Why Does My MongoDB Replica Set Return a \'\'No write concern mode named \'majority\' found\' Error, and How Can I Fix It?

No Write Concern Mode 'Majority' Error in Replica Set Configuration

When attempting to insert an object into MongoDB using the 'mongo-go-driver' package, users may encounter the error: "'No write concern mode named 'majority`' found in replica set configuration'". This error indicates that the replica set does not support the 'majority' write concern mode, which ensures that data is written to a majority of nodes before acknowledging the write operation.

To resolve this issue, it is necessary to update the connection string to remove the write concern parameter:

mongodb+srv://user:[email protected]/DBname

The following lines in the code responsible for setting up the MongoDB connection illustrate where this modification should be made:

var DbConn *mongo.Client //*sql.DB //*mongo.Client

func SetupDB(conn_str string) {
    var err error
    DbConn, err = mongo.NewClient(options.Client().ApplyURI(conn_str))
    if err != nil {
        log.Fatal(err)
    }
    ctx, _ := context.WithTimeout(context.Background(), 10*time.Second)
    err = DbConn.Connect(ctx)
    if err != nil {
        log.Fatal(err)
    }
}

After updating the connection string, the write operation should succeed without the error.

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