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<FONT color="green">001</FONT>    /**<a name="line.1"></a>
<FONT color="green">002</FONT>     * Licensed to the Apache Software Foundation (ASF) under one<a name="line.2"></a>
<FONT color="green">003</FONT>     * or more contributor license agreements.  See the NOTICE file<a name="line.3"></a>
<FONT color="green">004</FONT>     * distributed with this work for additional information<a name="line.4"></a>
<FONT color="green">005</FONT>     * regarding copyright ownership.  The ASF licenses this file<a name="line.5"></a>
<FONT color="green">006</FONT>     * to you under the Apache License, Version 2.0 (the<a name="line.6"></a>
<FONT color="green">007</FONT>     * "License"); you may not use this file except in compliance<a name="line.7"></a>
<FONT color="green">008</FONT>     * with the License.  You may obtain a copy of the License at<a name="line.8"></a>
<FONT color="green">009</FONT>     *<a name="line.9"></a>
<FONT color="green">010</FONT>     *     http://www.apache.org/licenses/LICENSE-2.0<a name="line.10"></a>
<FONT color="green">011</FONT>     *<a name="line.11"></a>
<FONT color="green">012</FONT>     * Unless required by applicable law or agreed to in writing, software<a name="line.12"></a>
<FONT color="green">013</FONT>     * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.13"></a>
<FONT color="green">014</FONT>     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.14"></a>
<FONT color="green">015</FONT>     * See the License for the specific language governing permissions and<a name="line.15"></a>
<FONT color="green">016</FONT>     * limitations under the License.<a name="line.16"></a>
<FONT color="green">017</FONT>     */<a name="line.17"></a>
<FONT color="green">018</FONT>    <a name="line.18"></a>
<FONT color="green">019</FONT>    package org.apache.hadoop.mapreduce.lib.map;<a name="line.19"></a>
<FONT color="green">020</FONT>    <a name="line.20"></a>
<FONT color="green">021</FONT>    import org.apache.hadoop.util.ReflectionUtils;<a name="line.21"></a>
<FONT color="green">022</FONT>    import org.apache.hadoop.classification.InterfaceAudience;<a name="line.22"></a>
<FONT color="green">023</FONT>    import org.apache.hadoop.classification.InterfaceStability;<a name="line.23"></a>
<FONT color="green">024</FONT>    import org.apache.hadoop.conf.Configuration;<a name="line.24"></a>
<FONT color="green">025</FONT>    import org.apache.hadoop.mapreduce.Counter;<a name="line.25"></a>
<FONT color="green">026</FONT>    import org.apache.hadoop.mapreduce.InputSplit;<a name="line.26"></a>
<FONT color="green">027</FONT>    import org.apache.hadoop.mapreduce.Job;<a name="line.27"></a>
<FONT color="green">028</FONT>    import org.apache.hadoop.mapreduce.JobContext;<a name="line.28"></a>
<FONT color="green">029</FONT>    import org.apache.hadoop.mapreduce.MapContext;<a name="line.29"></a>
<FONT color="green">030</FONT>    import org.apache.hadoop.mapreduce.Mapper;<a name="line.30"></a>
<FONT color="green">031</FONT>    import org.apache.hadoop.mapreduce.RecordReader;<a name="line.31"></a>
<FONT color="green">032</FONT>    import org.apache.hadoop.mapreduce.RecordWriter;<a name="line.32"></a>
<FONT color="green">033</FONT>    import org.apache.hadoop.mapreduce.StatusReporter;<a name="line.33"></a>
<FONT color="green">034</FONT>    import org.apache.hadoop.mapreduce.TaskAttemptContext;<a name="line.34"></a>
<FONT color="green">035</FONT>    import org.apache.hadoop.mapreduce.task.MapContextImpl;<a name="line.35"></a>
<FONT color="green">036</FONT>    import org.apache.commons.logging.Log;<a name="line.36"></a>
<FONT color="green">037</FONT>    import org.apache.commons.logging.LogFactory;<a name="line.37"></a>
<FONT color="green">038</FONT>    <a name="line.38"></a>
<FONT color="green">039</FONT>    import java.io.IOException;<a name="line.39"></a>
<FONT color="green">040</FONT>    import java.util.ArrayList;<a name="line.40"></a>
<FONT color="green">041</FONT>    import java.util.List;<a name="line.41"></a>
<FONT color="green">042</FONT>    <a name="line.42"></a>
<FONT color="green">043</FONT>    /**<a name="line.43"></a>
<FONT color="green">044</FONT>     * Multithreaded implementation for @link org.apache.hadoop.mapreduce.Mapper.<a name="line.44"></a>
<FONT color="green">045</FONT>     * &lt;p&gt;<a name="line.45"></a>
<FONT color="green">046</FONT>     * It can be used instead of the default implementation,<a name="line.46"></a>
<FONT color="green">047</FONT>     * @link org.apache.hadoop.mapred.MapRunner, when the Map operation is not CPU<a name="line.47"></a>
<FONT color="green">048</FONT>     * bound in order to improve throughput.<a name="line.48"></a>
<FONT color="green">049</FONT>     * &lt;p&gt;<a name="line.49"></a>
<FONT color="green">050</FONT>     * Mapper implementations using this MapRunnable must be thread-safe.<a name="line.50"></a>
<FONT color="green">051</FONT>     * &lt;p&gt;<a name="line.51"></a>
<FONT color="green">052</FONT>     * The Map-Reduce job has to be configured with the mapper to use via <a name="line.52"></a>
<FONT color="green">053</FONT>     * {@link #setMapperClass(Configuration, Class)} and<a name="line.53"></a>
<FONT color="green">054</FONT>     * the number of thread the thread-pool can use with the<a name="line.54"></a>
<FONT color="green">055</FONT>     * {@link #getNumberOfThreads(Configuration) method. The default<a name="line.55"></a>
<FONT color="green">056</FONT>     * value is 10 threads.<a name="line.56"></a>
<FONT color="green">057</FONT>     * &lt;p&gt;<a name="line.57"></a>
<FONT color="green">058</FONT>     */<a name="line.58"></a>
<FONT color="green">059</FONT>    @InterfaceAudience.Public<a name="line.59"></a>
<FONT color="green">060</FONT>    @InterfaceStability.Stable<a name="line.60"></a>
<FONT color="green">061</FONT>    public class MultithreadedMapper&lt;K1, V1, K2, V2&gt; <a name="line.61"></a>
<FONT color="green">062</FONT>      extends Mapper&lt;K1, V1, K2, V2&gt; {<a name="line.62"></a>
<FONT color="green">063</FONT>    <a name="line.63"></a>
<FONT color="green">064</FONT>      private static final Log LOG = LogFactory.getLog(MultithreadedMapper.class);<a name="line.64"></a>
<FONT color="green">065</FONT>      public static String NUM_THREADS = "mapreduce.mapper.multithreadedmapper.threads";<a name="line.65"></a>
<FONT color="green">066</FONT>      public static String MAP_CLASS = "mapreduce.mapper.multithreadedmapper.mapclass";<a name="line.66"></a>
<FONT color="green">067</FONT>      <a name="line.67"></a>
<FONT color="green">068</FONT>      private Class&lt;? extends Mapper&lt;K1,V1,K2,V2&gt;&gt; mapClass;<a name="line.68"></a>
<FONT color="green">069</FONT>      private Context outer;<a name="line.69"></a>
<FONT color="green">070</FONT>      private List&lt;MapRunner&gt; runners;<a name="line.70"></a>
<FONT color="green">071</FONT>    <a name="line.71"></a>
<FONT color="green">072</FONT>      /**<a name="line.72"></a>
<FONT color="green">073</FONT>       * The number of threads in the thread pool that will run the map function.<a name="line.73"></a>
<FONT color="green">074</FONT>       * @param job the job<a name="line.74"></a>
<FONT color="green">075</FONT>       * @return the number of threads<a name="line.75"></a>
<FONT color="green">076</FONT>       */<a name="line.76"></a>
<FONT color="green">077</FONT>      public static int getNumberOfThreads(JobContext job) {<a name="line.77"></a>
<FONT color="green">078</FONT>        return job.getConfiguration().getInt(NUM_THREADS, 10);<a name="line.78"></a>
<FONT color="green">079</FONT>      }<a name="line.79"></a>
<FONT color="green">080</FONT>    <a name="line.80"></a>
<FONT color="green">081</FONT>      /**<a name="line.81"></a>
<FONT color="green">082</FONT>       * Set the number of threads in the pool for running maps.<a name="line.82"></a>
<FONT color="green">083</FONT>       * @param job the job to modify<a name="line.83"></a>
<FONT color="green">084</FONT>       * @param threads the new number of threads<a name="line.84"></a>
<FONT color="green">085</FONT>       */<a name="line.85"></a>
<FONT color="green">086</FONT>      public static void setNumberOfThreads(Job job, int threads) {<a name="line.86"></a>
<FONT color="green">087</FONT>        job.getConfiguration().setInt(NUM_THREADS, threads);<a name="line.87"></a>
<FONT color="green">088</FONT>      }<a name="line.88"></a>
<FONT color="green">089</FONT>    <a name="line.89"></a>
<FONT color="green">090</FONT>      /**<a name="line.90"></a>
<FONT color="green">091</FONT>       * Get the application's mapper class.<a name="line.91"></a>
<FONT color="green">092</FONT>       * @param &lt;K1&gt; the map's input key type<a name="line.92"></a>
<FONT color="green">093</FONT>       * @param &lt;V1&gt; the map's input value type<a name="line.93"></a>
<FONT color="green">094</FONT>       * @param &lt;K2&gt; the map's output key type<a name="line.94"></a>
<FONT color="green">095</FONT>       * @param &lt;V2&gt; the map's output value type<a name="line.95"></a>
<FONT color="green">096</FONT>       * @param job the job<a name="line.96"></a>
<FONT color="green">097</FONT>       * @return the mapper class to run<a name="line.97"></a>
<FONT color="green">098</FONT>       */<a name="line.98"></a>
<FONT color="green">099</FONT>      @SuppressWarnings("unchecked")<a name="line.99"></a>
<FONT color="green">100</FONT>      public static &lt;K1,V1,K2,V2&gt;<a name="line.100"></a>
<FONT color="green">101</FONT>      Class&lt;Mapper&lt;K1,V1,K2,V2&gt;&gt; getMapperClass(JobContext job) {<a name="line.101"></a>
<FONT color="green">102</FONT>        return (Class&lt;Mapper&lt;K1,V1,K2,V2&gt;&gt;) <a name="line.102"></a>
<FONT color="green">103</FONT>          job.getConfiguration().getClass(MAP_CLASS, Mapper.class);<a name="line.103"></a>
<FONT color="green">104</FONT>      }<a name="line.104"></a>
<FONT color="green">105</FONT>      <a name="line.105"></a>
<FONT color="green">106</FONT>      /**<a name="line.106"></a>
<FONT color="green">107</FONT>       * Set the application's mapper class.<a name="line.107"></a>
<FONT color="green">108</FONT>       * @param &lt;K1&gt; the map input key type<a name="line.108"></a>
<FONT color="green">109</FONT>       * @param &lt;V1&gt; the map input value type<a name="line.109"></a>
<FONT color="green">110</FONT>       * @param &lt;K2&gt; the map output key type<a name="line.110"></a>
<FONT color="green">111</FONT>       * @param &lt;V2&gt; the map output value type<a name="line.111"></a>
<FONT color="green">112</FONT>       * @param job the job to modify<a name="line.112"></a>
<FONT color="green">113</FONT>       * @param cls the class to use as the mapper<a name="line.113"></a>
<FONT color="green">114</FONT>       */<a name="line.114"></a>
<FONT color="green">115</FONT>      public static &lt;K1,V1,K2,V2&gt; <a name="line.115"></a>
<FONT color="green">116</FONT>      void setMapperClass(Job job, <a name="line.116"></a>
<FONT color="green">117</FONT>                          Class&lt;? extends Mapper&lt;K1,V1,K2,V2&gt;&gt; cls) {<a name="line.117"></a>
<FONT color="green">118</FONT>        if (MultithreadedMapper.class.isAssignableFrom(cls)) {<a name="line.118"></a>
<FONT color="green">119</FONT>          throw new IllegalArgumentException("Can't have recursive " + <a name="line.119"></a>
<FONT color="green">120</FONT>                                             "MultithreadedMapper instances.");<a name="line.120"></a>
<FONT color="green">121</FONT>        }<a name="line.121"></a>
<FONT color="green">122</FONT>        job.getConfiguration().setClass(MAP_CLASS, cls, Mapper.class);<a name="line.122"></a>
<FONT color="green">123</FONT>      }<a name="line.123"></a>
<FONT color="green">124</FONT>    <a name="line.124"></a>
<FONT color="green">125</FONT>      /**<a name="line.125"></a>
<FONT color="green">126</FONT>       * Run the application's maps using a thread pool.<a name="line.126"></a>
<FONT color="green">127</FONT>       */<a name="line.127"></a>
<FONT color="green">128</FONT>      @Override<a name="line.128"></a>
<FONT color="green">129</FONT>      public void run(Context context) throws IOException, InterruptedException {<a name="line.129"></a>
<FONT color="green">130</FONT>        outer = context;<a name="line.130"></a>
<FONT color="green">131</FONT>        int numberOfThreads = getNumberOfThreads(context);<a name="line.131"></a>
<FONT color="green">132</FONT>        mapClass = getMapperClass(context);<a name="line.132"></a>
<FONT color="green">133</FONT>        if (LOG.isDebugEnabled()) {<a name="line.133"></a>
<FONT color="green">134</FONT>          LOG.debug("Configuring multithread runner to use " + numberOfThreads + <a name="line.134"></a>
<FONT color="green">135</FONT>                    " threads");<a name="line.135"></a>
<FONT color="green">136</FONT>        }<a name="line.136"></a>
<FONT color="green">137</FONT>        <a name="line.137"></a>
<FONT color="green">138</FONT>        runners =  new ArrayList&lt;MapRunner&gt;(numberOfThreads);<a name="line.138"></a>
<FONT color="green">139</FONT>        for(int i=0; i &lt; numberOfThreads; ++i) {<a name="line.139"></a>
<FONT color="green">140</FONT>          MapRunner thread = new MapRunner(context);<a name="line.140"></a>
<FONT color="green">141</FONT>          thread.start();<a name="line.141"></a>
<FONT color="green">142</FONT>          runners.add(i, thread);<a name="line.142"></a>
<FONT color="green">143</FONT>        }<a name="line.143"></a>
<FONT color="green">144</FONT>        for(int i=0; i &lt; numberOfThreads; ++i) {<a name="line.144"></a>
<FONT color="green">145</FONT>          MapRunner thread = runners.get(i);<a name="line.145"></a>
<FONT color="green">146</FONT>          thread.join();<a name="line.146"></a>
<FONT color="green">147</FONT>          Throwable th = thread.throwable;<a name="line.147"></a>
<FONT color="green">148</FONT>          if (th != null) {<a name="line.148"></a>
<FONT color="green">149</FONT>            if (th instanceof IOException) {<a name="line.149"></a>
<FONT color="green">150</FONT>              throw (IOException) th;<a name="line.150"></a>
<FONT color="green">151</FONT>            } else if (th instanceof InterruptedException) {<a name="line.151"></a>
<FONT color="green">152</FONT>              throw (InterruptedException) th;<a name="line.152"></a>
<FONT color="green">153</FONT>            } else {<a name="line.153"></a>
<FONT color="green">154</FONT>              throw new RuntimeException(th);<a name="line.154"></a>
<FONT color="green">155</FONT>            }<a name="line.155"></a>
<FONT color="green">156</FONT>          }<a name="line.156"></a>
<FONT color="green">157</FONT>        }<a name="line.157"></a>
<FONT color="green">158</FONT>      }<a name="line.158"></a>
<FONT color="green">159</FONT>    <a name="line.159"></a>
<FONT color="green">160</FONT>      private class SubMapRecordReader extends RecordReader&lt;K1,V1&gt; {<a name="line.160"></a>
<FONT color="green">161</FONT>        private K1 key;<a name="line.161"></a>
<FONT color="green">162</FONT>        private V1 value;<a name="line.162"></a>
<FONT color="green">163</FONT>        private Configuration conf;<a name="line.163"></a>
<FONT color="green">164</FONT>    <a name="line.164"></a>
<FONT color="green">165</FONT>        @Override<a name="line.165"></a>
<FONT color="green">166</FONT>        public void close() throws IOException {<a name="line.166"></a>
<FONT color="green">167</FONT>        }<a name="line.167"></a>
<FONT color="green">168</FONT>    <a name="line.168"></a>
<FONT color="green">169</FONT>        @Override<a name="line.169"></a>
<FONT color="green">170</FONT>        public float getProgress() throws IOException, InterruptedException {<a name="line.170"></a>
<FONT color="green">171</FONT>          return 0;<a name="line.171"></a>
<FONT color="green">172</FONT>        }<a name="line.172"></a>
<FONT color="green">173</FONT>    <a name="line.173"></a>
<FONT color="green">174</FONT>        @Override<a name="line.174"></a>
<FONT color="green">175</FONT>        public void initialize(InputSplit split, <a name="line.175"></a>
<FONT color="green">176</FONT>                               TaskAttemptContext context<a name="line.176"></a>
<FONT color="green">177</FONT>                               ) throws IOException, InterruptedException {<a name="line.177"></a>
<FONT color="green">178</FONT>          conf = context.getConfiguration();<a name="line.178"></a>
<FONT color="green">179</FONT>        }<a name="line.179"></a>
<FONT color="green">180</FONT>    <a name="line.180"></a>
<FONT color="green">181</FONT>    <a name="line.181"></a>
<FONT color="green">182</FONT>        @Override<a name="line.182"></a>
<FONT color="green">183</FONT>        public boolean nextKeyValue() throws IOException, InterruptedException {<a name="line.183"></a>
<FONT color="green">184</FONT>          synchronized (outer) {<a name="line.184"></a>
<FONT color="green">185</FONT>            if (!outer.nextKeyValue()) {<a name="line.185"></a>
<FONT color="green">186</FONT>              return false;<a name="line.186"></a>
<FONT color="green">187</FONT>            }<a name="line.187"></a>
<FONT color="green">188</FONT>            key = ReflectionUtils.copy(outer.getConfiguration(),<a name="line.188"></a>
<FONT color="green">189</FONT>                                       outer.getCurrentKey(), key);<a name="line.189"></a>
<FONT color="green">190</FONT>            value = ReflectionUtils.copy(conf, outer.getCurrentValue(), value);<a name="line.190"></a>
<FONT color="green">191</FONT>            return true;<a name="line.191"></a>
<FONT color="green">192</FONT>          }<a name="line.192"></a>
<FONT color="green">193</FONT>        }<a name="line.193"></a>
<FONT color="green">194</FONT>    <a name="line.194"></a>
<FONT color="green">195</FONT>        public K1 getCurrentKey() {<a name="line.195"></a>
<FONT color="green">196</FONT>          return key;<a name="line.196"></a>
<FONT color="green">197</FONT>        }<a name="line.197"></a>
<FONT color="green">198</FONT>    <a name="line.198"></a>
<FONT color="green">199</FONT>        @Override<a name="line.199"></a>
<FONT color="green">200</FONT>        public V1 getCurrentValue() {<a name="line.200"></a>
<FONT color="green">201</FONT>          return value;<a name="line.201"></a>
<FONT color="green">202</FONT>        }<a name="line.202"></a>
<FONT color="green">203</FONT>      }<a name="line.203"></a>
<FONT color="green">204</FONT>      <a name="line.204"></a>
<FONT color="green">205</FONT>      private class SubMapRecordWriter extends RecordWriter&lt;K2,V2&gt; {<a name="line.205"></a>
<FONT color="green">206</FONT>    <a name="line.206"></a>
<FONT color="green">207</FONT>        @Override<a name="line.207"></a>
<FONT color="green">208</FONT>        public void close(TaskAttemptContext context) throws IOException,<a name="line.208"></a>
<FONT color="green">209</FONT>                                                     InterruptedException {<a name="line.209"></a>
<FONT color="green">210</FONT>        }<a name="line.210"></a>
<FONT color="green">211</FONT>    <a name="line.211"></a>
<FONT color="green">212</FONT>        @Override<a name="line.212"></a>
<FONT color="green">213</FONT>        public void write(K2 key, V2 value) throws IOException,<a name="line.213"></a>
<FONT color="green">214</FONT>                                                   InterruptedException {<a name="line.214"></a>
<FONT color="green">215</FONT>          synchronized (outer) {<a name="line.215"></a>
<FONT color="green">216</FONT>            outer.write(key, value);<a name="line.216"></a>
<FONT color="green">217</FONT>          }<a name="line.217"></a>
<FONT color="green">218</FONT>        }  <a name="line.218"></a>
<FONT color="green">219</FONT>      }<a name="line.219"></a>
<FONT color="green">220</FONT>    <a name="line.220"></a>
<FONT color="green">221</FONT>      private class SubMapStatusReporter extends StatusReporter {<a name="line.221"></a>
<FONT color="green">222</FONT>    <a name="line.222"></a>
<FONT color="green">223</FONT>        @Override<a name="line.223"></a>
<FONT color="green">224</FONT>        public Counter getCounter(Enum&lt;?&gt; name) {<a name="line.224"></a>
<FONT color="green">225</FONT>          return outer.getCounter(name);<a name="line.225"></a>
<FONT color="green">226</FONT>        }<a name="line.226"></a>
<FONT color="green">227</FONT>    <a name="line.227"></a>
<FONT color="green">228</FONT>        @Override<a name="line.228"></a>
<FONT color="green">229</FONT>        public Counter getCounter(String group, String name) {<a name="line.229"></a>
<FONT color="green">230</FONT>          return outer.getCounter(group, name);<a name="line.230"></a>
<FONT color="green">231</FONT>        }<a name="line.231"></a>
<FONT color="green">232</FONT>    <a name="line.232"></a>
<FONT color="green">233</FONT>        @Override<a name="line.233"></a>
<FONT color="green">234</FONT>        public void progress() {<a name="line.234"></a>
<FONT color="green">235</FONT>          outer.progress();<a name="line.235"></a>
<FONT color="green">236</FONT>        }<a name="line.236"></a>
<FONT color="green">237</FONT>    <a name="line.237"></a>
<FONT color="green">238</FONT>        @Override<a name="line.238"></a>
<FONT color="green">239</FONT>        public void setStatus(String status) {<a name="line.239"></a>
<FONT color="green">240</FONT>          outer.setStatus(status);<a name="line.240"></a>
<FONT color="green">241</FONT>        }<a name="line.241"></a>
<FONT color="green">242</FONT>        <a name="line.242"></a>
<FONT color="green">243</FONT>        @Override<a name="line.243"></a>
<FONT color="green">244</FONT>        public float getProgress() {<a name="line.244"></a>
<FONT color="green">245</FONT>          return outer.getProgress();<a name="line.245"></a>
<FONT color="green">246</FONT>        }<a name="line.246"></a>
<FONT color="green">247</FONT>      }<a name="line.247"></a>
<FONT color="green">248</FONT>    <a name="line.248"></a>
<FONT color="green">249</FONT>      private class MapRunner extends Thread {<a name="line.249"></a>
<FONT color="green">250</FONT>        private Mapper&lt;K1,V1,K2,V2&gt; mapper;<a name="line.250"></a>
<FONT color="green">251</FONT>        private Context subcontext;<a name="line.251"></a>
<FONT color="green">252</FONT>        private Throwable throwable;<a name="line.252"></a>
<FONT color="green">253</FONT>        private RecordReader&lt;K1,V1&gt; reader = new SubMapRecordReader();<a name="line.253"></a>
<FONT color="green">254</FONT>    <a name="line.254"></a>
<FONT color="green">255</FONT>        MapRunner(Context context) throws IOException, InterruptedException {<a name="line.255"></a>
<FONT color="green">256</FONT>          mapper = ReflectionUtils.newInstance(mapClass, <a name="line.256"></a>
<FONT color="green">257</FONT>                                               context.getConfiguration());<a name="line.257"></a>
<FONT color="green">258</FONT>          MapContext&lt;K1, V1, K2, V2&gt; mapContext = <a name="line.258"></a>
<FONT color="green">259</FONT>            new MapContextImpl&lt;K1, V1, K2, V2&gt;(outer.getConfiguration(), <a name="line.259"></a>
<FONT color="green">260</FONT>                                               outer.getTaskAttemptID(),<a name="line.260"></a>
<FONT color="green">261</FONT>                                               reader,<a name="line.261"></a>
<FONT color="green">262</FONT>                                               new SubMapRecordWriter(), <a name="line.262"></a>
<FONT color="green">263</FONT>                                               context.getOutputCommitter(),<a name="line.263"></a>
<FONT color="green">264</FONT>                                               new SubMapStatusReporter(),<a name="line.264"></a>
<FONT color="green">265</FONT>                                               outer.getInputSplit());<a name="line.265"></a>
<FONT color="green">266</FONT>          subcontext = new WrappedMapper&lt;K1, V1, K2, V2&gt;().getMapContext(mapContext);<a name="line.266"></a>
<FONT color="green">267</FONT>          reader.initialize(context.getInputSplit(), context);<a name="line.267"></a>
<FONT color="green">268</FONT>        }<a name="line.268"></a>
<FONT color="green">269</FONT>    <a name="line.269"></a>
<FONT color="green">270</FONT>        @Override<a name="line.270"></a>
<FONT color="green">271</FONT>        public void run() {<a name="line.271"></a>
<FONT color="green">272</FONT>          try {<a name="line.272"></a>
<FONT color="green">273</FONT>            mapper.run(subcontext);<a name="line.273"></a>
<FONT color="green">274</FONT>            reader.close();<a name="line.274"></a>
<FONT color="green">275</FONT>          } catch (Throwable ie) {<a name="line.275"></a>
<FONT color="green">276</FONT>            throwable = ie;<a name="line.276"></a>
<FONT color="green">277</FONT>          }<a name="line.277"></a>
<FONT color="green">278</FONT>        }<a name="line.278"></a>
<FONT color="green">279</FONT>      }<a name="line.279"></a>
<FONT color="green">280</FONT>    <a name="line.280"></a>
<FONT color="green">281</FONT>    }<a name="line.281"></a>




























































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