hadoop/bin/hadoop

#!/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.

# This script runs the hadoop core commands. 

bin=`dirname "$0"`
bin=`cd "$bin"; pwd`
 
. "$bin"/hadoop-config.sh

function print_usage(){
  echo "Usage: hadoop [--config confdir] COMMAND"
  echo "       where COMMAND is one of:"
  echo "  fs                   run a generic filesystem user client"
  echo "  version              print the version"
  echo "  jar <jar>            run a jar file"
  echo "  distcp <srcurl> <desturl> copy file or directories recursively"
  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 ""
  echo "Most commands print help when invoked w/o parameters."
}

if [ $# = 0 ]; then
  print_usage
  exit
fi

COMMAND=$1
case $COMMAND in
  #hdfs commands
  namenode|secondarynamenode|datanode|dfs|dfsadmin|fsck|balancer)
    echo "DEPRECATED: Use of this script to execute hdfs command is deprecated."
    echo "Instead use the hdfs command for it."
    echo ""
    #try to locate hdfs and if present, delegate to it.  
    if [ -f "${HADOOP_HDFS_HOME}"/bin/hdfs ]; then
      exec "${HADOOP_HDFS_HOME}"/bin/hdfs $*
    elif [ -f "${HADOOP_HOME}"/bin/hdfs ]; then
      exec "${HADOOP_HOME}"/bin/hdfs $*
    else
      echo "HDFS not found."
      exit
    fi
    ;;

  #mapred commands  
  mradmin|jobtracker|tasktracker|pipes|job|queue)
    echo "DEPRECATED: Use of this script to execute mapred command is deprecated."
    echo "Instead use the mapred command for it."
    echo ""
    #try to locate mapred and if present, delegate to it.
    if [ -f "${HADOOP_MAPRED_HOME}"/bin/mapred ]; then
      exec "${HADOOP_MAPRED_HOME}"/bin/mapred $*
    elif [ -f "${HADOOP_HOME}"/bin/mapred ]; then
      exec "${HADOOP_HOME}"/bin/mapred $* 
    else
      echo "MAPRED not found."
      exit
    fi
    ;;

  classpath)
    if $cygwin; then
      CLASSPATH=`cygpath -p -w "$CLASSPATH"`
    fi
    echo $CLASSPATH
    exit
    ;;

  #core commands  
  *)
    # the core commands
    if [ "$COMMAND" = "fs" ] ; then
      CLASS=org.apache.hadoop.fs.FsShell
      HADOOP_OPTS="$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
    elif [ "$COMMAND" = "distcp" ] ; then
      CLASS=org.apache.hadoop.tools.DistCp
      CLASSPATH=${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 $HADOOP_CLIENT_OPTS"
    else
      CLASS=$COMMAND
    fi
    shift
    
    if $cygwin; then
      CLASSPATH=`cygpath -p -w "$CLASSPATH"`
    fi
    export CLASSPATH=$CLASSPATH
    exec "$JAVA" $JAVA_HEAP_MAX $HADOOP_OPTS $CLASS "$@"
    ;;

esac