Github user tgravescs commented on the pull request:
https://github.com/apache/spark/pull/148#issuecomment-37825208
As pointed out the SPARK_LOG4J_CONF env variable can be used to set the
logging for spark on yarn.
The one downside to making the yarn one default is that we now get
different looking logs if the user just uses the spark one. In the default
most things go to syslog file, and if I just put in the conf/log4j.properties
by copying the template I won't get a syslog file and most things will be in
stdout right?
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