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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.
+
+
+# Runs a yarn command as a daemon.
+#
+# Environment Variables
+#
+# YARN_CONF_DIR Alternate conf dir. Default is ${HADOOP_YARN_HOME}/conf.
+# YARN_LOG_DIR Where log files are stored. PWD by default.
+# YARN_MASTER host:path where hadoop code should be rsync'd from
+# YARN_PID_DIR The pid files are stored. /tmp by default.
+# YARN_IDENT_STRING A string representing this instance of hadoop. $USER by default
+# YARN_NICENESS The scheduling priority for daemons. Defaults to 0.
+##
+
+usage="Usage: yarn-daemon.sh [--config <conf-dir>] [--hosts hostlistfile] (start|stop) <yarn-command> "
+
+# if no args specified, show usage
+if [ $# -le 1 ]; then
+ echo $usage
+ exit 1
+fi
+
+bin=`dirname "${BASH_SOURCE-$0}"`
+bin=`cd "$bin"; pwd`
+
+DEFAULT_LIBEXEC_DIR="$bin"/../libexec
+HADOOP_LIBEXEC_DIR=${HADOOP_LIBEXEC_DIR:-$DEFAULT_LIBEXEC_DIR}
+. $HADOOP_LIBEXEC_DIR/yarn-config.sh
+
+# get arguments
+startStop=$1
+shift
+command=$1
+shift
+
+hadoop_rotate_log ()
+{
+ log=$1;
+ num=5;
+ if [ -n "$2" ]; then
+ num=$2
+ fi
+ if [ -f "$log" ]; then # rotate logs
+ while [ $num -gt 1 ]; do
+ prev=`expr $num - 1`
+ [ -f "$log.$prev" ] && mv "$log.$prev" "$log.$num"
+ num=$prev
+ done
+ mv "$log" "$log.$num";
+ fi
+}
+
+if [ -f "${YARN_CONF_DIR}/yarn-env.sh" ]; then
+ . "${YARN_CONF_DIR}/yarn-env.sh"
+fi
+
+if [ "$YARN_IDENT_STRING" = "" ]; then
+ export YARN_IDENT_STRING="$USER"
+fi
+
+# get log directory
+if [ "$YARN_LOG_DIR" = "" ]; then
+ export YARN_LOG_DIR="$HADOOP_YARN_HOME/logs"
+fi
+
+if [ ! -w "$YARN_LOG_DIR" ] ; then
+ mkdir -p "$YARN_LOG_DIR"
+ chown $YARN_IDENT_STRING $YARN_LOG_DIR
+fi
+
+if [ "$YARN_PID_DIR" = "" ]; then
+ YARN_PID_DIR=/tmp
+fi
+
+# some variables
+export YARN_LOGFILE=yarn-$YARN_IDENT_STRING-$command-$HOSTNAME.log
+export YARN_ROOT_LOGGER=${YARN_ROOT_LOGGER:-INFO,RFA}
+log=$YARN_LOG_DIR/yarn-$YARN_IDENT_STRING-$command-$HOSTNAME.out
+pid=$YARN_PID_DIR/yarn-$YARN_IDENT_STRING-$command.pid
+YARN_STOP_TIMEOUT=${YARN_STOP_TIMEOUT:-5}
+
+# Set default scheduling priority
+if [ "$YARN_NICENESS" = "" ]; then
+ export YARN_NICENESS=0
+fi
+
+case $startStop in
+
+ (start)
+
+ [ -w "$YARN_PID_DIR" ] || mkdir -p "$YARN_PID_DIR"
+
+ if [ -f $pid ]; then
+ if kill -0 `cat $pid` > /dev/null 2>&1; then
+ echo $command running as process `cat $pid`. Stop it first.
+ exit 1
+ fi
+ fi
+
+ if [ "$YARN_MASTER" != "" ]; then
+ echo rsync from $YARN_MASTER
+ rsync -a -e ssh --delete --exclude=.svn --exclude='logs/*' --exclude='contrib/hod/logs/*' $YARN_MASTER/ "$HADOOP_YARN_HOME"
+ fi
+
+ hadoop_rotate_log $log
+ echo starting $command, logging to $log
+ cd "$HADOOP_YARN_HOME"
+ nohup nice -n $YARN_NICENESS "$HADOOP_YARN_HOME"/bin/yarn --config $YARN_CONF_DIR $command "$@" > "$log" 2>&1 < /dev/null &
+ echo $! > $pid
+ sleep 1
+ head "$log"
+ # capture the ulimit output
+ echo "ulimit -a" >> $log
+ ulimit -a >> $log 2>&1
+ ;;
+
+ (stop)
+
+ if [ -f $pid ]; then
+ TARGET_PID=`cat $pid`
+ if kill -0 $TARGET_PID > /dev/null 2>&1; then
+ echo stopping $command
+ kill $TARGET_PID
+ sleep $YARN_STOP_TIMEOUT
+ if kill -0 $TARGET_PID > /dev/null 2>&1; then
+ echo "$command did not stop gracefully after $YARN_STOP_TIMEOUT seconds: killing with kill -9"
+ kill -9 $TARGET_PID
+ fi
+ else
+ echo no $command to stop
+ fi
+ else
+ echo no $command to stop
+ fi
+ ;;
+
+ (*)
+ echo $usage
+ exit 1
+ ;;
+
+esac
+
+