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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.master;</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 java.util.ArrayList;</span> |
| <span class="source-line-no">021</span><span id="line-21">import java.util.Collections;</span> |
| <span class="source-line-no">022</span><span id="line-22">import java.util.List;</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.ServerName;</span> |
| <span class="source-line-no">025</span><span id="line-25">import org.apache.hadoop.hbase.util.ReflectionUtils;</span> |
| <span class="source-line-no">026</span><span id="line-26">import org.apache.hadoop.net.DNSToSwitchMapping;</span> |
| <span class="source-line-no">027</span><span id="line-27">import org.apache.hadoop.net.ScriptBasedMapping;</span> |
| <span class="source-line-no">028</span><span id="line-28">import org.apache.yetus.audience.InterfaceAudience;</span> |
| <span class="source-line-no">029</span><span id="line-29"></span> |
| <span class="source-line-no">030</span><span id="line-30">/**</span> |
| <span class="source-line-no">031</span><span id="line-31"> * Wrapper over the rack resolution utility in Hadoop. The rack resolution utility in Hadoop does</span> |
| <span class="source-line-no">032</span><span id="line-32"> * resolution from hosts to the racks they belong to.</span> |
| <span class="source-line-no">033</span><span id="line-33"> */</span> |
| <span class="source-line-no">034</span><span id="line-34">@InterfaceAudience.Private</span> |
| <span class="source-line-no">035</span><span id="line-35">public class RackManager {</span> |
| <span class="source-line-no">036</span><span id="line-36"> public static final String UNKNOWN_RACK = "Unknown Rack";</span> |
| <span class="source-line-no">037</span><span id="line-37"></span> |
| <span class="source-line-no">038</span><span id="line-38"> private DNSToSwitchMapping switchMapping;</span> |
| <span class="source-line-no">039</span><span id="line-39"></span> |
| <span class="source-line-no">040</span><span id="line-40"> public RackManager() {</span> |
| <span class="source-line-no">041</span><span id="line-41"> }</span> |
| <span class="source-line-no">042</span><span id="line-42"></span> |
| <span class="source-line-no">043</span><span id="line-43"> public RackManager(Configuration conf) {</span> |
| <span class="source-line-no">044</span><span id="line-44"> switchMapping = ReflectionUtils.instantiateWithCustomCtor(</span> |
| <span class="source-line-no">045</span><span id="line-45"> conf.getClass("hbase.util.ip.to.rack.determiner", ScriptBasedMapping.class,</span> |
| <span class="source-line-no">046</span><span id="line-46"> DNSToSwitchMapping.class).getName(),</span> |
| <span class="source-line-no">047</span><span id="line-47"> new Class<?>[] { Configuration.class }, new Object[] { conf });</span> |
| <span class="source-line-no">048</span><span id="line-48"> }</span> |
| <span class="source-line-no">049</span><span id="line-49"></span> |
| <span class="source-line-no">050</span><span id="line-50"> /**</span> |
| <span class="source-line-no">051</span><span id="line-51"> * Get the name of the rack containing a server, according to the DNS to switch mapping.</span> |
| <span class="source-line-no">052</span><span id="line-52"> * @param server the server for which to get the rack name</span> |
| <span class="source-line-no">053</span><span id="line-53"> * @return the rack name of the server</span> |
| <span class="source-line-no">054</span><span id="line-54"> */</span> |
| <span class="source-line-no">055</span><span id="line-55"> public String getRack(ServerName server) {</span> |
| <span class="source-line-no">056</span><span id="line-56"> if (server == null) {</span> |
| <span class="source-line-no">057</span><span id="line-57"> return UNKNOWN_RACK;</span> |
| <span class="source-line-no">058</span><span id="line-58"> }</span> |
| <span class="source-line-no">059</span><span id="line-59"> // just a note - switchMapping caches results (at least the implementation should unless the</span> |
| <span class="source-line-no">060</span><span id="line-60"> // resolution is really a lightweight process)</span> |
| <span class="source-line-no">061</span><span id="line-61"> List<String> racks = switchMapping.resolve(Collections.singletonList(server.getHostname()));</span> |
| <span class="source-line-no">062</span><span id="line-62"> if (racks != null && !racks.isEmpty()) {</span> |
| <span class="source-line-no">063</span><span id="line-63"> return racks.get(0);</span> |
| <span class="source-line-no">064</span><span id="line-64"> }</span> |
| <span class="source-line-no">065</span><span id="line-65"></span> |
| <span class="source-line-no">066</span><span id="line-66"> return UNKNOWN_RACK;</span> |
| <span class="source-line-no">067</span><span id="line-67"> }</span> |
| <span class="source-line-no">068</span><span id="line-68"></span> |
| <span class="source-line-no">069</span><span id="line-69"> /**</span> |
| <span class="source-line-no">070</span><span id="line-70"> * Same as {@link #getRack(ServerName)} except that a list is passed</span> |
| <span class="source-line-no">071</span><span id="line-71"> * @param servers list of servers we're requesting racks information for</span> |
| <span class="source-line-no">072</span><span id="line-72"> * @return list of racks for the given list of servers</span> |
| <span class="source-line-no">073</span><span id="line-73"> */</span> |
| <span class="source-line-no">074</span><span id="line-74"> public List<String> getRack(List<ServerName> servers) {</span> |
| <span class="source-line-no">075</span><span id="line-75"> // just a note - switchMapping caches results (at least the implementation should unless the</span> |
| <span class="source-line-no">076</span><span id="line-76"> // resolution is really a lightweight process)</span> |
| <span class="source-line-no">077</span><span id="line-77"> List<String> serversAsString = new ArrayList<>(servers.size());</span> |
| <span class="source-line-no">078</span><span id="line-78"> for (ServerName server : servers) {</span> |
| <span class="source-line-no">079</span><span id="line-79"> serversAsString.add(server.getHostname());</span> |
| <span class="source-line-no">080</span><span id="line-80"> }</span> |
| <span class="source-line-no">081</span><span id="line-81"> List<String> racks = switchMapping.resolve(serversAsString);</span> |
| <span class="source-line-no">082</span><span id="line-82"> return racks;</span> |
| <span class="source-line-no">083</span><span id="line-83"> }</span> |
| <span class="source-line-no">084</span><span id="line-84">}</span> |
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