#!/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.
#

# Starts the master on the machine this script is executed on.

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

. "$bin/spark-config.sh"

if [ -f "${SPARK_CONF_DIR}/spark-env.sh" ]; then
  . "${SPARK_CONF_DIR}/spark-env.sh"
fi

if [ "$SPARK_MASTER_PORT" = "" ]; then
  SPARK_MASTER_PORT=7077
fi

if [ "$SPARK_MASTER_IP" = "" ]; then
  SPARK_MASTER_IP=`hostname`
fi

if [ "$SPARK_MASTER_WEBUI_PORT" = "" ]; then
  SPARK_MASTER_WEBUI_PORT=8080
fi

# Set SPARK_PUBLIC_DNS so the master report the correct webUI address to the slaves
if [ "$SPARK_PUBLIC_DNS" = "" ]; then
    # If we appear to be running on EC2, use the public address by default:
    # NOTE: ec2-metadata is installed on Amazon Linux AMI. Check based on that and hostname
    if command -v ec2-metadata > /dev/null || [[ `hostname` == *ec2.internal ]]; then
        export SPARK_PUBLIC_DNS=`wget -q -O - http://instance-data.ec2.internal/latest/meta-data/public-hostname`
    fi
fi

"$bin"/spark-daemon.sh start org.apache.spark.deploy.master.Master 1 --ip $SPARK_MASTER_IP --port $SPARK_MASTER_PORT --webui-port $SPARK_MASTER_WEBUI_PORT