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Learning Hbase

You're reading from   Learning Hbase Learn the fundamentals of HBase administration and development with the help of real-time scenarios

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Product type Paperback
Published in Nov 2014
Publisher
ISBN-13 9781783985944
Length 326 pages
Edition 1st Edition
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Author (1):
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Shashwat Shriparv Shashwat Shriparv
Author Profile Icon Shashwat Shriparv
Shashwat Shriparv
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Table of Contents (12) Chapters Close

Preface 1. Understanding the HBase Ecosystem FREE CHAPTER 2. Let's Begin with HBase 3. Let's Start Building It 4. Optimizing the HBase/Hadoop Cluster 5. The Storage, Structure Layout, and Data Model of HBase 6. HBase Cluster Maintenance and Troubleshooting 7. Scripting in HBase 8. Coding HBase in Java 9. Advance Coding in Java for HBase 10. HBase Use Cases Index

Installing and configuring NTP


In this section, we will install and configure NTP on Ubuntu and CentOS/Red Hat.

First, we will look at the steps to install and configure NTP on Ubuntu. Ubuntu comes preinstalled with ntpdate, and this service runs automatically and updates time data at system startup. If we need a more frequent update, we can set up a cron job for the same. For this, we can create a script file such as updateTimeDate.sh and include the following lines:

#!bin/sh
ntpdate ntp.ubuntu.com

Set this as a crontab job to update the system date more frequently, keep in mind that this file must be the same, and note that the frequency of crontab must be the same for all the nodes in the cluster.

We can use the sudontpq –np command to check if the NTP service is running properly.

It can also be installed using the following commands, if it is not already installed:

sudo aptitude update
sudo aptitude install ntp

Note

The aptitude command was formerly used as apt-get.

On CentOS or Red Hat, we...

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