Github user vanzin commented on the pull request:
https://github.com/apache/spark/pull/560#issuecomment-45149619
Hi Tom,
I just removed all the log4j-related code. You can achieve both previously
available use cases with spark-submit arguments:
* To use a custom config file, just say "--files
/path/to/log4j.properties", and that gets distributed to the worker nodes and
is available at the root of the classpath, so it overrides the default
log4j-spark-container.properties.
* To use a local config file, just say
"spark.executor.extraJavaOpts=-Dlog4j.configuration=file:/path/to/log4j.properties"
Note that since local: is broken in 1.0.0, the second one above cannot be
achieved by using SPARK_LOG4J_CONF in that release.
As for backwards compatibility, SPARK_LOG4J_CONF doesn't seem to be
documented anywhere, and the tricks above work fine with 1.0.0. I guess I could
add the content of SPARK_LOG4J_CONF to the list of copied files if you think
that's important.
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