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+#!/usr/bin/env bash
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+
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+# Licensed to the Apache Software Foundation (ASF) under one or more
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+# contributor license agreements. See the NOTICE file distributed with
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+# this work for additional information regarding copyright ownership.
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+# The ASF licenses this file to You under the Apache License, Version 2.0
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+# (the "License"); you may not use this file except in compliance with
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+# the License. You may obtain a copy of the License at
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+#
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+# http://www.apache.org/licenses/LICENSE-2.0
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+#
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+# Unless required by applicable law or agreed to in writing, software
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+# distributed under the License is distributed on an "AS IS" BASIS,
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+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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+# See the License for the specific language governing permissions and
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+# limitations under the License.
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+
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+
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+# Runs a yarn command as a daemon.
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+#
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+# Environment Variables
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+#
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+# YARN_CONF_DIR Alternate conf dir. Default is ${YARN_HOME}/conf.
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+# YARN_LOG_DIR Where log files are stored. PWD by default.
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+# YARN_MASTER host:path where hadoop code should be rsync'd from
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+# YARN_PID_DIR The pid files are stored. /tmp by default.
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+# YARN_IDENT_STRING A string representing this instance of hadoop. $USER by default
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+# YARN_NICENESS The scheduling priority for daemons. Defaults to 0.
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+##
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+
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+usage="Usage: mr-jobhistory-daemon.sh [--config <conf-dir>] [--hosts hostlistfile] (start|stop) <mapred-command> "
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+
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+# if no args specified, show usage
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+if [ $# -le 1 ]; then
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+ echo $usage
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+ exit 1
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+fi
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+
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+bin=`dirname "${BASH_SOURCE-$0}"`
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+bin=`cd "$bin"; pwd`
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+
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+DEFAULT_LIBEXEC_DIR="$bin"/../libexec
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+HADOOP_LIBEXEC_DIR=${HADOOP_LIBEXEC_DIR:-$DEFAULT_LIBEXEC_DIR}
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+. $HADOOP_LIBEXEC_DIR/yarn-config.sh
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+
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+# get arguments
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+startStop=$1
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+shift
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+command=$1
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+shift
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+
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+hadoop_rotate_log ()
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+{
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+ log=$1;
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+ num=5;
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+ if [ -n "$2" ]; then
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+ num=$2
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+ fi
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+ if [ -f "$log" ]; then # rotate logs
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+ while [ $num -gt 1 ]; do
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+ prev=`expr $num - 1`
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+ [ -f "$log.$prev" ] && mv "$log.$prev" "$log.$num"
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+ num=$prev
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+ done
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+ mv "$log" "$log.$num";
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+ fi
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+}
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+
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+if [ -f "${YARN_CONF_DIR}/yarn-env.sh" ]; then
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+ . "${YARN_CONF_DIR}/yarn-env.sh"
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+fi
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+
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+if [ "$YARN_IDENT_STRING" = "" ]; then
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+ export YARN_IDENT_STRING="$USER"
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+fi
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+
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+# get log directory
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+if [ "$YARN_LOG_DIR" = "" ]; then
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+ export YARN_LOG_DIR="$YARN_HOME/logs"
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+fi
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+mkdir -p "$YARN_LOG_DIR"
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+chown $YARN_IDENT_STRING $YARN_LOG_DIR
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+
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+if [ "$YARN_PID_DIR" = "" ]; then
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+ YARN_PID_DIR=/tmp
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+fi
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+
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+# some variables
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+export YARN_LOGFILE=yarn-$YARN_IDENT_STRING-$command-$HOSTNAME.log
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+export YARN_ROOT_LOGGER=${YARN_ROOT_LOGGER:-INFO,DRFA}
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+log=$YARN_LOG_DIR/yarn-$YARN_IDENT_STRING-$command-$HOSTNAME.out
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+pid=$YARN_PID_DIR/yarn-$YARN_IDENT_STRING-$command.pid
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+
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+# Set default scheduling priority
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+if [ "$YARN_NICENESS" = "" ]; then
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+ export YARN_NICENESS=0
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+fi
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+
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+case $startStop in
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+
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+ (start)
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+
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+ mkdir -p "$YARN_PID_DIR"
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+
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+ if [ -f $pid ]; then
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+ if kill -0 `cat $pid` > /dev/null 2>&1; then
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+ echo $command running as process `cat $pid`. Stop it first.
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+ exit 1
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+ fi
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+ fi
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+
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+ if [ "$YARN_MASTER" != "" ]; then
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+ echo rsync from $YARN_MASTER
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+ rsync -a -e ssh --delete --exclude=.svn --exclude='logs/*' --exclude='contrib/hod/logs/*' $YARN_MASTER/ "$YARN_HOME"
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+ fi
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+
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+ hadoop_rotate_log $log
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+ echo starting $command, logging to $log
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+ cd "$YARN_HOME"
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+ nohup nice -n $YARN_NICENESS "$YARN_HOME"/bin/mapred --config $YARN_CONF_DIR $command "$@" > "$log" 2>&1 < /dev/null &
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+ echo $! > $pid
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+ sleep 1; head "$log"
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+ ;;
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+
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+ (stop)
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+
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+ if [ -f $pid ]; then
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+ if kill -0 `cat $pid` > /dev/null 2>&1; then
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+ echo stopping $command
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+ kill `cat $pid`
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+ else
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+ echo no $command to stop
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+ fi
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+ else
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+ echo no $command to stop
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+ fi
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+ ;;
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+
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+ (*)
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+ echo $usage
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+ exit 1
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+ ;;
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+
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+esac
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Arun Murthy