Replace the installed Hadoop configs with the modified core_hadoop configuration files and set appropriate permissions.
rm -rf $HADOOP_CONF_DIR mkdir -p $HADOOP_CONF_DIR
<Copy all the modified configuration files in core_hadoop to $HADOOP_CONF_DIR on all nodes>
chmod a+x $HADOOP_CONF_DIR/ chown -R $HDFS_USER:$HADOOP_GROUP $HADOOP_CONF_DIR/../ chmod -R 755 $HADOOP_CONF_DIR/../
