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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.concurrent.TimeUnit;</span> |
| <span class="source-line-no">021</span><span id="line-21">import org.apache.hadoop.hbase.util.Threads;</span> |
| <span class="source-line-no">022</span><span id="line-22">import org.apache.yetus.audience.InterfaceAudience;</span> |
| <span class="source-line-no">023</span><span id="line-23">import org.slf4j.Logger;</span> |
| <span class="source-line-no">024</span><span id="line-24">import org.slf4j.LoggerFactory;</span> |
| <span class="source-line-no">025</span><span id="line-25"></span> |
| <span class="source-line-no">026</span><span id="line-26">/**</span> |
| <span class="source-line-no">027</span><span id="line-27"> * Protection against zombie master. Started once Master accepts active responsibility and starts</span> |
| <span class="source-line-no">028</span><span id="line-28"> * taking over responsibilities. Allows a finite time window before giving up ownership.</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">class MasterInitializationMonitor extends Thread {</span> |
| <span class="source-line-no">032</span><span id="line-32"></span> |
| <span class="source-line-no">033</span><span id="line-33"> private static final Logger LOG = LoggerFactory.getLogger(MasterInitializationMonitor.class);</span> |
| <span class="source-line-no">034</span><span id="line-34"></span> |
| <span class="source-line-no">035</span><span id="line-35"> /** The amount of time in milliseconds to sleep before checking initialization status. */</span> |
| <span class="source-line-no">036</span><span id="line-36"> public static final String TIMEOUT_KEY = "hbase.master.initializationmonitor.timeout";</span> |
| <span class="source-line-no">037</span><span id="line-37"> public static final long TIMEOUT_DEFAULT = TimeUnit.MILLISECONDS.convert(15, TimeUnit.MINUTES);</span> |
| <span class="source-line-no">038</span><span id="line-38"></span> |
| <span class="source-line-no">039</span><span id="line-39"> /**</span> |
| <span class="source-line-no">040</span><span id="line-40"> * When timeout expired and initialization has not complete, call {@link System#exit(int)} when</span> |
| <span class="source-line-no">041</span><span id="line-41"> * true, do nothing otherwise.</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 static final String HALT_KEY = "hbase.master.initializationmonitor.haltontimeout";</span> |
| <span class="source-line-no">044</span><span id="line-44"> public static final boolean HALT_DEFAULT = false;</span> |
| <span class="source-line-no">045</span><span id="line-45"></span> |
| <span class="source-line-no">046</span><span id="line-46"> private final HMaster master;</span> |
| <span class="source-line-no">047</span><span id="line-47"> private final long timeout;</span> |
| <span class="source-line-no">048</span><span id="line-48"> private final boolean haltOnTimeout;</span> |
| <span class="source-line-no">049</span><span id="line-49"></span> |
| <span class="source-line-no">050</span><span id="line-50"> /** Creates a Thread that monitors the {@link #isInitialized()} state. */</span> |
| <span class="source-line-no">051</span><span id="line-51"> MasterInitializationMonitor(HMaster master) {</span> |
| <span class="source-line-no">052</span><span id="line-52"> super("MasterInitializationMonitor");</span> |
| <span class="source-line-no">053</span><span id="line-53"> this.master = master;</span> |
| <span class="source-line-no">054</span><span id="line-54"> this.timeout = master.getConfiguration().getLong(TIMEOUT_KEY, TIMEOUT_DEFAULT);</span> |
| <span class="source-line-no">055</span><span id="line-55"> this.haltOnTimeout = master.getConfiguration().getBoolean(HALT_KEY, HALT_DEFAULT);</span> |
| <span class="source-line-no">056</span><span id="line-56"> this.setDaemon(true);</span> |
| <span class="source-line-no">057</span><span id="line-57"> }</span> |
| <span class="source-line-no">058</span><span id="line-58"></span> |
| <span class="source-line-no">059</span><span id="line-59"> @Override</span> |
| <span class="source-line-no">060</span><span id="line-60"> public void run() {</span> |
| <span class="source-line-no">061</span><span id="line-61"> try {</span> |
| <span class="source-line-no">062</span><span id="line-62"> while (!master.isStopped() && master.isActiveMaster()) {</span> |
| <span class="source-line-no">063</span><span id="line-63"> Thread.sleep(timeout);</span> |
| <span class="source-line-no">064</span><span id="line-64"> if (master.isInitialized()) {</span> |
| <span class="source-line-no">065</span><span id="line-65"> LOG.debug("Initialization completed within allotted tolerance. Monitor exiting.");</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"> LOG.error("Master failed to complete initialization after " + timeout + "ms. Please"</span> |
| <span class="source-line-no">068</span><span id="line-68"> + " consider submitting a bug report including a thread dump of this process.");</span> |
| <span class="source-line-no">069</span><span id="line-69"> if (haltOnTimeout) {</span> |
| <span class="source-line-no">070</span><span id="line-70"> LOG.error("Zombie Master exiting. Thread dump to stdout");</span> |
| <span class="source-line-no">071</span><span id="line-71"> Threads.printThreadInfo(System.out, "Zombie HMaster");</span> |
| <span class="source-line-no">072</span><span id="line-72"> System.exit(-1);</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"> }</span> |
| <span class="source-line-no">076</span><span id="line-76"> } catch (InterruptedException ie) {</span> |
| <span class="source-line-no">077</span><span id="line-77"> LOG.trace("InitMonitor thread interrupted. Existing.");</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">}</span> |
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