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| <pre><span class="sourceLineNo">001</span>/**<a name="line.1"></a> |
| <span class="sourceLineNo">002</span> *<a name="line.2"></a> |
| <span class="sourceLineNo">003</span> * Licensed to the Apache Software Foundation (ASF) under one<a name="line.3"></a> |
| <span class="sourceLineNo">004</span> * or more contributor license agreements. See the NOTICE file<a name="line.4"></a> |
| <span class="sourceLineNo">005</span> * distributed with this work for additional information<a name="line.5"></a> |
| <span class="sourceLineNo">006</span> * regarding copyright ownership. The ASF licenses this file<a name="line.6"></a> |
| <span class="sourceLineNo">007</span> * to you under the Apache License, Version 2.0 (the<a name="line.7"></a> |
| <span class="sourceLineNo">008</span> * "License"); you may not use this file except in compliance<a name="line.8"></a> |
| <span class="sourceLineNo">009</span> * with the License. You may obtain a copy of the License at<a name="line.9"></a> |
| <span class="sourceLineNo">010</span> *<a name="line.10"></a> |
| <span class="sourceLineNo">011</span> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.11"></a> |
| <span class="sourceLineNo">012</span> *<a name="line.12"></a> |
| <span class="sourceLineNo">013</span> * Unless required by applicable law or agreed to in writing, software<a name="line.13"></a> |
| <span class="sourceLineNo">014</span> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.14"></a> |
| <span class="sourceLineNo">015</span> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.15"></a> |
| <span class="sourceLineNo">016</span> * See the License for the specific language governing permissions and<a name="line.16"></a> |
| <span class="sourceLineNo">017</span> * limitations under the License.<a name="line.17"></a> |
| <span class="sourceLineNo">018</span> */<a name="line.18"></a> |
| <span class="sourceLineNo">019</span>package org.apache.hadoop.hbase.regionserver;<a name="line.19"></a> |
| <span class="sourceLineNo">020</span><a name="line.20"></a> |
| <span class="sourceLineNo">021</span>import java.io.IOException;<a name="line.21"></a> |
| <span class="sourceLineNo">022</span>import java.lang.reflect.Field;<a name="line.22"></a> |
| <span class="sourceLineNo">023</span>import java.util.HashMap;<a name="line.23"></a> |
| <span class="sourceLineNo">024</span>import java.util.Map;<a name="line.24"></a> |
| <span class="sourceLineNo">025</span><a name="line.25"></a> |
| <span class="sourceLineNo">026</span>import org.apache.yetus.audience.InterfaceAudience;<a name="line.26"></a> |
| <span class="sourceLineNo">027</span>import org.slf4j.Logger;<a name="line.27"></a> |
| <span class="sourceLineNo">028</span>import org.slf4j.LoggerFactory;<a name="line.28"></a> |
| <span class="sourceLineNo">029</span>import org.apache.hadoop.conf.Configuration;<a name="line.29"></a> |
| <span class="sourceLineNo">030</span>import org.apache.hadoop.fs.FileSystem;<a name="line.30"></a> |
| <span class="sourceLineNo">031</span>import org.apache.hadoop.hbase.HBaseConfiguration;<a name="line.31"></a> |
| <span class="sourceLineNo">032</span>import org.apache.hadoop.hbase.Stoppable;<a name="line.32"></a> |
| <span class="sourceLineNo">033</span>import org.apache.hadoop.hbase.log.HBaseMarkers;<a name="line.33"></a> |
| <span class="sourceLineNo">034</span>import org.apache.hadoop.hbase.util.ShutdownHookManager;<a name="line.34"></a> |
| <span class="sourceLineNo">035</span>import org.apache.hadoop.hbase.util.Threads;<a name="line.35"></a> |
| <span class="sourceLineNo">036</span><a name="line.36"></a> |
| <span class="sourceLineNo">037</span>/**<a name="line.37"></a> |
| <span class="sourceLineNo">038</span> * Manage regionserver shutdown hooks.<a name="line.38"></a> |
| <span class="sourceLineNo">039</span> * @see #install(Configuration, FileSystem, Stoppable, Thread)<a name="line.39"></a> |
| <span class="sourceLineNo">040</span> */<a name="line.40"></a> |
| <span class="sourceLineNo">041</span>@InterfaceAudience.Private<a name="line.41"></a> |
| <span class="sourceLineNo">042</span>public class ShutdownHook {<a name="line.42"></a> |
| <span class="sourceLineNo">043</span> private static final Logger LOG = LoggerFactory.getLogger(ShutdownHook.class);<a name="line.43"></a> |
| <span class="sourceLineNo">044</span> private static final String CLIENT_FINALIZER_DATA_METHOD = "clientFinalizer";<a name="line.44"></a> |
| <span class="sourceLineNo">045</span><a name="line.45"></a> |
| <span class="sourceLineNo">046</span> /**<a name="line.46"></a> |
| <span class="sourceLineNo">047</span> * Key for boolean configuration whose default is true.<a name="line.47"></a> |
| <span class="sourceLineNo">048</span> */<a name="line.48"></a> |
| <span class="sourceLineNo">049</span> public static final String RUN_SHUTDOWN_HOOK = "hbase.shutdown.hook";<a name="line.49"></a> |
| <span class="sourceLineNo">050</span><a name="line.50"></a> |
| <span class="sourceLineNo">051</span> /**<a name="line.51"></a> |
| <span class="sourceLineNo">052</span> * Key for a long configuration on how much time to wait on the fs shutdown<a name="line.52"></a> |
| <span class="sourceLineNo">053</span> * hook. Default is 30 seconds.<a name="line.53"></a> |
| <span class="sourceLineNo">054</span> */<a name="line.54"></a> |
| <span class="sourceLineNo">055</span> public static final String FS_SHUTDOWN_HOOK_WAIT = "hbase.fs.shutdown.hook.wait";<a name="line.55"></a> |
| <span class="sourceLineNo">056</span><a name="line.56"></a> |
| <span class="sourceLineNo">057</span> /**<a name="line.57"></a> |
| <span class="sourceLineNo">058</span> * A place for keeping track of all the filesystem shutdown hooks that need<a name="line.58"></a> |
| <span class="sourceLineNo">059</span> * to be executed after the last regionserver referring to a given filesystem<a name="line.59"></a> |
| <span class="sourceLineNo">060</span> * stops. We keep track of the # of regionserver references in values of the map.<a name="line.60"></a> |
| <span class="sourceLineNo">061</span> */<a name="line.61"></a> |
| <span class="sourceLineNo">062</span> private final static Map<Runnable, Integer> fsShutdownHooks = new HashMap<>();<a name="line.62"></a> |
| <span class="sourceLineNo">063</span><a name="line.63"></a> |
| <span class="sourceLineNo">064</span> /**<a name="line.64"></a> |
| <span class="sourceLineNo">065</span> * Install a shutdown hook that calls stop on the passed Stoppable<a name="line.65"></a> |
| <span class="sourceLineNo">066</span> * and then thread joins against the passed <code>threadToJoin</code>.<a name="line.66"></a> |
| <span class="sourceLineNo">067</span> * When this thread completes, it then runs the hdfs thread (This install<a name="line.67"></a> |
| <span class="sourceLineNo">068</span> * removes the hdfs shutdown hook keeping a handle on it to run it after<a name="line.68"></a> |
| <span class="sourceLineNo">069</span> * <code>threadToJoin</code> has stopped).<a name="line.69"></a> |
| <span class="sourceLineNo">070</span> *<a name="line.70"></a> |
| <span class="sourceLineNo">071</span> * <p>To suppress all shutdown hook handling -- both the running of the<a name="line.71"></a> |
| <span class="sourceLineNo">072</span> * regionserver hook and of the hdfs hook code -- set<a name="line.72"></a> |
| <span class="sourceLineNo">073</span> * {@link ShutdownHook#RUN_SHUTDOWN_HOOK} in {@link Configuration} to<a name="line.73"></a> |
| <span class="sourceLineNo">074</span> * <code>false</code>.<a name="line.74"></a> |
| <span class="sourceLineNo">075</span> * This configuration value is checked when the hook code runs.<a name="line.75"></a> |
| <span class="sourceLineNo">076</span> * @param conf<a name="line.76"></a> |
| <span class="sourceLineNo">077</span> * @param fs Instance of Filesystem used by the RegionServer<a name="line.77"></a> |
| <span class="sourceLineNo">078</span> * @param stop Installed shutdown hook will call stop against this passed<a name="line.78"></a> |
| <span class="sourceLineNo">079</span> * <code>Stoppable</code> instance.<a name="line.79"></a> |
| <span class="sourceLineNo">080</span> * @param threadToJoin After calling stop on <code>stop</code> will then<a name="line.80"></a> |
| <span class="sourceLineNo">081</span> * join this thread.<a name="line.81"></a> |
| <span class="sourceLineNo">082</span> */<a name="line.82"></a> |
| <span class="sourceLineNo">083</span> public static void install(final Configuration conf, final FileSystem fs,<a name="line.83"></a> |
| <span class="sourceLineNo">084</span> final Stoppable stop, final Thread threadToJoin) {<a name="line.84"></a> |
| <span class="sourceLineNo">085</span> Runnable fsShutdownHook = suppressHdfsShutdownHook(fs);<a name="line.85"></a> |
| <span class="sourceLineNo">086</span> Thread t = new ShutdownHookThread(conf, stop, threadToJoin, fsShutdownHook);<a name="line.86"></a> |
| <span class="sourceLineNo">087</span> ShutdownHookManager.affixShutdownHook(t, 0);<a name="line.87"></a> |
| <span class="sourceLineNo">088</span> LOG.debug("Installed shutdown hook thread: " + t.getName());<a name="line.88"></a> |
| <span class="sourceLineNo">089</span> }<a name="line.89"></a> |
| <span class="sourceLineNo">090</span><a name="line.90"></a> |
| <span class="sourceLineNo">091</span> /*<a name="line.91"></a> |
| <span class="sourceLineNo">092</span> * Thread run by shutdown hook.<a name="line.92"></a> |
| <span class="sourceLineNo">093</span> */<a name="line.93"></a> |
| <span class="sourceLineNo">094</span> private static class ShutdownHookThread extends Thread {<a name="line.94"></a> |
| <span class="sourceLineNo">095</span> private final Stoppable stop;<a name="line.95"></a> |
| <span class="sourceLineNo">096</span> private final Thread threadToJoin;<a name="line.96"></a> |
| <span class="sourceLineNo">097</span> private final Runnable fsShutdownHook;<a name="line.97"></a> |
| <span class="sourceLineNo">098</span> private final Configuration conf;<a name="line.98"></a> |
| <span class="sourceLineNo">099</span><a name="line.99"></a> |
| <span class="sourceLineNo">100</span> ShutdownHookThread(final Configuration conf, final Stoppable stop,<a name="line.100"></a> |
| <span class="sourceLineNo">101</span> final Thread threadToJoin, final Runnable fsShutdownHook) {<a name="line.101"></a> |
| <span class="sourceLineNo">102</span> super("Shutdownhook:" + threadToJoin.getName());<a name="line.102"></a> |
| <span class="sourceLineNo">103</span> this.stop = stop;<a name="line.103"></a> |
| <span class="sourceLineNo">104</span> this.threadToJoin = threadToJoin;<a name="line.104"></a> |
| <span class="sourceLineNo">105</span> this.conf = conf;<a name="line.105"></a> |
| <span class="sourceLineNo">106</span> this.fsShutdownHook = fsShutdownHook;<a name="line.106"></a> |
| <span class="sourceLineNo">107</span> }<a name="line.107"></a> |
| <span class="sourceLineNo">108</span><a name="line.108"></a> |
| <span class="sourceLineNo">109</span> @Override<a name="line.109"></a> |
| <span class="sourceLineNo">110</span> public void run() {<a name="line.110"></a> |
| <span class="sourceLineNo">111</span> boolean b = this.conf.getBoolean(RUN_SHUTDOWN_HOOK, true);<a name="line.111"></a> |
| <span class="sourceLineNo">112</span> LOG.info("Shutdown hook starting; " + RUN_SHUTDOWN_HOOK + "=" + b +<a name="line.112"></a> |
| <span class="sourceLineNo">113</span> "; fsShutdownHook=" + this.fsShutdownHook);<a name="line.113"></a> |
| <span class="sourceLineNo">114</span> if (b) {<a name="line.114"></a> |
| <span class="sourceLineNo">115</span> this.stop.stop("Shutdown hook");<a name="line.115"></a> |
| <span class="sourceLineNo">116</span> Threads.shutdown(this.threadToJoin);<a name="line.116"></a> |
| <span class="sourceLineNo">117</span> if (this.fsShutdownHook != null) {<a name="line.117"></a> |
| <span class="sourceLineNo">118</span> synchronized (fsShutdownHooks) {<a name="line.118"></a> |
| <span class="sourceLineNo">119</span> int refs = fsShutdownHooks.get(fsShutdownHook);<a name="line.119"></a> |
| <span class="sourceLineNo">120</span> if (refs == 1) {<a name="line.120"></a> |
| <span class="sourceLineNo">121</span> LOG.info("Starting fs shutdown hook thread.");<a name="line.121"></a> |
| <span class="sourceLineNo">122</span> Thread fsShutdownHookThread = (fsShutdownHook instanceof Thread) ?<a name="line.122"></a> |
| <span class="sourceLineNo">123</span> (Thread)fsShutdownHook : new Thread(fsShutdownHook,<a name="line.123"></a> |
| <span class="sourceLineNo">124</span> fsShutdownHook.getClass().getSimpleName() + "-shutdown-hook");<a name="line.124"></a> |
| <span class="sourceLineNo">125</span> fsShutdownHookThread.start();<a name="line.125"></a> |
| <span class="sourceLineNo">126</span> Threads.shutdown(fsShutdownHookThread,<a name="line.126"></a> |
| <span class="sourceLineNo">127</span> this.conf.getLong(FS_SHUTDOWN_HOOK_WAIT, 30000));<a name="line.127"></a> |
| <span class="sourceLineNo">128</span> }<a name="line.128"></a> |
| <span class="sourceLineNo">129</span> if (refs > 0) {<a name="line.129"></a> |
| <span class="sourceLineNo">130</span> fsShutdownHooks.put(fsShutdownHook, refs - 1);<a name="line.130"></a> |
| <span class="sourceLineNo">131</span> }<a name="line.131"></a> |
| <span class="sourceLineNo">132</span> }<a name="line.132"></a> |
| <span class="sourceLineNo">133</span> }<a name="line.133"></a> |
| <span class="sourceLineNo">134</span> }<a name="line.134"></a> |
| <span class="sourceLineNo">135</span> LOG.info("Shutdown hook finished.");<a name="line.135"></a> |
| <span class="sourceLineNo">136</span> }<a name="line.136"></a> |
| <span class="sourceLineNo">137</span> }<a name="line.137"></a> |
| <span class="sourceLineNo">138</span><a name="line.138"></a> |
| <span class="sourceLineNo">139</span> /*<a name="line.139"></a> |
| <span class="sourceLineNo">140</span> * So, HDFS keeps a static map of all FS instances. In order to make sure<a name="line.140"></a> |
| <span class="sourceLineNo">141</span> * things are cleaned up on our way out, it also creates a shutdown hook<a name="line.141"></a> |
| <span class="sourceLineNo">142</span> * so that all filesystems can be closed when the process is terminated; it<a name="line.142"></a> |
| <span class="sourceLineNo">143</span> * calls FileSystem.closeAll. This inconveniently runs concurrently with our<a name="line.143"></a> |
| <span class="sourceLineNo">144</span> * own shutdown handler, and therefore causes all the filesystems to be closed<a name="line.144"></a> |
| <span class="sourceLineNo">145</span> * before the server can do all its necessary cleanup.<a name="line.145"></a> |
| <span class="sourceLineNo">146</span> *<a name="line.146"></a> |
| <span class="sourceLineNo">147</span> * <p>The dirty reflection in this method sneaks into the FileSystem class<a name="line.147"></a> |
| <span class="sourceLineNo">148</span> * and grabs the shutdown hook, removes it from the list of active shutdown<a name="line.148"></a> |
| <span class="sourceLineNo">149</span> * hooks, and returns the hook for the caller to run at its convenience.<a name="line.149"></a> |
| <span class="sourceLineNo">150</span> *<a name="line.150"></a> |
| <span class="sourceLineNo">151</span> * <p>This seems quite fragile and susceptible to breaking if Hadoop changes<a name="line.151"></a> |
| <span class="sourceLineNo">152</span> * anything about the way this cleanup is managed. Keep an eye on things.<a name="line.152"></a> |
| <span class="sourceLineNo">153</span> * @return The fs shutdown hook<a name="line.153"></a> |
| <span class="sourceLineNo">154</span> * @throws RuntimeException if we fail to find or grap the shutdown hook.<a name="line.154"></a> |
| <span class="sourceLineNo">155</span> */<a name="line.155"></a> |
| <span class="sourceLineNo">156</span> private static Runnable suppressHdfsShutdownHook(final FileSystem fs) {<a name="line.156"></a> |
| <span class="sourceLineNo">157</span> try {<a name="line.157"></a> |
| <span class="sourceLineNo">158</span> // This introspection has been updated to work for hadoop 0.20, 0.21 and for<a name="line.158"></a> |
| <span class="sourceLineNo">159</span> // cloudera 0.20. 0.21 and cloudera 0.20 both have hadoop-4829. With the<a name="line.159"></a> |
| <span class="sourceLineNo">160</span> // latter in place, things are a little messy in that there are now two<a name="line.160"></a> |
| <span class="sourceLineNo">161</span> // instances of the data member clientFinalizer; an uninstalled one in<a name="line.161"></a> |
| <span class="sourceLineNo">162</span> // FileSystem and one in the innner class named Cache that actually gets<a name="line.162"></a> |
| <span class="sourceLineNo">163</span> // registered as a shutdown hook. If the latter is present, then we are<a name="line.163"></a> |
| <span class="sourceLineNo">164</span> // on 0.21 or cloudera patched 0.20.<a name="line.164"></a> |
| <span class="sourceLineNo">165</span> Runnable hdfsClientFinalizer = null;<a name="line.165"></a> |
| <span class="sourceLineNo">166</span> // Look into the FileSystem#Cache class for clientFinalizer<a name="line.166"></a> |
| <span class="sourceLineNo">167</span> Class<?> [] classes = FileSystem.class.getDeclaredClasses();<a name="line.167"></a> |
| <span class="sourceLineNo">168</span> Class<?> cache = null;<a name="line.168"></a> |
| <span class="sourceLineNo">169</span> for (Class<?> c: classes) {<a name="line.169"></a> |
| <span class="sourceLineNo">170</span> if (c.getSimpleName().equals("Cache")) {<a name="line.170"></a> |
| <span class="sourceLineNo">171</span> cache = c;<a name="line.171"></a> |
| <span class="sourceLineNo">172</span> break;<a name="line.172"></a> |
| <span class="sourceLineNo">173</span> }<a name="line.173"></a> |
| <span class="sourceLineNo">174</span> }<a name="line.174"></a> |
| <span class="sourceLineNo">175</span><a name="line.175"></a> |
| <span class="sourceLineNo">176</span> if (cache == null) {<a name="line.176"></a> |
| <span class="sourceLineNo">177</span> throw new RuntimeException(<a name="line.177"></a> |
| <span class="sourceLineNo">178</span> "This should not happen. Could not find the cache class in FileSystem.");<a name="line.178"></a> |
| <span class="sourceLineNo">179</span> }<a name="line.179"></a> |
| <span class="sourceLineNo">180</span><a name="line.180"></a> |
| <span class="sourceLineNo">181</span> Field field = null;<a name="line.181"></a> |
| <span class="sourceLineNo">182</span> try {<a name="line.182"></a> |
| <span class="sourceLineNo">183</span> field = cache.getDeclaredField(CLIENT_FINALIZER_DATA_METHOD);<a name="line.183"></a> |
| <span class="sourceLineNo">184</span> } catch (NoSuchFieldException e) {<a name="line.184"></a> |
| <span class="sourceLineNo">185</span> // We can get here if the Cache class does not have a clientFinalizer<a name="line.185"></a> |
| <span class="sourceLineNo">186</span> // instance: i.e. we're running on straight 0.20 w/o hadoop-4829.<a name="line.186"></a> |
| <span class="sourceLineNo">187</span> }<a name="line.187"></a> |
| <span class="sourceLineNo">188</span> if (field != null) {<a name="line.188"></a> |
| <span class="sourceLineNo">189</span> field.setAccessible(true);<a name="line.189"></a> |
| <span class="sourceLineNo">190</span> Field cacheField = FileSystem.class.getDeclaredField("CACHE");<a name="line.190"></a> |
| <span class="sourceLineNo">191</span> cacheField.setAccessible(true);<a name="line.191"></a> |
| <span class="sourceLineNo">192</span> Object cacheInstance = cacheField.get(fs);<a name="line.192"></a> |
| <span class="sourceLineNo">193</span> hdfsClientFinalizer = (Runnable)field.get(cacheInstance);<a name="line.193"></a> |
| <span class="sourceLineNo">194</span> } else {<a name="line.194"></a> |
| <span class="sourceLineNo">195</span> // Then we didnt' find clientFinalizer in Cache. Presume clean 0.20 hadoop.<a name="line.195"></a> |
| <span class="sourceLineNo">196</span> field = FileSystem.class.getDeclaredField(CLIENT_FINALIZER_DATA_METHOD);<a name="line.196"></a> |
| <span class="sourceLineNo">197</span> field.setAccessible(true);<a name="line.197"></a> |
| <span class="sourceLineNo">198</span> hdfsClientFinalizer = (Runnable)field.get(null);<a name="line.198"></a> |
| <span class="sourceLineNo">199</span> }<a name="line.199"></a> |
| <span class="sourceLineNo">200</span> if (hdfsClientFinalizer == null) {<a name="line.200"></a> |
| <span class="sourceLineNo">201</span> throw new RuntimeException("Client finalizer is null, can't suppress!");<a name="line.201"></a> |
| <span class="sourceLineNo">202</span> }<a name="line.202"></a> |
| <span class="sourceLineNo">203</span> synchronized (fsShutdownHooks) {<a name="line.203"></a> |
| <span class="sourceLineNo">204</span> boolean isFSCacheDisabled = fs.getConf().getBoolean("fs.hdfs.impl.disable.cache", false);<a name="line.204"></a> |
| <span class="sourceLineNo">205</span> if (!isFSCacheDisabled && !fsShutdownHooks.containsKey(hdfsClientFinalizer)<a name="line.205"></a> |
| <span class="sourceLineNo">206</span> && !ShutdownHookManager.deleteShutdownHook(hdfsClientFinalizer)) {<a name="line.206"></a> |
| <span class="sourceLineNo">207</span> throw new RuntimeException(<a name="line.207"></a> |
| <span class="sourceLineNo">208</span> "Failed suppression of fs shutdown hook: " + hdfsClientFinalizer);<a name="line.208"></a> |
| <span class="sourceLineNo">209</span> }<a name="line.209"></a> |
| <span class="sourceLineNo">210</span> Integer refs = fsShutdownHooks.get(hdfsClientFinalizer);<a name="line.210"></a> |
| <span class="sourceLineNo">211</span> fsShutdownHooks.put(hdfsClientFinalizer, refs == null ? 1 : refs + 1);<a name="line.211"></a> |
| <span class="sourceLineNo">212</span> }<a name="line.212"></a> |
| <span class="sourceLineNo">213</span> return hdfsClientFinalizer;<a name="line.213"></a> |
| <span class="sourceLineNo">214</span> } catch (NoSuchFieldException nsfe) {<a name="line.214"></a> |
| <span class="sourceLineNo">215</span> LOG.error(HBaseMarkers.FATAL, "Couldn't find field 'clientFinalizer' in FileSystem!",<a name="line.215"></a> |
| <span class="sourceLineNo">216</span> nsfe);<a name="line.216"></a> |
| <span class="sourceLineNo">217</span> throw new RuntimeException("Failed to suppress HDFS shutdown hook");<a name="line.217"></a> |
| <span class="sourceLineNo">218</span> } catch (IllegalAccessException iae) {<a name="line.218"></a> |
| <span class="sourceLineNo">219</span> LOG.error(HBaseMarkers.FATAL, "Couldn't access field 'clientFinalizer' in FileSystem!",<a name="line.219"></a> |
| <span class="sourceLineNo">220</span> iae);<a name="line.220"></a> |
| <span class="sourceLineNo">221</span> throw new RuntimeException("Failed to suppress HDFS shutdown hook");<a name="line.221"></a> |
| <span class="sourceLineNo">222</span> }<a name="line.222"></a> |
| <span class="sourceLineNo">223</span> }<a name="line.223"></a> |
| <span class="sourceLineNo">224</span><a name="line.224"></a> |
| <span class="sourceLineNo">225</span> // Thread that does nothing. Used in below main testing.<a name="line.225"></a> |
| <span class="sourceLineNo">226</span> static class DoNothingThread extends Thread {<a name="line.226"></a> |
| <span class="sourceLineNo">227</span> DoNothingThread() {<a name="line.227"></a> |
| <span class="sourceLineNo">228</span> super("donothing");<a name="line.228"></a> |
| <span class="sourceLineNo">229</span> }<a name="line.229"></a> |
| <span class="sourceLineNo">230</span> @Override<a name="line.230"></a> |
| <span class="sourceLineNo">231</span> public void run() {<a name="line.231"></a> |
| <span class="sourceLineNo">232</span> super.run();<a name="line.232"></a> |
| <span class="sourceLineNo">233</span> }<a name="line.233"></a> |
| <span class="sourceLineNo">234</span> }<a name="line.234"></a> |
| <span class="sourceLineNo">235</span><a name="line.235"></a> |
| <span class="sourceLineNo">236</span> // Stoppable with nothing to stop. Used below in main testing.<a name="line.236"></a> |
| <span class="sourceLineNo">237</span> static class DoNothingStoppable implements Stoppable {<a name="line.237"></a> |
| <span class="sourceLineNo">238</span> @Override<a name="line.238"></a> |
| <span class="sourceLineNo">239</span> public boolean isStopped() {<a name="line.239"></a> |
| <span class="sourceLineNo">240</span> // TODO Auto-generated method stub<a name="line.240"></a> |
| <span class="sourceLineNo">241</span> return false;<a name="line.241"></a> |
| <span class="sourceLineNo">242</span> }<a name="line.242"></a> |
| <span class="sourceLineNo">243</span><a name="line.243"></a> |
| <span class="sourceLineNo">244</span> @Override<a name="line.244"></a> |
| <span class="sourceLineNo">245</span> public void stop(String why) {<a name="line.245"></a> |
| <span class="sourceLineNo">246</span> // TODO Auto-generated method stub<a name="line.246"></a> |
| <span class="sourceLineNo">247</span> }<a name="line.247"></a> |
| <span class="sourceLineNo">248</span> }<a name="line.248"></a> |
| <span class="sourceLineNo">249</span><a name="line.249"></a> |
| <span class="sourceLineNo">250</span> /**<a name="line.250"></a> |
| <span class="sourceLineNo">251</span> * Main to test basic functionality. Run with clean hadoop 0.20 and hadoop<a name="line.251"></a> |
| <span class="sourceLineNo">252</span> * 0.21 and cloudera patched hadoop to make sure our shutdown hook handling<a name="line.252"></a> |
| <span class="sourceLineNo">253</span> * works for all compbinations.<a name="line.253"></a> |
| <span class="sourceLineNo">254</span> * Pass '-Dhbase.shutdown.hook=false' to test turning off the running of<a name="line.254"></a> |
| <span class="sourceLineNo">255</span> * shutdown hooks.<a name="line.255"></a> |
| <span class="sourceLineNo">256</span> * @param args<a name="line.256"></a> |
| <span class="sourceLineNo">257</span> * @throws IOException<a name="line.257"></a> |
| <span class="sourceLineNo">258</span> */<a name="line.258"></a> |
| <span class="sourceLineNo">259</span> public static void main(final String [] args) throws IOException {<a name="line.259"></a> |
| <span class="sourceLineNo">260</span> Configuration conf = HBaseConfiguration.create();<a name="line.260"></a> |
| <span class="sourceLineNo">261</span> String prop = System.getProperty(RUN_SHUTDOWN_HOOK);<a name="line.261"></a> |
| <span class="sourceLineNo">262</span> if (prop != null) {<a name="line.262"></a> |
| <span class="sourceLineNo">263</span> conf.setBoolean(RUN_SHUTDOWN_HOOK, Boolean.parseBoolean(prop));<a name="line.263"></a> |
| <span class="sourceLineNo">264</span> }<a name="line.264"></a> |
| <span class="sourceLineNo">265</span> // Instantiate a FileSystem. This will register the fs shutdown hook.<a name="line.265"></a> |
| <span class="sourceLineNo">266</span> FileSystem fs = FileSystem.get(conf);<a name="line.266"></a> |
| <span class="sourceLineNo">267</span> Thread donothing = new DoNothingThread();<a name="line.267"></a> |
| <span class="sourceLineNo">268</span> donothing.start();<a name="line.268"></a> |
| <span class="sourceLineNo">269</span> ShutdownHook.install(conf, fs, new DoNothingStoppable(), donothing);<a name="line.269"></a> |
| <span class="sourceLineNo">270</span> }<a name="line.270"></a> |
| <span class="sourceLineNo">271</span>}<a name="line.271"></a> |
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| </pre> |
| </div> |
| </body> |
| </html> |
