View Javadoc

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 org.apache.hadoop.conf.Configuration;
24  import org.apache.hadoop.hbase.HBaseConfiguration;
25  import org.apache.hadoop.hbase.HConstants;
26  
27  import java.util.Map.Entry;
28  import java.util.Properties;
29  
30  /**
31   * Tool for reading ZooKeeper servers from HBase XML configuation and producing
32   * a line-by-line list for use by bash scripts.
33   */
34  public class ZKServerTool {
35    /**
36     * Run the tool.
37     * @param args Command line arguments. First arg is path to zookeepers file.
38     */
39    public static void main(String args[]) {
40      Configuration conf = HBaseConfiguration.create();
41      // Note that we do not simply grab the property
42      // HConstants.ZOOKEEPER_QUORUM from the HBaseConfiguration because the
43      // user may be using a zoo.cfg file.
44      Properties zkProps = HQuorumPeer.makeZKProps(conf);
45      for (Entry<Object, Object> entry : zkProps.entrySet()) {
46        String key = entry.getKey().toString().trim();
47        String value = entry.getValue().toString().trim();
48        if (key.startsWith("server.")) {
49          String[] parts = value.split(":");
50          String host = parts[0];
51          System.out.println(host);
52        }
53      }
54    }
55  }