stop-secure-dns.sh
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	#!/usr/bin/env bash

	# Licensed to the Apache Software Foundation (ASF) under one or more
	# contributor license agreements. See the NOTICE file distributed with
	# this work for additional information regarding copyright ownership.
	# The ASF licenses this file to You under the Apache License, Version 2.0
	# (the "License"); you may not use this file except in compliance with
	# the License. You may obtain a copy of the License at
	#
	# http://www.apache.org/licenses/LICENSE-2.0
	#
	# Unless required by applicable law or agreed to in writing, software
	# distributed under the License is distributed on an "AS IS" BASIS,
	# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	# See the License for the specific language governing permissions and
	# limitations under the License.

	# Run as root to start secure datanodes in a security-enabled cluster.

	usage="Usage (run as root in order to stop secure datanodes): stop-secure-dns.sh"

	bin=`dirname "${BASH_SOURCE-$0}"`
	bin=`cd "$bin"; pwd`

	DEFAULT_LIBEXEC_DIR="$bin"/../libexec
	HADOOP_LIBEXEC_DIR=${HADOOP_LIBEXEC_DIR:-$DEFAULT_LIBEXEC_DIR}
	. $HADOOP_LIBEXEC_DIR/hdfs-config.sh

	if [ "$EUID" -eq 0 ] && [ -n "$HADOOP_SECURE_DN_USER" ]; then
	"$HADOOP_PREFIX"/sbin/hadoop-daemons.sh --config $HADOOP_CONF_DIR --script "$bin"/hdfs stop datanode
	else
	echo $usage
	fi