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 – killing a DataNode process


Firstly, we'll kill a DataNode. Recall that the DataNode process runs on each host in the HDFS cluster and is responsible for the management of blocks within the HDFS filesystem. Because Hadoop, by default, uses a replication factor of 3 for blocks, we should expect a single DataNode failure to have no direct impact on availability, rather it will result in some blocks temporarily falling below the replication threshold. Execute the following steps to kill a DataNode process:

  1. Firstly, check on the original status of the cluster and check whether everything is healthy. We'll use the dfsadmin command for this:

    $ Hadoop dfsadmin -report
    Configured Capacity: 81376493568 (75.79 GB)
    Present Capacity: 61117323920 (56.92 GB)
    DFS Remaining: 59576766464 (55.49 GB)
    DFS Used: 1540557456 (1.43 GB)
    DFS Used%: 2.52%
    Under replicated blocks: 0
    Blocks with corrupt replicas: 0
    Missing blocks: 0
    -------------------------------------------------
    Datanodes available...