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:

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...