Book Image

Distributed Computing with Go

By : V.N. Nikhil Anurag
Book Image

Distributed Computing with Go

By: V.N. Nikhil Anurag

Overview of this book

Distributed Computing with Go gives developers with a good idea how basic Go development works the tools to fulfill the true potential of Golang development in a world of concurrent web and cloud applications. Nikhil starts out by setting up a professional Go development environment. Then you’ll learn the basic concepts and practices of Golang concurrent and parallel development. You’ll find out in the new few chapters how to balance resources and data with REST and standard web approaches while keeping concurrency in mind. Most Go applications these days will run in a data center or on the cloud, which is a condition upon which the next chapter depends. There, you’ll expand your skills considerably by writing a distributed document indexing system during the next two chapters. This system has to balance a large corpus of documents with considerable analytical demands. Another use case is the way in which a web application written in Go can be consciously redesigned to take distributed features into account. The chapter is rather interesting for Go developers who have to migrate existing Go applications to computationally and memory-intensive environments. The final chapter relates to the rather onerous task of testing parallel and distributed applications, something that is not usually taught in standard computer science curricula.
Table of Contents (11 chapters)

Multiplexing channels

Multiplexing describes the methodology where we use a single resource to act upon multiple signals or actions. This method is used extensively in telecommunications and computer networks. We might find ourselves in a situation where we have multiple types of tasks that we want to execute. However, they can only be executed in mutual exclusion, or they need to work on a shared resource. For this, we make use of a pattern in Go known as channels multiplexing. Before we dive into how to actually multiplex channels, let's try to implement it on our own.

Imagine that we have a set of channels and we want to act on them as soon as data is sent over a channel. Here's a naïve approach on how we want to do this:

// naiveMultiplexing.go 
package main 
import "fmt" 
func main() { 
    channels := [5](chan int){ 
        make(chan int), ...