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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.Collections;</span> |
| <span class="source-line-no">021</span><span id="line-21">import java.util.HashMap;</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 java.util.Map;</span> |
| <span class="source-line-no">024</span><span id="line-24">import java.util.Optional;</span> |
| <span class="source-line-no">025</span><span id="line-25">import org.apache.hadoop.hbase.ServerName;</span> |
| <span class="source-line-no">026</span><span id="line-26">import org.apache.hadoop.hbase.procedure2.Procedure;</span> |
| <span class="source-line-no">027</span><span id="line-27">import org.apache.hadoop.hbase.procedure2.ProcedureEvent;</span> |
| <span class="source-line-no">028</span><span id="line-28">import org.apache.hadoop.hbase.procedure2.ProcedureSuspendedException;</span> |
| <span class="source-line-no">029</span><span id="line-29">import org.apache.yetus.audience.InterfaceAudience;</span> |
| <span class="source-line-no">030</span><span id="line-30"></span> |
| <span class="source-line-no">031</span><span id="line-31">/**</span> |
| <span class="source-line-no">032</span><span id="line-32"> * help assign and release a worker for each remote task. For each worker, concurrent running task</span> |
| <span class="source-line-no">033</span><span id="line-33"> * should be no more than maxTasks. If a task failed to acquire a worker, it will suspend and wait</span> |
| <span class="source-line-no">034</span><span id="line-34"> * for workers available.</span> |
| <span class="source-line-no">035</span><span id="line-35"> */</span> |
| <span class="source-line-no">036</span><span id="line-36">@InterfaceAudience.Private</span> |
| <span class="source-line-no">037</span><span id="line-37">public class WorkerAssigner implements ServerListener {</span> |
| <span class="source-line-no">038</span><span id="line-38"> private final Map<ServerName, Integer> currentWorkers = new HashMap<>();</span> |
| <span class="source-line-no">039</span><span id="line-39"> private final MasterServices master;</span> |
| <span class="source-line-no">040</span><span id="line-40"> private final ProcedureEvent<?> event;</span> |
| <span class="source-line-no">041</span><span id="line-41"> private final int maxTasks;</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 WorkerAssigner(MasterServices master, int maxTasks, ProcedureEvent<?> event) {</span> |
| <span class="source-line-no">044</span><span id="line-44"> this.maxTasks = maxTasks;</span> |
| <span class="source-line-no">045</span><span id="line-45"> this.master = master;</span> |
| <span class="source-line-no">046</span><span id="line-46"> this.event = event;</span> |
| <span class="source-line-no">047</span><span id="line-47"> // ServerManager might be null in a test context where we are mocking; allow for this</span> |
| <span class="source-line-no">048</span><span id="line-48"> ServerManager sm = this.master.getServerManager();</span> |
| <span class="source-line-no">049</span><span id="line-49"> if (sm != null) {</span> |
| <span class="source-line-no">050</span><span id="line-50"> sm.registerListener(this);</span> |
| <span class="source-line-no">051</span><span id="line-51"> }</span> |
| <span class="source-line-no">052</span><span id="line-52"> }</span> |
| <span class="source-line-no">053</span><span id="line-53"></span> |
| <span class="source-line-no">054</span><span id="line-54"> public synchronized ServerName acquire(Procedure<?> proc) throws ProcedureSuspendedException {</span> |
| <span class="source-line-no">055</span><span id="line-55"> List<ServerName> serverList = master.getServerManager().getOnlineServersList();</span> |
| <span class="source-line-no">056</span><span id="line-56"> Collections.shuffle(serverList);</span> |
| <span class="source-line-no">057</span><span id="line-57"> Optional<ServerName> worker = serverList.stream()</span> |
| <span class="source-line-no">058</span><span id="line-58"> .filter(</span> |
| <span class="source-line-no">059</span><span id="line-59"> serverName -> !currentWorkers.containsKey(serverName) || currentWorkers.get(serverName) > 0)</span> |
| <span class="source-line-no">060</span><span id="line-60"> .findAny();</span> |
| <span class="source-line-no">061</span><span id="line-61"> if (worker.isPresent()) {</span> |
| <span class="source-line-no">062</span><span id="line-62"> ServerName sn = worker.get();</span> |
| <span class="source-line-no">063</span><span id="line-63"> currentWorkers.compute(sn, (serverName,</span> |
| <span class="source-line-no">064</span><span id="line-64"> availableWorker) -> availableWorker == null ? maxTasks - 1 : availableWorker - 1);</span> |
| <span class="source-line-no">065</span><span id="line-65"> return sn;</span> |
| <span class="source-line-no">066</span><span id="line-66"> } else {</span> |
| <span class="source-line-no">067</span><span id="line-67"> event.suspend();</span> |
| <span class="source-line-no">068</span><span id="line-68"> event.suspendIfNotReady(proc);</span> |
| <span class="source-line-no">069</span><span id="line-69"> throw new ProcedureSuspendedException();</span> |
| <span class="source-line-no">070</span><span id="line-70"> }</span> |
| <span class="source-line-no">071</span><span id="line-71"> }</span> |
| <span class="source-line-no">072</span><span id="line-72"></span> |
| <span class="source-line-no">073</span><span id="line-73"> public synchronized void release(ServerName serverName) {</span> |
| <span class="source-line-no">074</span><span id="line-74"> currentWorkers.compute(serverName, (k, v) -> v == null ? null : v + 1);</span> |
| <span class="source-line-no">075</span><span id="line-75"> if (!event.isReady()) {</span> |
| <span class="source-line-no">076</span><span id="line-76"> event.wake(master.getMasterProcedureExecutor().getEnvironment().getProcedureScheduler());</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"> @Override</span> |
| <span class="source-line-no">081</span><span id="line-81"> public synchronized void serverAdded(ServerName worker) {</span> |
| <span class="source-line-no">082</span><span id="line-82"> if (!event.isReady()) {</span> |
| <span class="source-line-no">083</span><span id="line-83"> event.wake(master.getMasterProcedureExecutor().getEnvironment().getProcedureScheduler());</span> |
| <span class="source-line-no">084</span><span id="line-84"> }</span> |
| <span class="source-line-no">085</span><span id="line-85"> }</span> |
| <span class="source-line-no">086</span><span id="line-86"></span> |
| <span class="source-line-no">087</span><span id="line-87"> public synchronized void addUsedWorker(ServerName worker) {</span> |
| <span class="source-line-no">088</span><span id="line-88"> // load used worker when master restart</span> |
| <span class="source-line-no">089</span><span id="line-89"> currentWorkers.compute(worker, (serverName,</span> |
| <span class="source-line-no">090</span><span id="line-90"> availableWorker) -> availableWorker == null ? maxTasks - 1 : availableWorker - 1);</span> |
| <span class="source-line-no">091</span><span id="line-91"> }</span> |
| <span class="source-line-no">092</span><span id="line-92"></span> |
| <span class="source-line-no">093</span><span id="line-93"> public Integer getAvailableWorker(ServerName serverName) {</span> |
| <span class="source-line-no">094</span><span id="line-94"> return currentWorkers.get(serverName);</span> |
| <span class="source-line-no">095</span><span id="line-95"> }</span> |
| <span class="source-line-no">096</span><span id="line-96">}</span> |
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| </pre> |
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