Go driver, can't connect to an uninitialized replica set

Working with Data Drivers
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2

Hi @yi_liu,

Per the Server Discovery and Monitoring specification, an uninitialized member of a replica set is represented via the RSGhost server type. Such servers are not considered selectable for operations, so attempting to execute a command will fail with a server selection error.

To work around this issue in the Go Driver, you can specify that you would like to create a direct connection to the node by either appending directConnection=true to the URI or setting the Direct option in ClientOptions:

uri := "mongodb://user:password@host/?directConnection=true"
client, err := mongo.Connect(ctx, options.Client().ApplyURI(uri))

// OR

uri := "mongodb://user:password@host"
opts := options.Client().ApplyURI(uri).SetDirect(true)
client, err := mongo.Connect(ctx, opts)

Note that this will connect only to that specific node, so if there are other members in the replica set, they will not be targetted for operations.

– Divjot

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