Hands-On Software Engineering with Golang

Instantiating and operating master nodes

As you probably guessed, the Master type would encapsulate the implementation details for creating and operating a master node. Let's take a quick look into its constructor:

func NewMaster(cfg MasterConfig) (*Master, error) {
    if err := cfg.Validate(); err != nil {
        return nil, xerrors.Errorf("master config validation failed: %w", err)
    }
    return &Master{
        cfg:        cfg,
        workerPool: newWorkerPool(),
    }, nil
}

The constructor expects a MasterConfig object as an argument that defines the following:

• It defines the address where the master node will be listening for incoming connections.
• It defines the job.Runner instance for interfacing with the user-defined graph algorithm.
• It defines Serializer for marshaling ...