How to Resolve \'No write concern mode named \'majority\' found\' Error in MongoDB?

Write Concern Error in MongoDB

When inserting data into MongoDB using the majority write concern, it is possible to encounter the error:

No write concern mode named 'majority`' found in replica set configuration

This error occurs because the replica set configuration does not include a write concern mode named majority.

Resolving the Error

To resolve this error, add the majority write concern mode to the replica set configuration. The majority write concern ensures that data is written to a majority of the replica set members before acknowledging the write.

Example Connection String

The following connection string includes the majority write concern:

mongodb+srv://user:[email protected]/DBname?retryWrites=true&w=majority

Modify Database Connection

Update the database connection setup function to add the majority write concern:

import (
    "context"
    "time"
    
    "go.mongodb.org/mongo-driver/mongo"
)

var DbConn *mongo.Client

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

Updating Request

Ensure that the InsertOne request is using the updated database connection:

ctx, cancel := context.WithTimeout(context.Background(), 3*time.Second)
defer cancel()

result, err := DbConn.Database(dbName).Collection(collectionName).InsertOne(ctx, b)

After making these changes, rerun the application and the error should be resolved.

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