hadoop/common/src/contrib/ec2/bin/launch-hadoop-slaves

#!/usr/bin/env bash

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#     http://www.apache.org/licenses/LICENSE-2.0
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# Launch an EC2 Hadoop slaves.

set -o errexit

if [ -z $1 ]; then
  echo "Cluster name required!"
  exit -1
fi

if [ -z $2 ]; then
  echo "Must specify the number of slaves to start."
  exit -1
fi

CLUSTER=$1
NO_INSTANCES=$2

# Import variables
bin=`dirname "$0"`
bin=`cd "$bin"; pwd`
. "$bin"/hadoop-ec2-env.sh

if [ ! -f $MASTER_IP_PATH ]; then
  echo "Must start Cluster Master first!"
  exit -1
fi

# Finding Hadoop image
AMI_IMAGE=`ec2-describe-images -a | grep $S3_BUCKET | grep $HADOOP_VERSION | grep $ARCH |grep available | awk '{print $2}'`
# to use private master hostname, substitute below with:
# MASTER_HOST=`cat $MASTER_PRIVATE_IP_PATH`
MASTER_HOST=`cat $MASTER_IP_PATH`
MASTER_ZONE=`cat $MASTER_ZONE_PATH`

# Substituting master hostname
sed -e "s|%MASTER_HOST%|$MASTER_HOST|" "$bin"/$USER_DATA_FILE > "$bin"/$USER_DATA_FILE.slave

# Start slaves
echo "Adding $1 node(s) to cluster group $CLUSTER with AMI $AMI_IMAGE"
ec2-run-instances $AMI_IMAGE -n "$NO_INSTANCES" -g "$CLUSTER" -k "$KEY_NAME" -f "$bin"/$USER_DATA_FILE.slave -t "$INSTANCE_TYPE" -z "$MASTER_ZONE" $KERNEL_ARG | grep INSTANCE | awk '{print $2}'

rm "$bin"/$USER_DATA_FILE.slave