Custom log4j appender in spark executor

Question

I\'m trying to use custom log4j appender inside spark executor, in order to forward all logs to Apache Kafka.

The problem is, log4j is initialized before fatjar\'s c

Answer 1

Ended up submitting extra jar with logging deps and loading it before user classpath.

LOG_JAR="${THISDIR}/../lib/logging.jar"
spark-submit ...... \
  --files "${LOG4J_CONF},${LOG_JAR}" \
  --conf "spark.driver.extraJavaOptions=-Dlog4j.configuration=`basename ${LOG4J_CONF}`" \
  --conf "spark.driver.extraClassPath=`basename ${LOG_JAR}`" \
  --conf "spark.executor.extraJavaOptions=-Dlog4j.configuration=`basename ${LOG4J_CONF}`" \
  --conf "spark.executor.extraClassPath=`basename ${LOG_JAR}`" \
  ...

https://issues.apache.org/jira/browse/SPARK-10881?filter=-2