Github user ejsarge-gr commented on the pull request:
https://github.com/apache/spark/pull/4998#issuecomment-118378860
Would we be able to document this better or re-examine it a little?
The problem is that log4j 1.2.17 is shaded into the assembly jar. Thus, to
override it we need to get our jars listed at the start of the classpath.
However extraClassPath says that it *appends* to the classpath (instead of
prepending).
SPARK_CLASSPATH appears to be mostly
[deprecated|http://mail-archives.us.apache.org/mod_mbox/spark-user/201503.mbox/%[email protected]%3E].
Log4j2 support is essentially required if you want to send the logs to
centralised logging via Flume.
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