#!/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`

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

function print_usage(){
  echo "Usage: mapred [--config confdir] COMMAND"
  echo "       where COMMAND is one of:"
  echo "  mradmin              run a Map-Reduce admin client"
  echo "  jobtracker           run the MapReduce job Tracker node" 
  echo "  tasktracker          run a MapReduce task Tracker node" 
  echo "  pipes                run a Pipes job"
  echo "  job                  manipulate MapReduce jobs"
  echo "  queue                get information regarding JobQueues"
  echo "  groups               get the groups which users belong to"
  echo ""
  echo "Most commands print help when invoked w/o parameters."
}

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

COMMAND=$1
shift

if [ "$COMMAND" = "mradmin" ] ; then
  CLASS=org.apache.hadoop.mapred.tools.MRAdmin
  HADOOP_OPTS="$HADOOP_OPTS $HADOOP_CLIENT_OPTS"
elif [ "$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 [ "$COMMAND" = "queue" ] ; then
  CLASS=org.apache.hadoop.mapred.JobQueueClient
elif [ "$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" = "groups" ] ; then
  CLASS=org.apache.hadoop.mapred.tools.GetGroups
  HADOOP_OPTS="$HADOOP_OPTS $HADOOP_CLIENT_OPTS"
else
  echo $COMMAND - invalid command
  print_usage
  exit
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 "$HADOOP_PREFIX/share/hadoop/mapreduce/webapps" ]; then
  CLASSPATH=${CLASSPATH}:$HADOOP_PREFIX/share/hadoop/mapreduce
fi
for f in $HADOOP_MAPRED_HOME/share/hadoop-mapreduce/*.jar; do
  CLASSPATH=${CLASSPATH}:$f;
done

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

if $cygwin; then
  CLASSPATH=`cygpath -p -w "$CLASSPATH"`
fi
export CLASSPATH
exec "$JAVA" $JAVA_HEAP_MAX $HADOOP_OPTS $CLASS "$@"