about "yarn.application.classpath"

[Henry Hung <YT...@winbond.com>]

Hi Hadoop Users,

In hadoop 2.2.0, if I want yarn applications to be able to include external jars, I need to specify "yarn.application.classpath" in yarn-site.xml, including the default value, so it will be like this:
  <property>
    <description>CLASSPATH for YARN applications. A comma-separated list
    of CLASSPATH entries</description>
     <name>yarn.application.classpath</name>
     <value>$HADOOP_CONF_DIR,$HADOOP_COMMON_HOME/share/hadoop/common/*,$HADOOP_COMMON_HOME/share/hadoop/common/lib/*,$HADOOP_HDFS_HOME/share/hadoop/hdfs/*,$HADOOP_HDFS_HOME/share/hadoop/hdfs/lib/*,$HADOOP_YARN_HOME/share/hadoop/yarn/*,$HADOOP_YARN_HOME/share/hadoop/yarn/lib/*,/my/own/external/jars</value>
  </property>

While in hadoop 1.0.4, I just need to modify "HADOOP_CLASSPATH" in hadoop-env.sh

I just want to know if there are more perfect / cleaner way to do this?

I don't like to have to repeat the default values of yarn.application.classpath, I want it more like to use some kine extensions, such as "yarn.application.classpath.ext":

  <property>
    <description>CLASSPATH for YARN applications. A comma-separated list
    of CLASSPATH entries</description>
     <name>yarn.application.classpath.ext</name>
     <value>/my/own/external/jars</value>
  </property>

Best regards,
Henry

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