Step 11: Set Variables for Secure DataNodes

In order to allow DataNodes to start on a secure Hadoop cluster, you must set the following variables on all DataNodes in /etc/default/hadoop-hdfs-datanode.

export HADOOP_SECURE_DN_USER=hdfs
export HADOOP_SECURE_DN_PID_DIR=/var/lib/hadoop-hdfs
export HADOOP_SECURE_DN_LOG_DIR=/var/log/hadoop-hdfs
export JSVC_HOME=/usr/lib/bigtop-utils/