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1   /**
2    *
3    * Licensed to the Apache Software Foundation (ASF) under one
4    * or more contributor license agreements.  See the NOTICE file
5    * distributed with this work for additional information
6    * regarding copyright ownership.  The ASF licenses this file
7    * to you under the Apache License, Version 2.0 (the
8    * "License"); you may not use this file except in compliance
9    * with the License.  You may obtain a copy of the License at
10   *
11   *     http://www.apache.org/licenses/LICENSE-2.0
12   *
13   * Unless required by applicable law or agreed to in writing, software
14   * distributed under the License is distributed on an "AS IS" BASIS,
15   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16   * See the License for the specific language governing permissions and
17   * limitations under the License.
18   */
19  
20  package org.apache.hadoop.hbase.zookeeper;
21  
22  import java.util.Properties;
23  import java.util.Map.Entry;
24  
25  import org.apache.hadoop.hbase.classification.InterfaceAudience;
26  import org.apache.hadoop.hbase.classification.InterfaceStability;
27  import org.apache.hadoop.conf.Configuration;
28  import org.apache.hadoop.hbase.HBaseConfiguration;
29  
30  /**
31   * Tool for reading ZooKeeper servers from HBase XML configuration and producing
32   * a line-by-line list for use by bash scripts.
33   */
34  @InterfaceAudience.Public
35  @InterfaceStability.Evolving
36  public class ZKServerTool {
37    /**
38     * Run the tool.
39     * @param args Command line arguments.
40     */
41    public static void main(String args[]) {
42      Configuration conf = HBaseConfiguration.create();
43      // Note that we do not simply grab the property
44      // HConstants.ZOOKEEPER_QUORUM from the HBaseConfiguration because the
45      // user may be using a zoo.cfg file.
46      Properties zkProps = ZKConfig.makeZKProps(conf);
47      for (Entry<Object, Object> entry : zkProps.entrySet()) {
48        String key = entry.getKey().toString().trim();
49        String value = entry.getValue().toString().trim();
50        if (key.startsWith("server.")) {
51          String[] parts = value.split(":");
52          String host = parts[0];
53          System.out.println("ZK host:" + host);
54        }
55      }
56    }
57  }