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#!/bin/bash

# Licensed 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.

# This init script installs a cloud-sql-proxy on each node in the cluster, and

# uses that proxy to expose TCP proxies of one or more CloudSQL instances.

# One of these instances is used for the clusters Hive Metastore.

# Do not use "set -x" to avoid printing passwords in clear in the logs

set -euo pipefail

# Whether to configure the Hive metastore to point to a Cloud SQL database.

# This is not required for Hive & Spark I/O.

HIVE_USER_DEFAULT='${sql_user}'

HIVE_PASSWORD_DEFAULT='${sql_password}'

SQL_USER_DEFAULT='root'

SQL_PASSWORD_DEFAULT='${sql_password}'

readonly enable_cloud_sql_metastore="$(/usr/share/google/get_metadata_value attributes/enable-cloud-sql-hive-metastore || echo 'true')"

# Whether to enable the proxy on workers. This is not necessary for the

# Metastore, but is required for Hive & Spark I/O.

readonly enable_proxy_on_workers="$(/usr/share/google/get_metadata_value attributes/enable-cloud-sql-proxy-on-workers || echo 'true')"

# Database user to use to access metastore.

readonly db_hive_user="$(/usr/share/google/get_metadata_value attributes/db-hive-user || echo 'hive')"

readonly db_hive_user="$(/usr/share/google/get_metadata_value attributes/db-hive-user || echo $HIVE_USER_DEFAULT)"

readonly db_admin_user="$(/usr/share/google/get_metadata_value attributes/db-admin-user || echo 'root')"

readonly db_admin_user="$(/usr/share/google/get_metadata_value attributes/db-admin-user || echo $SQL_USER_DEFAULT)"

readonly kms_key_uri="$(/usr/share/google/get_metadata_value attributes/kms-key-uri)"

# Database admin user password used to create the metastore database and user.

readonly db_admin_password_uri="$(/usr/share/google/get_metadata_value attributes/db-admin-password-uri)"

if [[ -n "${db_admin_password_uri}" ]]; then

if [[ -n "$${db_admin_password_uri}" ]]; then

# Decrypt password

readonly db_admin_password="$(gsutil cat $db_admin_password_uri | \

gcloud kms decrypt \

--ciphertext-file - \

--plaintext-file - \

--key $kms_key_uri)"

else

readonly db_admin_password=''

readonly db_admin_password=$SQL_PASSWORD_DEFAULT

if [ "${db_admin_password}" == "" ]; then

if [ "$${db_admin_password}" == "" ]; then

readonly db_admin_password_parameter=""

else

readonly db_admin_password_parameter="-p${db_admin_password}"

readonly db_admin_password_parameter="-p$${db_admin_password}"

# Database password to use to access metastore.

readonly db_hive_password_uri="$(/usr/share/google/get_metadata_value attributes/db-hive-password-uri)"

if [[ -n "${db_hive_password_uri}" ]]; then

if [[ -n "$${db_hive_password_uri}" ]]; then

# Decrypt password

readonly db_hive_password="$(gsutil cat $db_hive_password_uri | \

gcloud kms decrypt \

--ciphertext-file - \

--plaintext-file - \

--key $kms_key_uri)"

else

readonly db_hive_password='hive-password'

readonly db_hive_password=$HIVE_PASSWORD_DEFAULT

if [ "${db_hive_password}" == "" ]; then

if [ "$${db_hive_password}" == "" ]; then

readonly db_hive_password_parameter=""

else

readonly db_hive_password_parameter="-p${db_hive_password}"

readonly db_hive_password_parameter="-p$${db_hive_password}"

readonly PROXY_DIR='/var/run/cloud_sql_proxy'

readonly PROXY_BIN='/usr/local/bin/cloud_sql_proxy'

readonly INIT_SCRIPT='/usr/lib/systemd/system/cloud-sql-proxy.service'

readonly ADDITIONAL_INSTANCES_KEY='attributes/additional-cloud-sql-instances'

# Dataproc master nodes information

readonly DATAPROC_MASTER=$(/usr/share/google/get_metadata_value attributes/dataproc-master)

function err() {

echo "[$(date +'%Y-%m-%dT%H:%M:%S%z')]: $@" >&2

return 1

}

# Helper to run any command with Fibonacci backoff.

# If all retries fail, returns last attempt's exit code.

# Args: "$@" is the command to run.

function run_with_retries() {

local retry_backoff=(1 1 2 3 5 8 13 21 34 55 89 144)

local -a cmd=("$@")

echo "About to run '${cmd[*]}' with retries..."

echo "About to run '$${cmd[*]}' with retries..."

local update_succeeded=0

for ((i = 0; i < ${#retry_backoff[@]}; i++)); do

for ((i = 0; i < $${#retry_backoff[@]}; i++)); do

if "${cmd[@]}"; then

if "$${cmd[@]}"; then

update_succeeded=1

break

else

local sleep_time=${retry_backoff[$i]}

local sleep_time=$${retry_backoff[$i]}

echo "'${cmd[*]}' attempt $(( $i + 1 )) failed! Sleeping ${sleep_time}." >&2

echo "'$${cmd[*]}' attempt $(( $i + 1 )) failed! Sleeping $${sleep_time}." >&2

sleep ${sleep_time}

sleep $${sleep_time}

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#!/bin/bash
# Copyright 2016 Google, Inc.
#
# Licensed 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.

# This init script installs a cloud-sql-proxy on each node in the cluster, and
# uses that proxy to expose TCP proxies of one or more CloudSQL instances.
# One of these instances is used for the clusters Hive Metastore.

# Do not use "set -x" to avoid printing passwords in clear in the logs
set -euo pipefail

# Whether to configure the Hive metastore to point to a Cloud SQL database.
# This is not required for Hive & Spark I/O.
readonly enable_cloud_sql_metastore="$(/usr/share/google/get_metadata_value attributes/enable-cloud-sql-hive-metastore || echo 'true')"

# Whether to enable the proxy on workers. This is not necessary for the
# Metastore, but is required for Hive & Spark I/O.
readonly enable_proxy_on_workers="$(/usr/share/google/get_metadata_value attributes/enable-cloud-sql-proxy-on-workers || echo 'true')"

# Database user to use to access metastore.
readonly db_hive_user="$(/usr/share/google/get_metadata_value attributes/db-hive-user || echo 'hive')"

readonly db_admin_user="$(/usr/share/google/get_metadata_value attributes/db-admin-user || echo 'root')"

readonly kms_key_uri="$(/usr/share/google/get_metadata_value attributes/kms-key-uri)"

# Database admin user password used to create the metastore database and user.
readonly db_admin_password_uri="$(/usr/share/google/get_metadata_value attributes/db-admin-password-uri)"
if [[ -n "${db_admin_password_uri}" ]]; then
  # Decrypt password
  readonly db_admin_password="$(gsutil cat $db_admin_password_uri | \
    gcloud kms decrypt \
    --ciphertext-file - \
    --plaintext-file - \
    --key $kms_key_uri)"
else
  readonly db_admin_password=''
fi
if [ "${db_admin_password}" == "" ]; then
    readonly db_admin_password_parameter=""
else
    readonly db_admin_password_parameter="-p${db_admin_password}"
fi

# Database password to use to access metastore.
readonly db_hive_password_uri="$(/usr/share/google/get_metadata_value attributes/db-hive-password-uri)"
if [[ -n "${db_hive_password_uri}" ]]; then
  # Decrypt password
  readonly db_hive_password="$(gsutil cat $db_hive_password_uri | \
    gcloud kms decrypt \
    --ciphertext-file - \
    --plaintext-file - \
    --key $kms_key_uri)"
else
  readonly db_hive_password='hive-password'
fi
if [ "${db_hive_password}" == "" ]; then
    readonly db_hive_password_parameter=""
else
    readonly db_hive_password_parameter="-p${db_hive_password}"
fi

readonly PROXY_DIR='/var/run/cloud_sql_proxy'
readonly PROXY_BIN='/usr/local/bin/cloud_sql_proxy'
readonly INIT_SCRIPT='/usr/lib/systemd/system/cloud-sql-proxy.service'
readonly ADDITIONAL_INSTANCES_KEY='attributes/additional-cloud-sql-instances'

# Dataproc master nodes information
readonly DATAPROC_MASTER=$(/usr/share/google/get_metadata_value attributes/dataproc-master)

function err() {
  echo "[$(date +'%Y-%m-%dT%H:%M:%S%z')]: $@" >&2
  return 1
}

# Helper to run any command with Fibonacci backoff.
# If all retries fail, returns last attempt's exit code.
# Args: "$@" is the command to run.
function run_with_retries() {
  local retry_backoff=(1 1 2 3 5 8 13 21 34 55 89 144)
  local -a cmd=("$@")
  echo "About to run '${cmd[*]}' with retries..."

local update_succeeded=0
  for ((i = 0; i < ${#retry_backoff[@]}; i++)); do
    if "${cmd[@]}"; then
      update_succeeded=1
      break
    else
      local sleep_time=${retry_backoff[$i]}
      echo "'${cmd[*]}' attempt $(( $i + 1 )) failed! Sleeping ${sleep_time}." >&2
      sleep ${sleep_time}
    fi
  done

if ! (( ${update_succeeded} )); then
    echo "Final attempt of '${cmd[*]}'..."
    # Let any final error propagate all the way out to any error traps.
    "${cmd[@]}"
  fi
}

if [[ -n "${additional_instances}" ]]; then
    # Pass additional instances straight to the proxy.
    proxy_instances_flags+=" -instances_metadata=instance/${ADDITIONAL_INSTANCES_KEY}"
  fi
}

function install_cloud_sql_proxy() {
  # Install proxy.
  wget -q https://dl.google.com/cloudsql/cloud_sql_proxy.linux.amd64 \
    || err 'Unable to download cloud-sql-proxy binary'
  mv cloud_sql_proxy.linux.amd64 ${PROXY_BIN}
  chmod +x ${PROXY_BIN}

mkdir -p ${PROXY_DIR}

# Install proxy as systemd service for reboot tolerance.
  cat << EOF > ${INIT_SCRIPT}
[Unit]
Description=Google Cloud SQL Proxy
After=local-fs.target network-online.target
After=google.service
Before=shutdown.target

[Service]
Type=simple
ExecStart=${PROXY_BIN} \
  -dir=${PROXY_DIR} \
  ${proxy_instances_flags}

[Install]
WantedBy=multi-user.target
EOF
  chmod a+rw ${INIT_SCRIPT}
  systemctl enable cloud-sql-proxy
  systemctl start cloud-sql-proxy \
    || err 'Unable to start cloud-sql-proxy service'
    
  if [[ $enable_cloud_sql_metastore = "true" ]]; then
    run_with_retries nc -zv localhost ${metastore_proxy_port}
  fi

echo 'Cloud SQL Proxy installation succeeded' >&2

if [[ $enable_cloud_sql_metastore = "true" ]]; then
    # Update hive-site.xml
    cat << EOF > hive-template.xml
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
<configuration>
  <property>
    <name>javax.jdo.option.ConnectionURL</name>
    <value>jdbc:mysql://localhost:${metastore_proxy_port}/${metastore_db}</value>
    <description>the URL of the MySQL database</description>
  </property>
  <property>
    <name>javax.jdo.option.ConnectionUserName</name>
    <value>${db_hive_user}</value>
  </property>
  <property>
    <name>javax.jdo.option.ConnectionPassword</name>
    <value>${db_hive_password}</value>
  </property>
</configuration>
EOF

bdconfig merge_configurations \
    --configuration_file /etc/hive/conf/hive-site.xml \
    --source_configuration_file hive-template.xml \
    --clobber
fi
}

function configure_sql_client(){
  # Configure mysql client to talk to metastore
  cat << EOF > /etc/mysql/conf.d/cloud-sql-proxy.cnf
[client]
protocol = tcp
port = ${metastore_proxy_port}
EOF

# Check if metastore is initialized.
  if ! mysql -u "${db_hive_user}" "${db_hive_password_parameter}" -e ''; then
    mysql -u "${db_admin_user}" "${db_admin_password_parameter}" -e \
      "CREATE USER '${db_hive_user}' IDENTIFIED BY '${db_hive_password}';"
  fi
  if mysql -u "${db_hive_user}" "${db_hive_password_parameter}" -e "use ${metastore_db}"; then
    # Extract the warehouse URI.
    HIVE_WAREHOURSE_URI=$(mysql -u "${db_hive_user}" "${db_hive_password_parameter}" -Nse \
      "SELECT DB_LOCATION_URI FROM ${metastore_db}.DBS WHERE NAME = 'default';")
    bdconfig set_property \
      --name 'hive.metastore.warehouse.dir' \
      --value "${HIVE_WAREHOURSE_URI}" \
      --configuration_file /etc/hive/conf/hive-site.xml \
      --clobber
  else
    # Initialize database with current warehouse URI.
    mysql -u "${db_admin_user}" "${db_admin_password_parameter}" -e \
      "CREATE DATABASE ${metastore_db}; \
       GRANT ALL PRIVILEGES ON ${metastore_db}.* TO '${db_hive_user}';"
    /usr/lib/hive/bin/schematool -dbType mysql -initSchema \
      || err 'Failed to set mysql schema.'
  fi

run_with_retries run_validation
}

function run_validation() {
  if ( systemctl is-enabled --quiet hive-metastore ); then
    # Start metastore back up.
    systemctl restart hive-metastore \
      || err 'Unable to start hive-metastore service'
  else
    echo "Service hive-metastore is not loaded"
  fi

# Check that metastore schema is compatible.
  /usr/lib/hive/bin/schematool -dbType mysql -info || \
      err 'Run /usr/lib/hive/bin/schematool -dbType mysql -upgradeSchemaFrom <schema-version> to upgrade the schema. Note that this may break Hive metastores that depend on the old schema'

# Validate it's functioning.
  if ! timeout 60s beeline -u jdbc:hive2://localhost:10000 -e 'SHOW TABLES;' >& /dev/null; then
    err 'Failed to bring up Cloud SQL Metastore'
  else
    echo 'Cloud SQL Hive Metastore initialization succeeded' >&2
  fi

}

function configure_hive_warehouse_dir(){
  # Wait for master 0 to create the metastore db if necessary.
  run_with_retries run_validation

HIVE_WAREHOURSE_URI=$(beeline -u jdbc:hive2://localhost:10000 \
    -e "describe database default;" \
    | sed '4q;d' | cut -d "|" -f4 | tr -d '[:space:]')

echo "Hive warehouse uri: $HIVE_WAREHOURSE_URI"

bdconfig set_property \
    --name 'hive.metastore.warehouse.dir' \
    --value "${HIVE_WAREHOURSE_URI}" \
    --configuration_file /etc/hive/conf/hive-site.xml \
    --clobber
  echo "Updated hive warehouse dir"
}

function main() {

local role
  role="$(/usr/share/google/get_metadata_value attributes/dataproc-role)"

local metastore_instance
  metastore_instance="$(/usr/share/google/get_metadata_value attributes/hive-metastore-instance || true)"

local additional_instances
  additional_instances="$(/usr/share/google/get_metadata_value ${ADDITIONAL_INSTANCES_KEY} || true)"

local metastore_db
  metastore_db="$(/usr/share/google/get_metadata_value attributes/hive-metastore-db || true)"

# Name of CloudSQL instance to use for the metastore. Must already exist.
  # Uncomment to hard code an instance. Metadata will still take precedence.
  metastore_instance_default= # my-project:my-region:my-instance
  metastore_instance="${metastore_instance:-${metastore_instance_default}}"

# Name of MySQL database to use for the metastore. Will be created if
  # it doesn't exist.

metastore_db="${metastore_db:-hive_metastore}"

local metastore_proxy_port
  metastore_proxy_port="$(/usr/share/google/get_metadata_value attributes/metastore-proxy-port || echo '3306')"

# Validation
  if [[ $enable_cloud_sql_metastore != "true" ]] && [[ -z "${additional_instances}" ]]; then
    err 'No Cloud SQL instances to proxy'
  fi

local proxy_instances_flags
  proxy_instances_flags=''
  configure_proxy_flags

if [[ "${role}" == 'Master' ]]; then
    # Disable Hive Metastore and MySql Server.
    if [[ $enable_cloud_sql_metastore = "true" ]]; then
      if ( systemctl is-enabled --quiet hive-metastore ); then
        # Stop hive-metastore if it is enabled
        systemctl stop hive-metastore
      else
        echo "Service hive-metastore is not enabled"
      fi
      if ( systemctl is-enabled --quiet mysql ); then
        systemctl stop mysql
        systemctl disable mysql
      else
        echo "Service mysql is not enabled"
      fi
    fi
    install_cloud_sql_proxy
    if [[ $enable_cloud_sql_metastore = "true" ]]; then
      if [[ "${HOSTNAME}" == "${DATAPROC_MASTER}" ]]; then
        # Initialize metastore db instance and set hive.metastore.warehouse.dir
        # on master 0.
        configure_sql_client
      else
        # Set hive.metastore.warehouse.dir only on other masters.
        configure_hive_warehouse_dir
      fi
    fi
  else
    # This part runs on workers.
    # Run installation on workers when enable_proxy_on_workers is set.
    if [[ $enable_proxy_on_workers = "true" ]]; then
      install_cloud_sql_proxy
    fi
  fi

}

main

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# Do not use "set -x" to avoid printing passwords in clear in the logs
set -euo pipefail

# Whether to configure the Hive metastore to point to a Cloud SQL database.
# This is not required for Hive & Spark I/O.

HIVE_USER_DEFAULT='${sql_user}'
HIVE_PASSWORD_DEFAULT='${sql_password}'
SQL_USER_DEFAULT='root'
SQL_PASSWORD_DEFAULT='${sql_password}'

readonly enable_cloud_sql_metastore="$(/usr/share/google/get_metadata_value attributes/enable-cloud-sql-hive-metastore || echo 'true')"

# Database user to use to access metastore.
readonly db_hive_user="$(/usr/share/google/get_metadata_value attributes/db-hive-user || echo $HIVE_USER_DEFAULT)"

readonly db_admin_user="$(/usr/share/google/get_metadata_value attributes/db-admin-user || echo $SQL_USER_DEFAULT)"

readonly kms_key_uri="$(/usr/share/google/get_metadata_value attributes/kms-key-uri)"

# Database admin user password used to create the metastore database and user.
readonly db_admin_password_uri="$(/usr/share/google/get_metadata_value attributes/db-admin-password-uri)"
if [[ -n "$${db_admin_password_uri}" ]]; then
  # Decrypt password
  readonly db_admin_password="$(gsutil cat $db_admin_password_uri | \
    gcloud kms decrypt \
    --ciphertext-file - \
    --plaintext-file - \
    --key $kms_key_uri)"
else
  readonly db_admin_password=$SQL_PASSWORD_DEFAULT
fi
if [ "$${db_admin_password}" == "" ]; then
    readonly db_admin_password_parameter=""
else
    readonly db_admin_password_parameter="-p$${db_admin_password}"
fi

# Database password to use to access metastore.
readonly db_hive_password_uri="$(/usr/share/google/get_metadata_value attributes/db-hive-password-uri)"
if [[ -n "$${db_hive_password_uri}" ]]; then
  # Decrypt password
  readonly db_hive_password="$(gsutil cat $db_hive_password_uri | \
    gcloud kms decrypt \
    --ciphertext-file - \
    --plaintext-file - \
    --key $kms_key_uri)"
else
  readonly db_hive_password=$HIVE_PASSWORD_DEFAULT
fi
if [ "$${db_hive_password}" == "" ]; then
    readonly db_hive_password_parameter=""
else
    readonly db_hive_password_parameter="-p$${db_hive_password}"
fi

function err() {
  echo "[$(date +'%Y-%m-%dT%H:%M:%S%z')]: $@" >&2
  return 1
}

local update_succeeded=0
  for ((i = 0; i < $${#retry_backoff[@]}; i++)); do
    if "$${cmd[@]}"; then
      update_succeeded=1
      break
    else
      local sleep_time=$${retry_backoff[$i]}
      echo "'$${cmd[*]}' attempt $(( $i + 1 )) failed! Sleeping $${sleep_time}." >&2
      sleep $${sleep_time}
    fi
  done

if ! (( $${update_succeeded} )); then
    echo "Final attempt of '$${cmd[*]}'..."
    # Let any final error propagate all the way out to any error traps.
    "$${cmd[@]}"
  fi
}

if [[ -n "$${additional_instances}" ]]; then
    # Pass additional instances straight to the proxy.
    proxy_instances_flags+=" -instances_metadata=instance/$${ADDITIONAL_INSTANCES_KEY}"
  fi
}

mkdir -p $${PROXY_DIR}

# Install proxy as systemd service for reboot tolerance.
  cat << EOF > $${INIT_SCRIPT}
[Unit]
Description=Google Cloud SQL Proxy
After=local-fs.target network-online.target
After=google.service
Before=shutdown.target

[Service]
Type=simple
ExecStart=$${PROXY_BIN} \
  -dir=$${PROXY_DIR} \
  $${proxy_instances_flags}

[Install]
WantedBy=multi-user.target
EOF
  chmod a+rw $${INIT_SCRIPT}
  systemctl enable cloud-sql-proxy
  systemctl start cloud-sql-proxy \
    || err 'Unable to start cloud-sql-proxy service'

run_with_retries nc -zv localhost $${metastore_proxy_port}

echo 'Cloud SQL Proxy installation succeeded' >&2

if [[ $enable_cloud_sql_metastore = "true" ]]; then
    # Update hive-site.xml
    cat << EOF > hive-template.xml
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
<configuration>
  <property>
    <name>javax.jdo.option.ConnectionURL</name>
    <value>jdbc:mysql://localhost:$${metastore_proxy_port}/$${metastore_db}</value>
    <description>the URL of the MySQL database</description>
  </property>
  <property>
    <name>javax.jdo.option.ConnectionUserName</name>
    <value>$${db_hive_user}</value>
  </property>
  <property>
    <name>javax.jdo.option.ConnectionPassword</name>
    <value>$${db_hive_password}</value>
  </property>
</configuration>
EOF

bdconfig merge_configurations \
    --configuration_file /etc/hive/conf/hive-site.xml \
    --source_configuration_file hive-template.xml \
    --clobber
fi
}

function configure_sql_client(){
  # Configure mysql client to talk to metastore
  cat << EOF > /etc/mysql/conf.d/cloud-sql-proxy.cnf
[client]
protocol = tcp
port = $${metastore_proxy_port}
EOF

# Check if metastore is initialized.
  if ! mysql -u "$${db_hive_user}" "$${db_hive_password_parameter}" -e ''; then
    mysql -u "$${db_admin_user}" "$${db_admin_password_parameter}" -e \
      "CREATE USER '$${db_hive_user}' IDENTIFIED BY '$${db_hive_password}';"
  fi
  if mysql -u "$${db_hive_user}" "$${db_hive_password_parameter}" -e "use $${metastore_db}"; then
    # Extract the warehouse URI.
    HIVE_WAREHOURSE_URI=$(mysql -u "$${db_hive_user}" "$${db_hive_password_parameter}" -Nse \
      "SELECT DB_LOCATION_URI FROM $${metastore_db}.DBS WHERE NAME = 'default';")
    bdconfig set_property \
      --name 'hive.metastore.warehouse.dir' \
      --value "$${HIVE_WAREHOURSE_URI}" \
      --configuration_file /etc/hive/conf/hive-site.xml \
      --clobber
  else
    # Initialize database with current warehouse URI.
    mysql -u "$${db_admin_user}" "$${db_admin_password_parameter}" -e \
      "CREATE DATABASE $${metastore_db}; \
       GRANT ALL PRIVILEGES ON $${metastore_db}.* TO '$${db_hive_user}';"
    /usr/lib/hive/bin/schematool -dbType mysql -initSchema \
      || err 'Failed to set mysql schema.'
  fi

if ( systemctl is-enabled --quiet hive-metastore ); then
    # Start metastore back up.
    systemctl start hive-metastore \
      || err 'Unable to start hive-metastore service'
  else
    echo "Service hive-metastore is not loaded"
  fi

# Validate it's functioning.
  if ! hive -e 'SHOW TABLES;' >& /dev/null; then
    err 'Failed to bring up Cloud SQL Metastore'
  fi
  echo 'Cloud SQL Hive Metastore initialization succeeded' >&2

}

function main() {

local role
  role="$(/usr/share/google/get_metadata_value attributes/dataproc-role)"

local metastore_instance
  metastore_instance="$(/usr/share/google/get_metadata_value attributes/hive-metastore-instance || true)"

local additional_instances
  additional_instances="$(/usr/share/google/get_metadata_value $${ADDITIONAL_INSTANCES_KEY} || true)"

local metastore_db
  metastore_db="$(/usr/share/google/get_metadata_value attributes/hive-metastore-db || true)"

# Name of CloudSQL instance to use for the metastore. Must already exist.
  # Uncomment to hard code an instance. Metadata will still take precedence.
  metastore_instance_default= # my-project:my-region:my-instance
  metastore_instance="$${metastore_instance:-$${metastore_instance_default}}"

# Name of MySQL database to use for the metastore. Will be created if
  # it doesn't exist.

metastore_db="$${metastore_db:-hive_metastore}"

local metastore_proxy_port
  metastore_proxy_port="$(/usr/share/google/get_metadata_value attributes/metastore-proxy-port || echo '3306')"

# Validation
  if [[ $enable_cloud_sql_metastore != "true" ]] && [[ -z "$${additional_instances}" ]]; then
    err 'No Cloud SQL instances to proxy'
  fi

local proxy_instances_flags
  proxy_instances_flags=''
  configure_proxy_flags

if [[ "$${role}" == 'Master' ]]; then
    # Disable Hive Metastore and MySql Server.
    if [[ $enable_cloud_sql_metastore = "true" ]]; then
      if ( systemctl is-enabled --quiet hive-metastore ); then
        # Stop hive-metastore if it is enabled
        systemctl stop hive-metastore
      else
        echo "Service hive-metastore is not enabled"
      fi
      systemctl stop mysql
      systemctl disable mysql
    fi
    install_cloud_sql_proxy
    if [[ $enable_cloud_sql_metastore = "true" ]]; then
      configure_sql_client
    fi
  else
    # This part runs on workers.
    # Run installation on workers when enable_proxy_on_workers is set.
    if [[ $enable_proxy_on_workers = "true" ]]; then
      install_cloud_sql_proxy
    fi
  fi

}

main