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 – writing network traffic onto HDFS


This discussion of Flume in a book about Hadoop hasn't actually used Hadoop at all so far. Let's remedy that by writing data onto HDFS via Flume.

  1. Create the following file as agent4.conf within the Flume working directory:

    agent4.sources = netsource
    agent4.sinks = hdfssink
    agent4.channels = memorychannel
    
    agent4.sources.netsource.type = netcat
    agent4.sources.netsource.bind = localhost
    agent4.sources.netsource.port = 3000
    
    agent4.sinks.hdfssink.type = hdfs
    agent4.sinks.hdfssink.hdfs.path = /flume
    agent4.sinks.hdfssink.hdfs.filePrefix = log
    agent4.sinks.hdfssink.hdfs.rollInterval = 0
    agent4.sinks.hdfssink.hdfs.rollCount = 3
    agent4.sinks.hdfssink.hdfs.fileType = DataStream
    
    agent4.channels.memorychannel.type = memory
    agent4.channels.memorychannel.capacity = 1000
    agent4.channels.memorychannel.transactionCapacity = 100
    
    agent4.sources.netsource.channels = memorychannel
    agent4.sinks.hdfssink.channel = memorychannel
  2. Start the agent:

    $ flume-ng agent...