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
On Tue, Apr 9, 2013 at 1:24 PM, Philip Langdale wrote:

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 extra variables.

If you can explain what your situation is, I can hopefully give you more
relevant information.


On 8 April 2013 22:43, John Meza wrote:

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?


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