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1   /**
2    * Copyright 2010 The Apache Software Foundation
3    *
4    * Licensed to the Apache Software Foundation (ASF) under one
5    * or more contributor license agreements.  See the NOTICE file
6    * distributed with this work for additional information
7    * regarding copyright ownership.  The ASF licenses this file
8    * to you under the Apache License, Version 2.0 (the
9    * "License"); you may not use this file except in compliance
10   * with the License.  You may obtain a copy of the License at
11   *
12   *     http://www.apache.org/licenses/LICENSE-2.0
13   *
14   * Unless required by applicable law or agreed to in writing, software
15   * distributed under the License is distributed on an "AS IS" BASIS,
16   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
17   * See the License for the specific language governing permissions and
18   * limitations under the License.
19   */
20  
21  package org.apache.hadoop.hbase.zookeeper;
22  
23  import java.util.Properties;
24  import java.util.Map.Entry;
25  
26  import org.apache.hadoop.conf.Configuration;
27  import org.apache.hadoop.hbase.HBaseConfiguration;
28  
29  /**
30   * Tool for reading ZooKeeper servers from HBase XML configuration and producing
31   * a line-by-line list for use by bash scripts.
32   */
33  public class ZKServerTool {
34    /**
35     * Run the tool.
36     * @param args Command line arguments.
37     */
38    public static void main(String args[]) {
39      Configuration conf = HBaseConfiguration.create();
40      // Note that we do not simply grab the property
41      // HConstants.ZOOKEEPER_QUORUM from the HBaseConfiguration because the
42      // user may be using a zoo.cfg file.
43      Properties zkProps = ZKConfig.makeZKProps(conf);
44      for (Entry<Object, Object> entry : zkProps.entrySet()) {
45        String key = entry.getKey().toString().trim();
46        String value = entry.getValue().toString().trim();
47        if (key.startsWith("server.")) {
48          String[] parts = value.split(":");
49          String host = parts[0];
50          System.out.println("ZK host:" + host);
51        }
52      }
53    }
54  }