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MapReduce >> mail # user >> log4j defaults for AM & task

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Re: log4j defaults for AM & task
Unfortunately this isnt' well documented, but if the cmd-line for your container has <LOG_DIR>, that variable will be substituted by the NodeManager with the directory where the logs will be put.

For e.g. you can pass in: myapp.py 2> <LOG_DIR>/stderr etc.

I've opened https://issues.apache.org/jira/browse/YARN-772 to track documentation for this and other such features which are available.


On Jun 6, 2013, at 12:44 PM, John Lilley wrote:

> In debugging a custom AM and its tasks, I want to create log4j settings so that the log output goes to someplace “standard” where I can collect all of the logs at the end of the run and see what happened to each part.  Is there a convention for doing this?  Does each task get a well-defined and unique directory where I can leave log files at the end of the run?
> Thanks,
> john

Arun C. Murthy
Hortonworks Inc.