Book Image

Hadoop Beginner's Guide

Book Image

Hadoop Beginner's Guide

Overview of this book

Data is arriving faster than you can process it and the overall volumes keep growing at a rate that keeps you awake at night. Hadoop can help you tame the data beast. Effective use of Hadoop however requires a mixture of programming, design, and system administration skills."Hadoop Beginner's Guide" removes the mystery from Hadoop, presenting Hadoop and related technologies with a focus on building working systems and getting the job done, using cloud services to do so when it makes sense. From basic concepts and initial setup through developing applications and keeping the system running as the data grows, the book gives the understanding needed to effectively use Hadoop to solve real world problems.Starting with the basics of installing and configuring Hadoop, the book explains how to develop applications, maintain the system, and how to use additional products to integrate with other systems.While learning different ways to develop applications to run on Hadoop the book also covers tools such as Hive, Sqoop, and Flume that show how Hadoop can be integrated with relational databases and log collection.In addition to examples on Hadoop clusters on Ubuntu uses of cloud services such as Amazon, EC2 and Elastic MapReduce are covered.
Table of Contents (19 chapters)
Hadoop Beginner's Guide
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
Index

Time for action – multi level Flume networks


Let's put together a few pieces we touched on earlier and see how one Flume agent can use another as its sink.

  1. Create the following file as agent6.conf:

    agent6.sources = avrosource
    agent6.sinks = avrosink
    agent6.channels = memorychannel
    
    agent6.sources.avrosource.type = avro
    agent6.sources.avrosource.bind = localhost
    agent6.sources.avrosource.port = 2000
    agent6.sources.avrosource.threads = 5
    
    agent6.sinks.avrosink.type = avro
    agent6.sinks.avrosink.hostname = localhost
    agent6.sinks.avrosink.port = 4000
    
    agent6.channels.memorychannel.type = memory
    agent6.channels.memorychannel.capacity = 1000
    agent6.channels.memorychannel.transactionCapacity = 100
    
    agent6.sources.avrosource.channels = memorychannel
    agent6.sinks.avrosink.channel = memorychannel
  2. Start an agent configured as per the agent3.conf file created earlier, that is, with an Avro source and a file sink:

    $ flume-ng client –conf conf –conf-file agent3.conf agent3  
    
  3. In a second window, start another...