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.conf.Configuration;
27 import org.apache.hadoop.hbase.HBaseConfiguration;
28 import org.apache.hadoop.hbase.HBaseInterfaceAudience;
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.LimitedPrivate(HBaseInterfaceAudience.TOOLS)
35 public class ZKServerTool {
36 /**
37 * Run the tool.
38 * @param args Command line arguments.
39 */
40 public static void main(String args[]) {
41 Configuration conf = HBaseConfiguration.create();
42 // Note that we do not simply grab the property
43 // HConstants.ZOOKEEPER_QUORUM from the HBaseConfiguration because the
44 // user may be using a zoo.cfg file.
45 Properties zkProps = ZKConfig.makeZKProps(conf);
46 for (Entry<Object, Object> entry : zkProps.entrySet()) {
47 String key = entry.getKey().toString().trim();
48 String value = entry.getValue().toString().trim();
49 if (key.startsWith("server.")) {
50 String[] parts = value.split(":");
51 String host = parts[0];
52 System.out.println("ZK host:" + host);
53 }
54 }
55 }
56 }