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| <pre><span class="source-line-no">001</span><span id="line-1">/*</span> |
| <span class="source-line-no">002</span><span id="line-2"> * Licensed to the Apache Software Foundation (ASF) under one</span> |
| <span class="source-line-no">003</span><span id="line-3"> * or more contributor license agreements. See the NOTICE file</span> |
| <span class="source-line-no">004</span><span id="line-4"> * distributed with this work for additional information</span> |
| <span class="source-line-no">005</span><span id="line-5"> * regarding copyright ownership. The ASF licenses this file</span> |
| <span class="source-line-no">006</span><span id="line-6"> * to you under the Apache License, Version 2.0 (the</span> |
| <span class="source-line-no">007</span><span id="line-7"> * "License"); you may not use this file except in compliance</span> |
| <span class="source-line-no">008</span><span id="line-8"> * with the License. You may obtain a copy of the License at</span> |
| <span class="source-line-no">009</span><span id="line-9"> *</span> |
| <span class="source-line-no">010</span><span id="line-10"> * http://www.apache.org/licenses/LICENSE-2.0</span> |
| <span class="source-line-no">011</span><span id="line-11"> *</span> |
| <span class="source-line-no">012</span><span id="line-12"> * Unless required by applicable law or agreed to in writing, software</span> |
| <span class="source-line-no">013</span><span id="line-13"> * distributed under the License is distributed on an "AS IS" BASIS,</span> |
| <span class="source-line-no">014</span><span id="line-14"> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span> |
| <span class="source-line-no">015</span><span id="line-15"> * See the License for the specific language governing permissions and</span> |
| <span class="source-line-no">016</span><span id="line-16"> * limitations under the License.</span> |
| <span class="source-line-no">017</span><span id="line-17"> */</span> |
| <span class="source-line-no">018</span><span id="line-18">package org.apache.hadoop.hbase.util;</span> |
| <span class="source-line-no">019</span><span id="line-19"></span> |
| <span class="source-line-no">020</span><span id="line-20">import edu.umd.cs.findbugs.annotations.NonNull;</span> |
| <span class="source-line-no">021</span><span id="line-21">import java.lang.reflect.Method;</span> |
| <span class="source-line-no">022</span><span id="line-22">import java.net.UnknownHostException;</span> |
| <span class="source-line-no">023</span><span id="line-23">import org.apache.hadoop.conf.Configuration;</span> |
| <span class="source-line-no">024</span><span id="line-24">import org.apache.hadoop.hbase.HBaseInterfaceAudience;</span> |
| <span class="source-line-no">025</span><span id="line-25">import org.apache.yetus.audience.InterfaceAudience;</span> |
| <span class="source-line-no">026</span><span id="line-26"></span> |
| <span class="source-line-no">027</span><span id="line-27">/**</span> |
| <span class="source-line-no">028</span><span id="line-28"> * Wrapper around Hadoop's DNS class to hide reflection.</span> |
| <span class="source-line-no">029</span><span id="line-29"> */</span> |
| <span class="source-line-no">030</span><span id="line-30">@InterfaceAudience.Private</span> |
| <span class="source-line-no">031</span><span id="line-31">@edu.umd.cs.findbugs.annotations.SuppressWarnings(value = "REC_CATCH_EXCEPTION",</span> |
| <span class="source-line-no">032</span><span id="line-32"> justification = "If exception, presume HAS_NEW_DNS_GET_DEFAULT_HOST_API false")</span> |
| <span class="source-line-no">033</span><span id="line-33">public final class DNS {</span> |
| <span class="source-line-no">034</span><span id="line-34"> // key to the config parameter of server hostname</span> |
| <span class="source-line-no">035</span><span id="line-35"> // the specification of server hostname is optional. The hostname should be resolvable from</span> |
| <span class="source-line-no">036</span><span id="line-36"> // both master and region server</span> |
| <span class="source-line-no">037</span><span id="line-37"> @InterfaceAudience.LimitedPrivate(HBaseInterfaceAudience.CONFIG)</span> |
| <span class="source-line-no">038</span><span id="line-38"> public static final String UNSAFE_RS_HOSTNAME_KEY = "hbase.unsafe.regionserver.hostname";</span> |
| <span class="source-line-no">039</span><span id="line-39"> @InterfaceAudience.LimitedPrivate(HBaseInterfaceAudience.CONFIG)</span> |
| <span class="source-line-no">040</span><span id="line-40"> public static final String MASTER_HOSTNAME_KEY = "hbase.master.hostname";</span> |
| <span class="source-line-no">041</span><span id="line-41"></span> |
| <span class="source-line-no">042</span><span id="line-42"> private static boolean HAS_NEW_DNS_GET_DEFAULT_HOST_API;</span> |
| <span class="source-line-no">043</span><span id="line-43"> private static Method GET_DEFAULT_HOST_METHOD;</span> |
| <span class="source-line-no">044</span><span id="line-44"></span> |
| <span class="source-line-no">045</span><span id="line-45"> /**</span> |
| <span class="source-line-no">046</span><span id="line-46"> * Hostname configuration key</span> |
| <span class="source-line-no">047</span><span id="line-47"> * @deprecated since 2.4.0 and will be removed in 4.0.0. Use {@link DNS#UNSAFE_RS_HOSTNAME_KEY}</span> |
| <span class="source-line-no">048</span><span id="line-48"> * instead.</span> |
| <span class="source-line-no">049</span><span id="line-49"> * @see <a href="https://issues.apache.org/jira/browse/HBASE-24667">HBASE-24667</a></span> |
| <span class="source-line-no">050</span><span id="line-50"> */</span> |
| <span class="source-line-no">051</span><span id="line-51"> @Deprecated</span> |
| <span class="source-line-no">052</span><span id="line-52"> @InterfaceAudience.LimitedPrivate(HBaseInterfaceAudience.CONFIG)</span> |
| <span class="source-line-no">053</span><span id="line-53"> public static final String RS_HOSTNAME_KEY = "hbase.regionserver.hostname";</span> |
| <span class="source-line-no">054</span><span id="line-54"></span> |
| <span class="source-line-no">055</span><span id="line-55"> static {</span> |
| <span class="source-line-no">056</span><span id="line-56"> try {</span> |
| <span class="source-line-no">057</span><span id="line-57"> GET_DEFAULT_HOST_METHOD = org.apache.hadoop.net.DNS.class.getMethod("getDefaultHost",</span> |
| <span class="source-line-no">058</span><span id="line-58"> String.class, String.class, boolean.class);</span> |
| <span class="source-line-no">059</span><span id="line-59"> HAS_NEW_DNS_GET_DEFAULT_HOST_API = true;</span> |
| <span class="source-line-no">060</span><span id="line-60"> } catch (Exception e) {</span> |
| <span class="source-line-no">061</span><span id="line-61"> HAS_NEW_DNS_GET_DEFAULT_HOST_API = false; // FindBugs: Causes REC_CATCH_EXCEPTION. Suppressed</span> |
| <span class="source-line-no">062</span><span id="line-62"> }</span> |
| <span class="source-line-no">063</span><span id="line-63"> }</span> |
| <span class="source-line-no">064</span><span id="line-64"></span> |
| <span class="source-line-no">065</span><span id="line-65"> public enum ServerType {</span> |
| <span class="source-line-no">066</span><span id="line-66"> MASTER("master"),</span> |
| <span class="source-line-no">067</span><span id="line-67"> REGIONSERVER("regionserver");</span> |
| <span class="source-line-no">068</span><span id="line-68"></span> |
| <span class="source-line-no">069</span><span id="line-69"> private final String name;</span> |
| <span class="source-line-no">070</span><span id="line-70"></span> |
| <span class="source-line-no">071</span><span id="line-71"> private ServerType(String name) {</span> |
| <span class="source-line-no">072</span><span id="line-72"> this.name = name;</span> |
| <span class="source-line-no">073</span><span id="line-73"> }</span> |
| <span class="source-line-no">074</span><span id="line-74"></span> |
| <span class="source-line-no">075</span><span id="line-75"> public String getName() {</span> |
| <span class="source-line-no">076</span><span id="line-76"> return name;</span> |
| <span class="source-line-no">077</span><span id="line-77"> }</span> |
| <span class="source-line-no">078</span><span id="line-78"> }</span> |
| <span class="source-line-no">079</span><span id="line-79"></span> |
| <span class="source-line-no">080</span><span id="line-80"> private DNS() {</span> |
| <span class="source-line-no">081</span><span id="line-81"> }</span> |
| <span class="source-line-no">082</span><span id="line-82"></span> |
| <span class="source-line-no">083</span><span id="line-83"> /**</span> |
| <span class="source-line-no">084</span><span id="line-84"> * Wrapper around DNS.getDefaultHost(String, String), calling DNS.getDefaultHost(String, String,</span> |
| <span class="source-line-no">085</span><span id="line-85"> * boolean) when available.</span> |
| <span class="source-line-no">086</span><span id="line-86"> * @param strInterface The network interface to query.</span> |
| <span class="source-line-no">087</span><span id="line-87"> * @param nameserver The DNS host name.</span> |
| <span class="source-line-no">088</span><span id="line-88"> * @return The default host names associated with IPs bound to the network interface.</span> |
| <span class="source-line-no">089</span><span id="line-89"> */</span> |
| <span class="source-line-no">090</span><span id="line-90"> public static String getDefaultHost(String strInterface, String nameserver)</span> |
| <span class="source-line-no">091</span><span id="line-91"> throws UnknownHostException {</span> |
| <span class="source-line-no">092</span><span id="line-92"> if (HAS_NEW_DNS_GET_DEFAULT_HOST_API) {</span> |
| <span class="source-line-no">093</span><span id="line-93"> try {</span> |
| <span class="source-line-no">094</span><span id="line-94"> // Hadoop-2.8 includes a String, String, boolean variant of getDefaultHost</span> |
| <span class="source-line-no">095</span><span id="line-95"> // which properly handles multi-homed systems with Kerberos.</span> |
| <span class="source-line-no">096</span><span id="line-96"> return (String) GET_DEFAULT_HOST_METHOD.invoke(null, strInterface, nameserver, true);</span> |
| <span class="source-line-no">097</span><span id="line-97"> } catch (Exception e) {</span> |
| <span class="source-line-no">098</span><span id="line-98"> // If we can't invoke the method as it should exist, throw an exception</span> |
| <span class="source-line-no">099</span><span id="line-99"> throw new RuntimeException("Failed to invoke DNS.getDefaultHost via reflection", e);</span> |
| <span class="source-line-no">100</span><span id="line-100"> }</span> |
| <span class="source-line-no">101</span><span id="line-101"> } else {</span> |
| <span class="source-line-no">102</span><span id="line-102"> return org.apache.hadoop.net.DNS.getDefaultHost(strInterface, nameserver);</span> |
| <span class="source-line-no">103</span><span id="line-103"> }</span> |
| <span class="source-line-no">104</span><span id="line-104"> }</span> |
| <span class="source-line-no">105</span><span id="line-105"></span> |
| <span class="source-line-no">106</span><span id="line-106"> /**</span> |
| <span class="source-line-no">107</span><span id="line-107"> * Get the configured hostname for a given ServerType. Gets the default hostname if not specified</span> |
| <span class="source-line-no">108</span><span id="line-108"> * in the configuration.</span> |
| <span class="source-line-no">109</span><span id="line-109"> * @param conf Configuration to look up.</span> |
| <span class="source-line-no">110</span><span id="line-110"> * @param serverType ServerType to look up in the configuration for overrides.</span> |
| <span class="source-line-no">111</span><span id="line-111"> */</span> |
| <span class="source-line-no">112</span><span id="line-112"> public static String getHostname(@NonNull Configuration conf, @NonNull ServerType serverType)</span> |
| <span class="source-line-no">113</span><span id="line-113"> throws UnknownHostException {</span> |
| <span class="source-line-no">114</span><span id="line-114"> String hostname;</span> |
| <span class="source-line-no">115</span><span id="line-115"> switch (serverType) {</span> |
| <span class="source-line-no">116</span><span id="line-116"> case MASTER:</span> |
| <span class="source-line-no">117</span><span id="line-117"> hostname = conf.get(MASTER_HOSTNAME_KEY);</span> |
| <span class="source-line-no">118</span><span id="line-118"> break;</span> |
| <span class="source-line-no">119</span><span id="line-119"> case REGIONSERVER:</span> |
| <span class="source-line-no">120</span><span id="line-120"> hostname = conf.get(UNSAFE_RS_HOSTNAME_KEY);</span> |
| <span class="source-line-no">121</span><span id="line-121"> break;</span> |
| <span class="source-line-no">122</span><span id="line-122"> default:</span> |
| <span class="source-line-no">123</span><span id="line-123"> hostname = null;</span> |
| <span class="source-line-no">124</span><span id="line-124"> }</span> |
| <span class="source-line-no">125</span><span id="line-125"> if (hostname == null || hostname.isEmpty()) {</span> |
| <span class="source-line-no">126</span><span id="line-126"> return Strings.domainNamePointerToHostName(</span> |
| <span class="source-line-no">127</span><span id="line-127"> getDefaultHost(conf.get("hbase." + serverType.getName() + ".dns.interface", "default"),</span> |
| <span class="source-line-no">128</span><span id="line-128"> conf.get("hbase." + serverType.getName() + ".dns.nameserver", "default")));</span> |
| <span class="source-line-no">129</span><span id="line-129"> } else {</span> |
| <span class="source-line-no">130</span><span id="line-130"> return hostname;</span> |
| <span class="source-line-no">131</span><span id="line-131"> }</span> |
| <span class="source-line-no">132</span><span id="line-132"> }</span> |
| <span class="source-line-no">133</span><span id="line-133">}</span> |
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| </pre> |
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