#!/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.

bin=`which $0`
bin=`dirname ${bin}`
bin=`cd "$bin"; pwd`

DEFAULT_LIBEXEC_DIR="$bin"/../libexec

if [ -n "$HADOOP_HOME" ]; then
  DEFAULT_LIBEXEC_DIR="$HADOOP_HOME"/libexec
fi

HADOOP_LIBEXEC_DIR=${HADOOP_LIBEXEC_DIR:-$DEFAULT_LIBEXEC_DIR}
if [ -e ${HADOOP_LIBEXEC_DIR}/mapred-config.sh ]; then
  . ${HADOOP_LIBEXEC_DIR}/mapred-config.sh
else
  . "$bin/mapred-config.sh"
fi

function print_usage(){
  echo "Usage: mapred [--config confdir] COMMAND"
  echo "       where COMMAND is one of:"
  echo "  pipes                run a Pipes job"
  echo "  job                  manipulate MapReduce jobs"
  echo "  queue                get information regarding JobQueues"
  echo "  classpath            prints the class path needed for running"
  echo "                       mapreduce subcommands"
  echo "  historyserver        run job history servers as a standalone daemon"
  echo "  distcp <srcurl> <desturl> copy file or directories recursively"
  echo "  archive -archiveName NAME -p <parent path> <src>* <dest> create a hadoop archive"
  echo "  hsadmin              job history server admin interface"
  echo ""
  echo "Most commands print help when invoked w/o parameters."
}

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

COMMAND=$1
shift

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

if [ "$COMMAND" = "job" ] ; then
  CLASS=org.apache.hadoop.mapred.JobClient
  HADOOP_OPTS="$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" = "sampler" ] ; then
  CLASS=org.apache.hadoop.mapred.lib.InputSampler
  HADOOP_OPTS="$HADOOP_OPTS $HADOOP_CLIENT_OPTS"
elif [ "$COMMAND" = "classpath" ] ; then
  echo -n 
elif [ "$COMMAND" = "historyserver" ] ; then
  CLASS=org.apache.hadoop.mapreduce.v2.hs.JobHistoryServer
  HADOOP_OPTS="$HADOOP_OPTS -Dmapred.jobsummary.logger=${HADOOP_JHS_LOGGER:-INFO,console} $HADOOP_JOB_HISTORYSERVER_OPTS"
  if [ "$HADOOP_JOB_HISTORYSERVER_HEAPSIZE" != "" ]; then
    JAVA_HEAP_MAX="-Xmx""$HADOOP_JOB_HISTORYSERVER_HEAPSIZE""m"
  fi
elif [ "$COMMAND" = "mradmin" ] \
    || [ "$COMMAND" = "jobtracker" ] \
    || [ "$COMMAND" = "tasktracker" ] \
    || [ "$COMMAND" = "groups" ] ; then
  echo "Sorry, the $COMMAND command is no longer supported."
  echo "You may find similar functionality with the \"yarn\" shell command."
  print_usage
  exit 1
elif [ "$COMMAND" = "distcp" ] ; then
  CLASS=org.apache.hadoop.tools.DistCp
  CLASSPATH=${CLASSPATH}:${TOOL_PATH}
  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" = "hsadmin" ] ; then
  CLASS=org.apache.hadoop.mapreduce.v2.hs.client.HSAdmin
  HADOOP_OPTS="$HADOOP_OPTS $HADOOP_CLIENT_OPTS"
else
  echo $COMMAND - invalid command
  print_usage
  exit 1
fi

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

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

# Need YARN jars also
for f in $HADOOP_YARN_HOME/${YARN_DIR}/*.jar; do
  CLASSPATH=${CLASSPATH}:$f;
done

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

# add modules to CLASSPATH
for f in $HADOOP_MAPRED_HOME/modules/*.jar; do
  CLASSPATH=${CLASSPATH}:$f;
done

if [ "$COMMAND" = "classpath" ] ; then
  echo $CLASSPATH
  exit
fi

HADOOP_OPTS="$HADOOP_OPTS -Dhadoop.security.logger=${HADOOP_SECURITY_LOGGER:-INFO,NullAppender}"

export CLASSPATH
exec "$JAVA" -Dproc_$COMMAND $JAVA_HEAP_MAX $HADOOP_OPTS $CLASS "$@"