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 }