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Learning YARN

You're reading from Learning YARN Moving beyond MapReduce - learn resource management and big data processing using YARN

Product type Paperback

Published in Aug 2015

Publisher

ISBN-13 9781784393960

Length 278 pages

Edition 1st Edition

Tools

Hadoop

Concepts

Data Processing

Table of Contents (14) Chapters

Preface

1. Starting with YARN Basics FREE CHAPTER

2. Setting up a Hadoop-YARN Cluster

3. Administering a Hadoop-YARN Cluster

4. Executing Applications Using YARN

5. Understanding YARN Life Cycle Management

6. Migrating from MRv1 to MRv2

7. Writing Your Own YARN Applications

8. Dive Deep into YARN Components

9. Exploring YARN REST Services

10. Scheduling YARN Applications

11. Enabling Security in YARN

12. Real-time Data Analytics Using YARN

Index

Using the Hadoop-YARN commands

YARN commands are invoked using the bin/yarn script in the Hadoop bundle. The basic syntax for the yarn command is:

yarn [--config confdir] COMMAND COMMAND_OPTIONS

Running the YARN script without any arguments, prints the description for all the commands. The config option is optional and its default value is $HADOOP_PREFIX/etc/hadoop.

YARN commands are classified as user and administration commands, as shown in the following figure:

Using the Hadoop-YARN commands

The user commands

Hadoop-YARN clients execute the user commands. These clients connect to the YARN services using the configuration settings specified in the yarn-site.xml file. As specified in the previous chapter, the yarn-site.xml file and the other configuration files are all placed in the Hadoop configuration folder (/home/hduser/hadoop-2.5.1/etc/conf/). There are mainly six user commands in the Hadoop-YARN framework.

Jar

The jar command is used to run a jar file with the YARN code, that is, to submit a YARN application to the...

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