Book Image

Apache Mesos Cookbook

By : David Blomquist, Tomasz Janiszewski
Book Image

Apache Mesos Cookbook

By: David Blomquist, Tomasz Janiszewski

Overview of this book

Apache Mesos is open source cluster sharing and management software. Deploying and managing scalable applications in large-scale clustered environments can be difficult, but Apache Mesos makes it easier with efficient resource isolation and sharing across application frameworks. The goal of this book is to guide you through the practical implementation of the Mesos core along with a number of Mesos supported frameworks. You will begin by installing Mesos and then learn how to configure clusters and maintain them. You will also see how to deploy a cluster in a production environment with high availability using Zookeeper. Next, you will get to grips with using Mesos, Marathon, and Docker to build and deploy a PaaS. You will see how to schedule jobs with Chronos. We’ll demonstrate how to integrate Mesos with big data frameworks such as Spark, Hadoop, and Storm. Practical solutions backed with clear examples will also show you how to deploy elastic big data jobs. You will find out how to deploy a scalable continuous integration and delivery system on Mesos with Jenkins. Finally, you will configure and deploy a highly scalable distributed search engine with ElasticSearch. Throughout the course of this book, you will get to know tips and tricks along with best practices to follow when working with Mesos.
Table of Contents (15 chapters)
Title Page
About the Authors
About the Reviewer
Customer Feedback

Declining offers

In this recipe, we will handle offers by declining them so they can be presented to other frameworks.

How to do it...

So far, our framework has been acquiring resources, although it's not using them. This is because it gets offers but does not respond to them. To make offers free, we need to explicitly refuse them.

To refuse Offers, we need to handle the Offers event. We can do this by adding the following code in the event type switch:

case Event_OFFERS:
         log.Printf("Handle offers returns: %v", handleOffers(event.Offers))

Of course, we need to implement the handleOffers() function. But before that, we should prepare the call() function, which will be useful for implementation. This function will be used to send messages to Mesos:

func call(message *Call) error {
        message.FrameworkId = frameworkInfo.Id
        body, _ := marshaller.MarshalToString(message)
        req, _ := http.NewRequest("POST", schedulerApiUrl, bytes.NewBuffer([]byte(body)))