GC logging for Spark History Server

[#1]

To print GC details, please add the following line in Spark--> config--> Advanced spark-env --> spark-env template and restart spark history server.

export SPARK_DAEMON_JAVA_OPTS=" -verbose:gc -XX:+PrintGCDetails -XX:+PrintGCDateStamps -Xloggc:{{spark_log_dir}}/spark_history_server.gc.`date +'%Y%m%d%H%M'`"