#!/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.

# List running clusters.

set -o errexit

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

# Finding Hadoop clusters
CLUSTERS=`ec2-describe-instances | awk '"RESERVATION" == $1 && $4 ~ /-master$/, "INSTANCE" == $1' | tr '\n' '\t' | grep running | cut -f4 | rev | cut -d'-' -f2- | rev`

[ -z "$CLUSTERS" ] && echo "No running clusters." && exit 0

echo "Running Hadoop clusters:"
echo "$CLUSTERS"