46 lines
1.7 KiB
Ruby
46 lines
1.7 KiB
Ruby
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#!/usr/bin/env hbase-jruby
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# Copyright 2011 The Apache Software Foundation
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#
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# Licensed to the Apache Software Foundation (ASF) under one or more
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# contributor license agreements. See the NOTICE file distributed with this
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# work for additional information regarding copyright ownership. The ASF
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# licenses this file to you under the Apache License, Version 2.0 (the
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# "License"); you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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# Prints the hostname of the machine running the active master.
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include Java
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import org.apache.hadoop.hbase.HBaseConfiguration
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import org.apache.hadoop.hbase.ServerName
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import org.apache.hadoop.hbase.zookeeper.ZKUtil
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import org.apache.hadoop.hbase.zookeeper.ZooKeeperWatcher
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# disable debug/info logging on this script for clarity
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log_level = org.apache.log4j.Level::ERROR
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org.apache.log4j.Logger.getLogger('org.apache.hadoop.hbase').setLevel(log_level)
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org.apache.log4j.Logger.getLogger('org.apache.zookeeper').setLevel(log_level)
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config = HBaseConfiguration.create
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zk = ZooKeeperWatcher.new(config, 'get-active-master', nil)
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begin
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master_address = ZKUtil.getData(zk, zk.masterAddressZNode)
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if master_address
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puts ServerName.parseVersionedServerName(master_address).getHostname()
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else
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puts 'Master not running'
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end
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ensure
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zk.close()
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end
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