Hadoop Environment Variables

Hadoop Environment Variables

	John Meza
	Apr 9, 2013 at 5:43 am

Is there a list of the environment variables that SCM creates when
installing CDH?
Many pages refer to HADOOP_HOME, HADOOP_INSTALL, etc.

Or does the user have to manually create the env variables if needed?
If so, is there a list of typical directories that SCM installs to?

thanks
John

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Philip Langdale: Hi John, You'll need to be more specific about what you're trying to do. There are a bunch of environment variables that affect how Hadoop runs, and we do set them as part of running a datanode, or tasktracker, etc, but these are not all relevant to a client that's connecting to Hadoop to do work. Under normal conditions, it's sufficient for a client to find the hadoop configuration directory under /etc and use its contents to get up and running. In this scenario, you don't need to set any
John Meza: It's more than running running a job(s), which i'm also doing. I'm also becoming familiar with the managment, administration and tuning of a 8 node test cluster. As I read web pages, books, etc., they all refer to the environment variables (HADDOP_INSTALL, HADOOP_CLASSPATH,...). The need to find the environment variables, Hadoop specific directories, and config files is so common, ocurring everyday, these lists would be very helpful. thanks John
Darren Lo: Hi John, Cloudera Manager handles these things for you so you don't have to bother with them. If you want to see exactly what CM is doing, you can look in the processes tab for each role and look at the environment and the stderr log to see exactly what environment variables are being set. There are some use cases where you need to add custom jars to a path. This is often handled with a special environment variable such as AUX_CLASSPATH or sometimes in a -site.xml file. You can use the

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group	scm-users @
categories	hadoop
posted	Apr 9, '13 at 5:43a
active	Apr 10, '13 at 3:58p
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website	cloudera.com
irc	#hadoop

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Hadoop Environment Variables

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