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| <pre><span class="sourceLineNo">001</span>/*<a name="line.1"></a> |
| <span class="sourceLineNo">002</span> * Licensed to the Apache Software Foundation (ASF) under one<a name="line.2"></a> |
| <span class="sourceLineNo">003</span> * or more contributor license agreements. See the NOTICE file<a name="line.3"></a> |
| <span class="sourceLineNo">004</span> * distributed with this work for additional information<a name="line.4"></a> |
| <span class="sourceLineNo">005</span> * regarding copyright ownership. The ASF licenses this file<a name="line.5"></a> |
| <span class="sourceLineNo">006</span> * to you under the Apache License, Version 2.0 (the<a name="line.6"></a> |
| <span class="sourceLineNo">007</span> * "License"); you may not use this file except in compliance<a name="line.7"></a> |
| <span class="sourceLineNo">008</span> * with the License. You may obtain a copy of the License at<a name="line.8"></a> |
| <span class="sourceLineNo">009</span> *<a name="line.9"></a> |
| <span class="sourceLineNo">010</span> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.10"></a> |
| <span class="sourceLineNo">011</span> *<a name="line.11"></a> |
| <span class="sourceLineNo">012</span> * Unless required by applicable law or agreed to in writing, software<a name="line.12"></a> |
| <span class="sourceLineNo">013</span> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.13"></a> |
| <span class="sourceLineNo">014</span> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.14"></a> |
| <span class="sourceLineNo">015</span> * See the License for the specific language governing permissions and<a name="line.15"></a> |
| <span class="sourceLineNo">016</span> * limitations under the License.<a name="line.16"></a> |
| <span class="sourceLineNo">017</span> */<a name="line.17"></a> |
| <span class="sourceLineNo">018</span>package org.apache.hadoop.hbase.master;<a name="line.18"></a> |
| <span class="sourceLineNo">019</span><a name="line.19"></a> |
| <span class="sourceLineNo">020</span>import java.util.concurrent.TimeUnit;<a name="line.20"></a> |
| <span class="sourceLineNo">021</span>import org.apache.hadoop.hbase.util.Threads;<a name="line.21"></a> |
| <span class="sourceLineNo">022</span>import org.apache.yetus.audience.InterfaceAudience;<a name="line.22"></a> |
| <span class="sourceLineNo">023</span>import org.slf4j.Logger;<a name="line.23"></a> |
| <span class="sourceLineNo">024</span>import org.slf4j.LoggerFactory;<a name="line.24"></a> |
| <span class="sourceLineNo">025</span><a name="line.25"></a> |
| <span class="sourceLineNo">026</span>/**<a name="line.26"></a> |
| <span class="sourceLineNo">027</span> * Protection against zombie master. Started once Master accepts active responsibility and starts<a name="line.27"></a> |
| <span class="sourceLineNo">028</span> * taking over responsibilities. Allows a finite time window before giving up ownership.<a name="line.28"></a> |
| <span class="sourceLineNo">029</span> */<a name="line.29"></a> |
| <span class="sourceLineNo">030</span>@InterfaceAudience.Private<a name="line.30"></a> |
| <span class="sourceLineNo">031</span>class MasterInitializationMonitor extends Thread {<a name="line.31"></a> |
| <span class="sourceLineNo">032</span><a name="line.32"></a> |
| <span class="sourceLineNo">033</span> private static final Logger LOG = LoggerFactory.getLogger(MasterInitializationMonitor.class);<a name="line.33"></a> |
| <span class="sourceLineNo">034</span><a name="line.34"></a> |
| <span class="sourceLineNo">035</span> /** The amount of time in milliseconds to sleep before checking initialization status. */<a name="line.35"></a> |
| <span class="sourceLineNo">036</span> public static final String TIMEOUT_KEY = "hbase.master.initializationmonitor.timeout";<a name="line.36"></a> |
| <span class="sourceLineNo">037</span> public static final long TIMEOUT_DEFAULT = TimeUnit.MILLISECONDS.convert(15, TimeUnit.MINUTES);<a name="line.37"></a> |
| <span class="sourceLineNo">038</span><a name="line.38"></a> |
| <span class="sourceLineNo">039</span> /**<a name="line.39"></a> |
| <span class="sourceLineNo">040</span> * When timeout expired and initialization has not complete, call {@link System#exit(int)} when<a name="line.40"></a> |
| <span class="sourceLineNo">041</span> * true, do nothing otherwise.<a name="line.41"></a> |
| <span class="sourceLineNo">042</span> */<a name="line.42"></a> |
| <span class="sourceLineNo">043</span> public static final String HALT_KEY = "hbase.master.initializationmonitor.haltontimeout";<a name="line.43"></a> |
| <span class="sourceLineNo">044</span> public static final boolean HALT_DEFAULT = false;<a name="line.44"></a> |
| <span class="sourceLineNo">045</span><a name="line.45"></a> |
| <span class="sourceLineNo">046</span> private final HMaster master;<a name="line.46"></a> |
| <span class="sourceLineNo">047</span> private final long timeout;<a name="line.47"></a> |
| <span class="sourceLineNo">048</span> private final boolean haltOnTimeout;<a name="line.48"></a> |
| <span class="sourceLineNo">049</span><a name="line.49"></a> |
| <span class="sourceLineNo">050</span> /** Creates a Thread that monitors the {@link #isInitialized()} state. */<a name="line.50"></a> |
| <span class="sourceLineNo">051</span> MasterInitializationMonitor(HMaster master) {<a name="line.51"></a> |
| <span class="sourceLineNo">052</span> super("MasterInitializationMonitor");<a name="line.52"></a> |
| <span class="sourceLineNo">053</span> this.master = master;<a name="line.53"></a> |
| <span class="sourceLineNo">054</span> this.timeout = master.getConfiguration().getLong(TIMEOUT_KEY, TIMEOUT_DEFAULT);<a name="line.54"></a> |
| <span class="sourceLineNo">055</span> this.haltOnTimeout = master.getConfiguration().getBoolean(HALT_KEY, HALT_DEFAULT);<a name="line.55"></a> |
| <span class="sourceLineNo">056</span> this.setDaemon(true);<a name="line.56"></a> |
| <span class="sourceLineNo">057</span> }<a name="line.57"></a> |
| <span class="sourceLineNo">058</span><a name="line.58"></a> |
| <span class="sourceLineNo">059</span> @Override<a name="line.59"></a> |
| <span class="sourceLineNo">060</span> public void run() {<a name="line.60"></a> |
| <span class="sourceLineNo">061</span> try {<a name="line.61"></a> |
| <span class="sourceLineNo">062</span> while (!master.isStopped() && master.isActiveMaster()) {<a name="line.62"></a> |
| <span class="sourceLineNo">063</span> Thread.sleep(timeout);<a name="line.63"></a> |
| <span class="sourceLineNo">064</span> if (master.isInitialized()) {<a name="line.64"></a> |
| <span class="sourceLineNo">065</span> LOG.debug("Initialization completed within allotted tolerance. Monitor exiting.");<a name="line.65"></a> |
| <span class="sourceLineNo">066</span> } else {<a name="line.66"></a> |
| <span class="sourceLineNo">067</span> LOG.error("Master failed to complete initialization after " + timeout + "ms. Please"<a name="line.67"></a> |
| <span class="sourceLineNo">068</span> + " consider submitting a bug report including a thread dump of this process.");<a name="line.68"></a> |
| <span class="sourceLineNo">069</span> if (haltOnTimeout) {<a name="line.69"></a> |
| <span class="sourceLineNo">070</span> LOG.error("Zombie Master exiting. Thread dump to stdout");<a name="line.70"></a> |
| <span class="sourceLineNo">071</span> Threads.printThreadInfo(System.out, "Zombie HMaster");<a name="line.71"></a> |
| <span class="sourceLineNo">072</span> System.exit(-1);<a name="line.72"></a> |
| <span class="sourceLineNo">073</span> }<a name="line.73"></a> |
| <span class="sourceLineNo">074</span> }<a name="line.74"></a> |
| <span class="sourceLineNo">075</span> }<a name="line.75"></a> |
| <span class="sourceLineNo">076</span> } catch (InterruptedException ie) {<a name="line.76"></a> |
| <span class="sourceLineNo">077</span> LOG.trace("InitMonitor thread interrupted. Existing.");<a name="line.77"></a> |
| <span class="sourceLineNo">078</span> }<a name="line.78"></a> |
| <span class="sourceLineNo">079</span> }<a name="line.79"></a> |
| <span class="sourceLineNo">080</span>}<a name="line.80"></a> |
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