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Hadoop Beginner's Guide

You're reading from   Hadoop Beginner's Guide Get your mountain of data under control with Hadoop. This guide requires no prior knowledge of the software or cloud services ‚Äì just a willingness to learn the basics from this practical step-by-step tutorial.

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Product type Paperback
Published in Feb 2013
Publisher Packt
ISBN-13 9781849517300
Length 398 pages
Edition 1st Edition
Tools
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Toc

Table of Contents (19) Chapters Close

Hadoop Beginner's Guide
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
1. What It's All About 2. Getting Hadoop Up and Running FREE CHAPTER 3. Understanding MapReduce 4. Developing MapReduce Programs 5. Advanced MapReduce Techniques 6. When Things Break 7. Keeping Things Running 8. A Relational View on Data with Hive 9. Working with Relational Databases 10. Data Collection with Flume 11. Where to Go Next Pop Quiz Answers Index

Time for action – adding timestamps


We mentioned earlier that there were mechanisms to have file data written in slightly more sophisticated ways. Let's do something very common and write our data into a directory with a dynamically-created timestamp.

  1. Create the following configuration file as agent5.conf:

    agent5.sources = netsource
    agent5.sinks = hdfssink
    agent5.channels = memorychannel
    
    agent5.sources.netsource.type = netcat
    agent5.sources.netsource.bind = localhost
    agent5.sources.netsource.port = 3000
    agent5.sources.netsource.interceptors = ts
    
    agent5.sources.netsource.interceptors.ts.type = org.apache.flume.interceptor.TimestampInterceptor$Builder
    
    agent5.sinks.hdfssink.type = hdfs
    agent5.sinks.hdfssink.hdfs.path = /flume-%Y-%m-%d
    agent5.sinks.hdfssink.hdfs.filePrefix = log-
    agent5.sinks.hdfssink.hdfs.rollInterval = 0
    agent5.sinks.hdfssink.hdfs.rollCount = 3
    agent5.sinks.hdfssink.hdfs.fileType = DataStream
    
    agent5.channels.memorychannel.type = memory
    agent5.channels.memorychannel.capacity...
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