback (/Users/hay/Desktop/nodejs-mongo-driver/node_modules/mongodb/lib/core/connection/connect.js:97:5)
    at /Users/hay/Desktop/nodejs-mongo-driver/node_modules/mongodb/lib/core/connection/connect.js:169:5
    at /Users/hay/Desktop/nodejs-mongo-driver/node_modules/mongodb/lib/core/connection/connect.js:334:7

            Assignee:
            Matt Broadstone
            Reporter:
            Hugo Alamercery
            None
            Votes:
            2 Vote for this issue
            Watchers:
            4 Start watching this issue

              Created:
              Updated:
              Resolved: