#!/usr/bin/env hbase-jruby
#
# 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.

# Prints the hostname of the machine running the active master.

include Java
java_import org.apache.hadoop.hbase.HBaseConfiguration
java_import org.apache.hadoop.hbase.ServerName
java_import org.apache.hadoop.hbase.zookeeper.ZKWatcher
java_import org.apache.hadoop.hbase.zookeeper.MasterAddressTracker

# disable debug/info logging on this script for clarity
log_level = 'ERROR'
org.apache.hadoop.hbase.logging.Log4jUtils.setAllLevels('org.apache.hadoop.hbase', log_level)
org.apache.hadoop.hbase.logging.Log4jUtils.setAllLevels('org.apache.zookeeper', log_level)
org.apache.hadoop.hbase.logging.Log4jUtils.setAllLevels('org.apache.hadoop', log_level)

config = HBaseConfiguration.create

zk = ZKWatcher.new(config, 'get-active-master', nil)
begin
  puts MasterAddressTracker.getMasterAddress(zk).getHostname
ensure
  zk.close
end
