#!/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.


# The Hadoop command script
#
# Environment Variables
#
#   JAVA_HOME        The java implementation to use.  Overrides JAVA_HOME.
#
#   HADOOP_CLASSPATH Extra Java CLASSPATH entries.
#
#   HADOOP_USER_CLASSPATH_FIRST      When defined, the HADOOP_CLASSPATH is 
#                                    added in the beginning of the global
#                                    classpath. Can be defined, for example,
#                                    by doing 
#                                    export HADOOP_USER_CLASSPATH_FIRST=true
#
#   HADOOP_HEAPSIZE  The maximum amount of heap to use, in MB. 
#                    Default is 1000.
#
#   HADOOP_OPTS      Extra Java runtime options.
#   
#   HADOOP_NAMENODE_OPTS       These options are added to HADOOP_OPTS 
#   HADOOP_CLIENT_OPTS         when the respective command is run.
#   HADOOP_{COMMAND}_OPTS etc  HADOOP_JT_OPTS applies to JobTracker 
#                              for e.g.  HADOOP_CLIENT_OPTS applies to 
#                              more than one command (fs, dfs, fsck, 
#                              dfsadmin etc)  
#
#   HADOOP_CONF_DIR  Alternate conf dir. Default is ${HADOOP_HOME}/conf.
#
#   HADOOP_ROOT_LOGGER The root appender. Default is INFO,console
#
#   JSVC_HOME  home directory of jsvc binary.  Defaults to jsvc binary packaged
#              within the Hadoop distro.
#
#   JSVC_OUTFILE  path to jsvc output file.  Defaults to
#                 $HADOOP_LOG_DIR/jsvc.out.
#
#   JSVC_ERRFILE  path to jsvc error file.  Defaults to $HADOOP_LOG_DIR/jsvc.err.

bin=`dirname "$0"`
bin=`cd "$bin" > /dev/null; pwd`

if [ -e "$bin"/../libexec/hadoop-config.sh ]; then
  . "$bin"/../libexec/hadoop-config.sh
else
  . "$bin"/hadoop-config.sh
fi

cygwin=false
case "`uname`" in
CYGWIN*) cygwin=true;;
esac

print_usage()
{
  echo "Usage: hadoop [--config confdir] COMMAND"
  echo "where COMMAND is one of:"
  echo "  namenode -format     format the DFS filesystem"
  echo "  secondarynamenode    run the DFS secondary namenode"
  echo "  namenode             run the DFS namenode"
  echo "  datanode             run a DFS datanode"
  echo "  dfsadmin             run a DFS admin client"
  echo "  mradmin              run a Map-Reduce admin client"
  echo "  fsck                 run a DFS filesystem checking utility"
  echo "  fs                   run a generic filesystem user client"
  echo "  balancer             run a cluster balancing utility"
  echo "  oiv                  apply the offline fsimage viewer to an fsimage"
  echo "  fetchdt              fetch a delegation token from the NameNode"
  echo "  jobtracker           run the MapReduce job Tracker node" 
  echo "  pipes                run a Pipes job"
  echo "  tasktracker          run a MapReduce task Tracker node" 
  echo "  historyserver        run job history servers as a standalone daemon"
  echo "  job                  manipulate MapReduce jobs"
  echo "  queue                get information regarding JobQueues" 
  echo "  version              print the version"
  echo "  jar <jar>            run a jar file"
  echo "  distcp <srcurl> <desturl> copy file or directories recursively"
  echo "  distcp2 <srcurl> <desturl> DistCp version 2"
  echo "  archive -archiveName NAME -p <parent path> <src>* <dest> create a hadoop archive"
  echo "  classpath            prints the class path needed to get the"
  echo "                       Hadoop jar and the required libraries"
  echo "  daemonlog            get/set the log level for each daemon"
  echo " or"
  echo "  CLASSNAME            run the class named CLASSNAME"
  echo "Most commands print help when invoked w/o parameters."
}

# if no args specified, show usage
if [ $# = 0 ]; then
  print_usage
  exit 1
fi

# get arguments
COMMAND=$1
shift

# support help commands
case $COMMAND in
  # usage flags
  --help|-help|-h|help)
    print_usage
    exit 0
    ;;
esac

# Determine if we're starting a secure datanode, and if so, redefine appropriate variables
if [ "$COMMAND" == "datanode" ] && [ "$EUID" -eq 0 ] && [ -n "$HADOOP_SECURE_DN_USER" ]; then
  HADOOP_PID_DIR=$HADOOP_SECURE_DN_PID_DIR
  HADOOP_LOG_DIR=$HADOOP_SECURE_DN_LOG_DIR
  HADOOP_IDENT_STRING=$HADOOP_SECURE_DN_USER
  starting_secure_dn="true"
fi

# some Java parameters
if [ "$JAVA_HOME" != "" ]; then
  #echo "run java in $JAVA_HOME"
  JAVA_HOME=$JAVA_HOME
fi
  
if [ "$JAVA_HOME" = "" ]; then
  echo "Error: JAVA_HOME is not set."
  exit 1
fi

JAVA=$JAVA_HOME/bin/java
JAVA_HEAP_MAX=-Xmx1000m 

# check envvars which might override default args
if [ "$HADOOP_HEAPSIZE" != "" ]; then
  #echo "run with heapsize $HADOOP_HEAPSIZE"
  JAVA_HEAP_MAX="-Xmx""$HADOOP_HEAPSIZE""m"
  #echo $JAVA_HEAP_MAX
fi

# CLASSPATH initially contains $HADOOP_CONF_DIR
CLASSPATH="${HADOOP_CONF_DIR}"
if [ "$HADOOP_USER_CLASSPATH_FIRST" != "" ] && [ "$HADOOP_CLASSPATH" != "" ] ; then
  CLASSPATH=${CLASSPATH}:${HADOOP_CLASSPATH}
fi
CLASSPATH=${CLASSPATH}:$JAVA_HOME/lib/tools.jar

# for developers, add Hadoop classes to CLASSPATH
if [ -d "$HADOOP_HOME/build/classes" ]; then
  CLASSPATH=${CLASSPATH}:$HADOOP_HOME/build/classes
fi
if [ -d "$HADOOP_HOME/build/webapps" ]; then
  CLASSPATH=${CLASSPATH}:$HADOOP_HOME/build
fi
if [ -d "$HADOOP_HOME/build/test/classes" ]; then
  CLASSPATH=${CLASSPATH}:$HADOOP_HOME/build/test/classes
fi
if [ -d "$HADOOP_HOME/build/tools" ]; then
  CLASSPATH=${CLASSPATH}:$HADOOP_HOME/build/tools
fi

# so that filenames w/ spaces are handled correctly in loops below
IFS=

# for releases, add core hadoop jar & webapps to CLASSPATH
if [ -e $HADOOP_PREFIX/share/hadoop/hadoop-core-* ]; then
  # binary layout
  if [ -d "$HADOOP_PREFIX/share/hadoop/webapps" ]; then
    CLASSPATH=${CLASSPATH}:$HADOOP_PREFIX/share/hadoop
  fi
  for f in $HADOOP_PREFIX/share/hadoop/hadoop-core-*.jar; do
    CLASSPATH=${CLASSPATH}:$f;
  done

  # add libs to CLASSPATH
  for f in $HADOOP_PREFIX/share/hadoop/lib/*.jar; do
    CLASSPATH=${CLASSPATH}:$f;
  done

  for f in $HADOOP_PREFIX/share/hadoop/lib/jsp-2.1/*.jar; do
    CLASSPATH=${CLASSPATH}:$f;
  done

  for f in $HADOOP_PREFIX/share/hadoop/hadoop-tools-*.jar; do
    TOOL_PATH=${TOOL_PATH}:$f;
  done
else
  # tarball layout
  if [ -d "$HADOOP_HOME/webapps" ]; then
    CLASSPATH=${CLASSPATH}:$HADOOP_HOME
  fi
  for f in $HADOOP_HOME/hadoop-core-*.jar; do
    CLASSPATH=${CLASSPATH}:$f;
  done

  # add libs to CLASSPATH
  for f in $HADOOP_HOME/lib/*.jar; do
    CLASSPATH=${CLASSPATH}:$f;
  done

  if [ -d "$HADOOP_HOME/build/ivy/lib/Hadoop/common" ]; then
    for f in $HADOOP_HOME/build/ivy/lib/Hadoop/common/*.jar; do
      CLASSPATH=${CLASSPATH}:$f;
    done
  fi

  for f in $HADOOP_HOME/lib/jsp-2.1/*.jar; do
    CLASSPATH=${CLASSPATH}:$f;
  done

  for f in $HADOOP_HOME/hadoop-tools-*.jar; do
    TOOL_PATH=${TOOL_PATH}:$f;
  done
  for f in $HADOOP_HOME/build/hadoop-tools-*.jar; do
    TOOL_PATH=${TOOL_PATH}:$f;
  done
fi

# add user-specified CLASSPATH last
if [ "$HADOOP_USER_CLASSPATH_FIRST" = "" ] && [ "$HADOOP_CLASSPATH" != "" ]; then
  CLASSPATH=${CLASSPATH}:${HADOOP_CLASSPATH}
fi

# default log directory & file
if [ "$HADOOP_LOG_DIR" = "" ]; then
  HADOOP_LOG_DIR="$HADOOP_HOME/logs"
fi
if [ "$HADOOP_LOGFILE" = "" ]; then
  HADOOP_LOGFILE='hadoop.log'
fi

# default policy file for service-level authorization
if [ "$HADOOP_POLICYFILE" = "" ]; then
  HADOOP_POLICYFILE="hadoop-policy.xml"
fi

# restore ordinary behaviour
unset IFS

# figure out which class to run
if [ "$COMMAND" = "classpath" ] ; then
  if $cygwin; then
    CLASSPATH=`cygpath -p -w "$CLASSPATH"`
  fi
  echo $CLASSPATH
  exit
elif [ "$COMMAND" = "namenode" ] ; then
  CLASS='org.apache.hadoop.hdfs.server.namenode.NameNode'
  HADOOP_OPTS="$HADOOP_OPTS $HADOOP_NAMENODE_OPTS"
elif [ "$COMMAND" = "secondarynamenode" ] ; then
  CLASS='org.apache.hadoop.hdfs.server.namenode.SecondaryNameNode'
  HADOOP_OPTS="$HADOOP_OPTS $HADOOP_SECONDARYNAMENODE_OPTS"
elif [ "$COMMAND" = "datanode" ] ; then
  CLASS='org.apache.hadoop.hdfs.server.datanode.DataNode'
  HADOOP_OPTS=${HADOOP_OPTS/-server/}
  if [ "$starting_secure_dn" = "true" ]; then
    HADOOP_OPTS="-jvm server $HADOOP_OPTS  $HADOOP_DATANODE_OPTS"  
  else
    HADOOP_OPTS="$HADOOP_OPTS -server $HADOOP_DATANODE_OPTS"
  fi
elif [ "$COMMAND" = "fs" ] ; then
  CLASS=org.apache.hadoop.fs.FsShell
  HADOOP_OPTS="$HADOOP_OPTS $HADOOP_CLIENT_OPTS"
elif [ "$COMMAND" = "dfs" ] ; then
  CLASS=org.apache.hadoop.fs.FsShell
  HADOOP_OPTS="$HADOOP_OPTS $HADOOP_CLIENT_OPTS"
elif [ "$COMMAND" = "dfsadmin" ] ; then
  CLASS=org.apache.hadoop.hdfs.tools.DFSAdmin
  HADOOP_OPTS="$HADOOP_OPTS $HADOOP_CLIENT_OPTS"
elif [ "$COMMAND" = "mradmin" ] ; then
  CLASS=org.apache.hadoop.mapred.tools.MRAdmin
  HADOOP_OPTS="$HADOOP_OPTS $HADOOP_CLIENT_OPTS"
elif [ "$COMMAND" = "fsck" ] ; then
  CLASS=org.apache.hadoop.hdfs.tools.DFSck
  HADOOP_OPTS="$HADOOP_OPTS $HADOOP_CLIENT_OPTS"
elif [ "$COMMAND" = "balancer" ] ; then
  CLASS=org.apache.hadoop.hdfs.server.balancer.Balancer
  HADOOP_OPTS="$HADOOP_OPTS $HADOOP_BALANCER_OPTS"
elif [ "$COMMAND" = "oiv" ] ; then
  CLASS=org.apache.hadoop.hdfs.tools.offlineImageViewer.OfflineImageViewer
elif [ "$COMMAND" = "fetchdt" ] ; then
  CLASS=org.apache.hadoop.hdfs.tools.DelegationTokenFetcher
elif [ "$COMMAND" = "jobtracker" ] ; then
  CLASS=org.apache.hadoop.mapred.JobTracker
  HADOOP_OPTS="$HADOOP_OPTS $HADOOP_JOBTRACKER_OPTS"
elif [ "$COMMAND" = "historyserver" ] ; then
  CLASS=org.apache.hadoop.mapred.JobHistoryServer
  HADOOP_OPTS="$HADOOP_OPTS $HADOOP_JOB_HISTORYSERVER_OPTS"
elif [ "$COMMAND" = "tasktracker" ] ; then
  CLASS=org.apache.hadoop.mapred.TaskTracker
  HADOOP_OPTS="$HADOOP_OPTS $HADOOP_TASKTRACKER_OPTS"
elif [ "$COMMAND" = "job" ] ; then
  CLASS=org.apache.hadoop.mapred.JobClient
  HADOOP_OPTS="$HADOOP_OPTS $HADOOP_CLIENT_OPTS"
elif [ "$COMMAND" = "queue" ] ; then
  CLASS=org.apache.hadoop.mapred.JobQueueClient
  HADOOP_OPTS="$HADOOP_OPTS $HADOOP_CLIENT_OPTS"
elif [ "$COMMAND" = "pipes" ] ; then
  CLASS=org.apache.hadoop.mapred.pipes.Submitter
  HADOOP_OPTS="$HADOOP_OPTS $HADOOP_CLIENT_OPTS"
elif [ "$COMMAND" = "version" ] ; then
  CLASS=org.apache.hadoop.util.VersionInfo
  HADOOP_OPTS="$HADOOP_OPTS $HADOOP_CLIENT_OPTS"
elif [ "$COMMAND" = "jar" ] ; then
  CLASS=org.apache.hadoop.util.RunJar
  HADOOP_OPTS="$HADOOP_OPTS $HADOOP_CLIENT_OPTS"
elif [ "$COMMAND" = "distcp" ] ; then
  CLASS=org.apache.hadoop.tools.DistCp
  CLASSPATH=${CLASSPATH}:${TOOL_PATH}
  HADOOP_OPTS="$HADOOP_OPTS $HADOOP_CLIENT_OPTS"
elif [ "$COMMAND" = "distcp2" ] ; then
  CLASS=org.apache.hadoop.tools.distcp2.DistCp
  CLASSPATH=${CLASSPATH}:${TOOL_PATH}
  HADOOP_OPTS="$HADOOP_OPTS $HADOOP_CLIENT_OPTS"
elif [ "$COMMAND" = "daemonlog" ] ; then
  CLASS=org.apache.hadoop.log.LogLevel
  HADOOP_OPTS="$HADOOP_OPTS $HADOOP_CLIENT_OPTS"
elif [ "$COMMAND" = "archive" ] ; then
  CLASS=org.apache.hadoop.tools.HadoopArchives
  CLASSPATH=${CLASSPATH}:${TOOL_PATH}
  HADOOP_OPTS="$HADOOP_OPTS $HADOOP_CLIENT_OPTS"
elif [ "$COMMAND" = "sampler" ] ; then
  CLASS=org.apache.hadoop.mapred.lib.InputSampler
  HADOOP_OPTS="$HADOOP_OPTS $HADOOP_CLIENT_OPTS"
else
  CLASS=$COMMAND
fi

# cygwin path translation
if $cygwin; then
  CLASSPATH=`cygpath -p -w "$CLASSPATH"`
  HADOOP_HOME=`cygpath -w "$HADOOP_HOME"`
  HADOOP_LOG_DIR=`cygpath -w "$HADOOP_LOG_DIR"`
  TOOL_PATH=`cygpath -p -w "$TOOL_PATH"`
fi

#Determine the JAVA_PLATFORM
JAVA_PLATFORM=`CLASSPATH=${CLASSPATH} ${JAVA} -Xmx32m ${HADOOP_JAVA_PLATFORM_OPTS} org.apache.hadoop.util.PlatformName | sed -e "s/ /_/g"`
  
# setup 'java.library.path' for native-hadoop code if necessary
JAVA_LIBRARY_PATH=''
if [ -d "${HADOOP_HOME}/build/native" -o -d "${HADOOP_HOME}/lib/native" -o -e "${HADOOP_PREFIX}/lib/libhadoop.a" ]; then

  if [ -d "$HADOOP_HOME/build/native" ]; then
    JAVA_LIBRARY_PATH=${HADOOP_HOME}/build/native/${JAVA_PLATFORM}/lib
  fi
  
  if [ -d "${HADOOP_HOME}/lib/native" ]; then
    if [ "x$JAVA_LIBRARY_PATH" != "x" ]; then
      JAVA_LIBRARY_PATH=${JAVA_LIBRARY_PATH}:${HADOOP_HOME}/lib/native/${JAVA_PLATFORM}
    else
      JAVA_LIBRARY_PATH=${HADOOP_HOME}/lib/native/${JAVA_PLATFORM}
    fi
  fi

  if [ -e "${HADOOP_PREFIX}/lib/libhadoop.a" ]; then
    JAVA_LIBRARY_PATH=${HADOOP_PREFIX}/lib
  fi
fi

# cygwin path translation
if $cygwin; then
  JAVA_LIBRARY_PATH=`cygpath -p "$JAVA_LIBRARY_PATH"`
fi

HADOOP_OPTS="$HADOOP_OPTS -Dhadoop.log.dir=$HADOOP_LOG_DIR"
HADOOP_OPTS="$HADOOP_OPTS -Dhadoop.log.file=$HADOOP_LOGFILE"
HADOOP_OPTS="$HADOOP_OPTS -Dhadoop.home.dir=$HADOOP_HOME"
HADOOP_OPTS="$HADOOP_OPTS -Dhadoop.id.str=$HADOOP_IDENT_STRING"
HADOOP_OPTS="$HADOOP_OPTS -Dhadoop.root.logger=${HADOOP_ROOT_LOGGER:-INFO,console}"

#turn security logger on the namenode and jobtracker only
if [ $COMMAND = "namenode" ] || [ $COMMAND = "jobtracker" ]; then
  HADOOP_OPTS="$HADOOP_OPTS -Dhadoop.security.logger=${HADOOP_SECURITY_LOGGER:-INFO,DRFAS}"
else
  HADOOP_OPTS="$HADOOP_OPTS -Dhadoop.security.logger=${HADOOP_SECURITY_LOGGER:-INFO,NullAppender}"
fi

if [ "x$JAVA_LIBRARY_PATH" != "x" ]; then
  HADOOP_OPTS="$HADOOP_OPTS -Djava.library.path=$JAVA_LIBRARY_PATH"
  export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:$JAVA_LIBRARY_PATH
fi  
HADOOP_OPTS="$HADOOP_OPTS -Dhadoop.policy.file=$HADOOP_POLICYFILE"

# Check to see if we should start a secure datanode
if [ "$starting_secure_dn" = "true" ]; then
  if [ "$HADOOP_PID_DIR" = "" ]; then
    HADOOP_SECURE_DN_PID="/tmp/hadoop_secure_dn.pid"
  else
    HADOOP_SECURE_DN_PID="$HADOOP_PID_DIR/hadoop_secure_dn.pid"
  fi

  if [[ $JSVC_HOME ]]; then
    JSVC="$JSVC_HOME/jsvc"
  else
    if [ "$JAVA_PLATFORM" = "Linux-amd64-64" ]; then
      JSVC_ARCH="amd64"
    else
      JSVC_ARCH="i386"
    fi
    JSVC="$HADOOP_HOME/libexec/jsvc.${JSVC_ARCH}"
  fi

  if [[ ! $JSVC_OUTFILE ]]; then
    JSVC_OUTFILE="$HADOOP_LOG_DIR/jsvc.out"
  fi

  if [[ ! $JSVC_ERRFILE ]]; then
    JSVC_ERRFILE="$HADOOP_LOG_DIR/jsvc.err"
  fi

  exec "$JSVC" -Dproc_$COMMAND -outfile "$JSVC_OUTFILE" \
               -errfile "$JSVC_ERRFILE" \
               -pidfile "$HADOOP_SECURE_DN_PID" \
               -nodetach \
               -user "$HADOOP_SECURE_DN_USER" \
               -cp "$CLASSPATH" \
               $JAVA_HEAP_MAX $HADOOP_OPTS \
               org.apache.hadoop.hdfs.server.datanode.SecureDataNodeStarter "$@"
else
  # run it
  exec "$JAVA" -Dproc_$COMMAND $JAVA_HEAP_MAX $HADOOP_OPTS -classpath "$CLASSPATH" $CLASS "$@"
fi