#!/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_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
#

bin=`dirname "$0"`
bin=`cd "$bin"; pwd`

. "$bin"/hadoop-config.sh

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

# if no args specified, show usage
if [ $# = 0 ]; then
  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 "  fsck                 run a DFS filesystem checking utility"
  echo "  fs                   run a generic filesystem user client"
  echo "  balancer             run a cluster balancing utility"
  echo "  jobtracker           run the MapReduce job Tracker node" 
  echo "  pipes                run a Pipes job"
  echo "  tasktracker          run a MapReduce task Tracker node" 
  echo "  job                  manipulate MapReduce jobs" 
  echo "  version              print the version"
  echo "  jar <jar>            run a jar file"
  echo "  distcp <srcurl> <desturl> copy file or directories recursively"
  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."
  exit 1
fi

# get arguments
COMMAND=$1
shift

if [ -f "${HADOOP_CONF_DIR}/hadoop-env.sh" ]; then
  . "${HADOOP_CONF_DIR}/hadoop-env.sh"
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}"
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

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

# for releases, add core hadoop jar & webapps to CLASSPATH
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

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

# add user-specified CLASSPATH last
if [ "$HADOOP_CLASSPATH" != "" ]; then
  CLASSPATH=${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

# cygwin path translation
if $cygwin; then
  CLASSPATH=`cygpath -p -w "$CLASSPATH"`
  HADOOP_HOME=`cygpath -d "$HADOOP_HOME"`
  HADOOP_LOG_DIR=`cygpath -d "$HADOOP_LOG_DIR"`
fi
# 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" ]; then
  JAVA_PLATFORM=`CLASSPATH=${CLASSPATH} ${JAVA} org.apache.hadoop.util.PlatformName | sed -e "s/ /_/g"`
  
  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
fi

# cygwin path translation
if $cygwin; then
  JAVA_LIBRARY_PATH=`cygpath -p "$JAVA_LIBRARY_PATH"`
fi
 
# restore ordinary behaviour
unset IFS

# figure out which class to run
if [ "$COMMAND" = "namenode" ] ; then
  CLASS='org.apache.hadoop.dfs.NameNode'
  HADOOP_OPTS="$HADOOP_OPTS $HADOOP_NAMENODE_OPTS"
elif [ "$COMMAND" = "secondarynamenode" ] ; then
  CLASS='org.apache.hadoop.dfs.SecondaryNameNode'
  HADOOP_OPTS="$HADOOP_OPTS $HADOOP_SECONDARYNAMENODE_OPTS"
elif [ "$COMMAND" = "datanode" ] ; then
  CLASS='org.apache.hadoop.dfs.DataNode'
  HADOOP_OPTS="$HADOOP_OPTS $HADOOP_DATANODE_OPTS"
elif [ "$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.dfs.DFSAdmin
  HADOOP_OPTS="$HADOOP_OPTS $HADOOP_CLIENT_OPTS"
elif [ "$COMMAND" = "fsck" ] ; then
  CLASS=org.apache.hadoop.dfs.DFSck
  HADOOP_OPTS="$HADOOP_OPTS $HADOOP_CLIENT_OPTS"
elif [ "$COMMAND" = "balancer" ] ; then
  CLASS=org.apache.hadoop.dfs.Balancer
  HADOOP_OPTS="$HADOOP_OPTS $HADOOP_BALANCER_OPTS"
elif [ "$COMMAND" = "jobtracker" ] ; then
  CLASS=org.apache.hadoop.mapred.JobTracker
  HADOOP_OPTS="$HADOOP_OPTS $HADOOP_JOBTRACKER_OPTS"
elif [ "$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
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.mapred.JobShell
elif [ "$COMMAND" = "distcp" ] ; then
  CLASS=org.apache.hadoop.util.CopyFiles
  HADOOP_OPTS="$HADOOP_OPTS $HADOOP_CLIENT_OPTS"
elif [ "$COMMAND" = "daemonlog" ] ; then
  CLASS=org.apache.hadoop.log.LogLevel
  HADOOP_OPTS="$HADOOP_OPTS $HADOOP_CLIENT_OPTS"
else
  CLASS=$COMMAND
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}"
if [ "x$JAVA_LIBRARY_PATH" != "x" ]; then
  HADOOP_OPTS="$HADOOP_OPTS -Djava.library.path=$JAVA_LIBRARY_PATH"
fi  

# run it
exec "$JAVA" $JAVA_HEAP_MAX $HADOOP_OPTS -classpath "$CLASSPATH" $CLASS "$@"