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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.input;<a name="line.19"></a>
<FONT color="green">020</FONT>    <a name="line.20"></a>
<FONT color="green">021</FONT>    import java.io.IOException;<a name="line.21"></a>
<FONT color="green">022</FONT>    import java.nio.ByteBuffer;<a name="line.22"></a>
<FONT color="green">023</FONT>    import java.security.DigestException;<a name="line.23"></a>
<FONT color="green">024</FONT>    import java.security.MessageDigest;<a name="line.24"></a>
<FONT color="green">025</FONT>    import java.security.NoSuchAlgorithmException;<a name="line.25"></a>
<FONT color="green">026</FONT>    import java.util.regex.Pattern;<a name="line.26"></a>
<FONT color="green">027</FONT>    import java.util.regex.PatternSyntaxException;<a name="line.27"></a>
<FONT color="green">028</FONT>    <a name="line.28"></a>
<FONT color="green">029</FONT>    import org.apache.commons.logging.Log;<a name="line.29"></a>
<FONT color="green">030</FONT>    import org.apache.commons.logging.LogFactory;<a name="line.30"></a>
<FONT color="green">031</FONT>    import org.apache.hadoop.classification.InterfaceAudience;<a name="line.31"></a>
<FONT color="green">032</FONT>    import org.apache.hadoop.classification.InterfaceStability;<a name="line.32"></a>
<FONT color="green">033</FONT>    import org.apache.hadoop.conf.Configurable;<a name="line.33"></a>
<FONT color="green">034</FONT>    import org.apache.hadoop.conf.Configuration;<a name="line.34"></a>
<FONT color="green">035</FONT>    import org.apache.hadoop.io.BytesWritable;<a name="line.35"></a>
<FONT color="green">036</FONT>    import org.apache.hadoop.io.Text;<a name="line.36"></a>
<FONT color="green">037</FONT>    import org.apache.hadoop.mapreduce.InputSplit;<a name="line.37"></a>
<FONT color="green">038</FONT>    import org.apache.hadoop.mapreduce.Job;<a name="line.38"></a>
<FONT color="green">039</FONT>    import org.apache.hadoop.mapreduce.RecordReader;<a name="line.39"></a>
<FONT color="green">040</FONT>    import org.apache.hadoop.mapreduce.TaskAttemptContext;<a name="line.40"></a>
<FONT color="green">041</FONT>    import org.apache.hadoop.util.ReflectionUtils;<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>     * A class that allows a map/red job to work on a sample of sequence files.<a name="line.44"></a>
<FONT color="green">045</FONT>     * The sample is decided by the filter class set by the job.<a name="line.45"></a>
<FONT color="green">046</FONT>     */<a name="line.46"></a>
<FONT color="green">047</FONT>    @InterfaceAudience.Public<a name="line.47"></a>
<FONT color="green">048</FONT>    @InterfaceStability.Stable<a name="line.48"></a>
<FONT color="green">049</FONT>    public class SequenceFileInputFilter&lt;K, V&gt;<a name="line.49"></a>
<FONT color="green">050</FONT>        extends SequenceFileInputFormat&lt;K, V&gt; {<a name="line.50"></a>
<FONT color="green">051</FONT>      public static final Log LOG = LogFactory.getLog(FileInputFormat.class);<a name="line.51"></a>
<FONT color="green">052</FONT>      <a name="line.52"></a>
<FONT color="green">053</FONT>      final public static String FILTER_CLASS = <a name="line.53"></a>
<FONT color="green">054</FONT>        "mapreduce.input.sequencefileinputfilter.class";<a name="line.54"></a>
<FONT color="green">055</FONT>      final public static String FILTER_FREQUENCY = <a name="line.55"></a>
<FONT color="green">056</FONT>        "mapreduce.input.sequencefileinputfilter.frequency";<a name="line.56"></a>
<FONT color="green">057</FONT>      final public static String FILTER_REGEX = <a name="line.57"></a>
<FONT color="green">058</FONT>        "mapreduce.input.sequencefileinputfilter.regex";<a name="line.58"></a>
<FONT color="green">059</FONT>        <a name="line.59"></a>
<FONT color="green">060</FONT>      public SequenceFileInputFilter() {<a name="line.60"></a>
<FONT color="green">061</FONT>      }<a name="line.61"></a>
<FONT color="green">062</FONT>        <a name="line.62"></a>
<FONT color="green">063</FONT>      /** Create a record reader for the given split<a name="line.63"></a>
<FONT color="green">064</FONT>       * @param split file split<a name="line.64"></a>
<FONT color="green">065</FONT>       * @param context the task-attempt context<a name="line.65"></a>
<FONT color="green">066</FONT>       * @return RecordReader<a name="line.66"></a>
<FONT color="green">067</FONT>       */<a name="line.67"></a>
<FONT color="green">068</FONT>      public RecordReader&lt;K, V&gt; createRecordReader(InputSplit split,<a name="line.68"></a>
<FONT color="green">069</FONT>          TaskAttemptContext context) throws IOException {<a name="line.69"></a>
<FONT color="green">070</FONT>        context.setStatus(split.toString());<a name="line.70"></a>
<FONT color="green">071</FONT>        return new FilterRecordReader&lt;K, V&gt;(context.getConfiguration());<a name="line.71"></a>
<FONT color="green">072</FONT>      }<a name="line.72"></a>
<FONT color="green">073</FONT>    <a name="line.73"></a>
<FONT color="green">074</FONT>    <a name="line.74"></a>
<FONT color="green">075</FONT>      /** set the filter class<a name="line.75"></a>
<FONT color="green">076</FONT>       * <a name="line.76"></a>
<FONT color="green">077</FONT>       * @param job The job<a name="line.77"></a>
<FONT color="green">078</FONT>       * @param filterClass filter class<a name="line.78"></a>
<FONT color="green">079</FONT>       */<a name="line.79"></a>
<FONT color="green">080</FONT>      public static void setFilterClass(Job job, Class&lt;?&gt; filterClass) {<a name="line.80"></a>
<FONT color="green">081</FONT>        job.getConfiguration().set(FILTER_CLASS, filterClass.getName());<a name="line.81"></a>
<FONT color="green">082</FONT>      }<a name="line.82"></a>
<FONT color="green">083</FONT>    <a name="line.83"></a>
<FONT color="green">084</FONT>             <a name="line.84"></a>
<FONT color="green">085</FONT>      /**<a name="line.85"></a>
<FONT color="green">086</FONT>       * filter interface<a name="line.86"></a>
<FONT color="green">087</FONT>       */<a name="line.87"></a>
<FONT color="green">088</FONT>      public interface Filter extends Configurable {<a name="line.88"></a>
<FONT color="green">089</FONT>        /** filter function<a name="line.89"></a>
<FONT color="green">090</FONT>         * Decide if a record should be filtered or not<a name="line.90"></a>
<FONT color="green">091</FONT>         * @param key record key<a name="line.91"></a>
<FONT color="green">092</FONT>         * @return true if a record is accepted; return false otherwise<a name="line.92"></a>
<FONT color="green">093</FONT>         */<a name="line.93"></a>
<FONT color="green">094</FONT>        public abstract boolean accept(Object key);<a name="line.94"></a>
<FONT color="green">095</FONT>      }<a name="line.95"></a>
<FONT color="green">096</FONT>        <a name="line.96"></a>
<FONT color="green">097</FONT>      /**<a name="line.97"></a>
<FONT color="green">098</FONT>       * base class for Filters<a name="line.98"></a>
<FONT color="green">099</FONT>       */<a name="line.99"></a>
<FONT color="green">100</FONT>      public static abstract class FilterBase implements Filter {<a name="line.100"></a>
<FONT color="green">101</FONT>        Configuration conf;<a name="line.101"></a>
<FONT color="green">102</FONT>            <a name="line.102"></a>
<FONT color="green">103</FONT>        public Configuration getConf() {<a name="line.103"></a>
<FONT color="green">104</FONT>          return conf;<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>        <a name="line.107"></a>
<FONT color="green">108</FONT>      /** Records filter by matching key to regex<a name="line.108"></a>
<FONT color="green">109</FONT>       */<a name="line.109"></a>
<FONT color="green">110</FONT>      public static class RegexFilter extends FilterBase {<a name="line.110"></a>
<FONT color="green">111</FONT>        private Pattern p;<a name="line.111"></a>
<FONT color="green">112</FONT>        /** Define the filtering regex and stores it in conf<a name="line.112"></a>
<FONT color="green">113</FONT>         * @param conf where the regex is set<a name="line.113"></a>
<FONT color="green">114</FONT>         * @param regex regex used as a filter<a name="line.114"></a>
<FONT color="green">115</FONT>         */<a name="line.115"></a>
<FONT color="green">116</FONT>        public static void setPattern(Configuration conf, String regex)<a name="line.116"></a>
<FONT color="green">117</FONT>            throws PatternSyntaxException {<a name="line.117"></a>
<FONT color="green">118</FONT>          try {<a name="line.118"></a>
<FONT color="green">119</FONT>            Pattern.compile(regex);<a name="line.119"></a>
<FONT color="green">120</FONT>          } catch (PatternSyntaxException e) {<a name="line.120"></a>
<FONT color="green">121</FONT>            throw new IllegalArgumentException("Invalid pattern: "+regex);<a name="line.121"></a>
<FONT color="green">122</FONT>          }<a name="line.122"></a>
<FONT color="green">123</FONT>          conf.set(FILTER_REGEX, regex);<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>        public RegexFilter() { }<a name="line.126"></a>
<FONT color="green">127</FONT>            <a name="line.127"></a>
<FONT color="green">128</FONT>        /** configure the Filter by checking the configuration<a name="line.128"></a>
<FONT color="green">129</FONT>         */<a name="line.129"></a>
<FONT color="green">130</FONT>        public void setConf(Configuration conf) {<a name="line.130"></a>
<FONT color="green">131</FONT>          String regex = conf.get(FILTER_REGEX);<a name="line.131"></a>
<FONT color="green">132</FONT>          if (regex == null)<a name="line.132"></a>
<FONT color="green">133</FONT>            throw new RuntimeException(FILTER_REGEX + "not set");<a name="line.133"></a>
<FONT color="green">134</FONT>          this.p = Pattern.compile(regex);<a name="line.134"></a>
<FONT color="green">135</FONT>          this.conf = conf;<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>    <a name="line.138"></a>
<FONT color="green">139</FONT>        /** Filtering method<a name="line.139"></a>
<FONT color="green">140</FONT>         * If key matches the regex, return true; otherwise return false<a name="line.140"></a>
<FONT color="green">141</FONT>         * @see Filter#accept(Object)<a name="line.141"></a>
<FONT color="green">142</FONT>         */<a name="line.142"></a>
<FONT color="green">143</FONT>        public boolean accept(Object key) {<a name="line.143"></a>
<FONT color="green">144</FONT>          return p.matcher(key.toString()).matches();<a name="line.144"></a>
<FONT color="green">145</FONT>        }<a name="line.145"></a>
<FONT color="green">146</FONT>      }<a name="line.146"></a>
<FONT color="green">147</FONT>    <a name="line.147"></a>
<FONT color="green">148</FONT>      /** This class returns a percentage of records<a name="line.148"></a>
<FONT color="green">149</FONT>       * The percentage is determined by a filtering frequency &lt;i&gt;f&lt;/i&gt; using<a name="line.149"></a>
<FONT color="green">150</FONT>       * the criteria record# % f == 0.<a name="line.150"></a>
<FONT color="green">151</FONT>       * For example, if the frequency is 10, one out of 10 records is returned.<a name="line.151"></a>
<FONT color="green">152</FONT>       */<a name="line.152"></a>
<FONT color="green">153</FONT>      public static class PercentFilter extends FilterBase {<a name="line.153"></a>
<FONT color="green">154</FONT>        private int frequency;<a name="line.154"></a>
<FONT color="green">155</FONT>        private int count;<a name="line.155"></a>
<FONT color="green">156</FONT>    <a name="line.156"></a>
<FONT color="green">157</FONT>        /** set the frequency and stores it in conf<a name="line.157"></a>
<FONT color="green">158</FONT>         * @param conf configuration<a name="line.158"></a>
<FONT color="green">159</FONT>         * @param frequency filtering frequencey<a name="line.159"></a>
<FONT color="green">160</FONT>         */<a name="line.160"></a>
<FONT color="green">161</FONT>        public static void setFrequency(Configuration conf, int frequency) {<a name="line.161"></a>
<FONT color="green">162</FONT>          if (frequency &lt;= 0)<a name="line.162"></a>
<FONT color="green">163</FONT>            throw new IllegalArgumentException(<a name="line.163"></a>
<FONT color="green">164</FONT>              "Negative " + FILTER_FREQUENCY + ": " + frequency);<a name="line.164"></a>
<FONT color="green">165</FONT>          conf.setInt(FILTER_FREQUENCY, frequency);<a name="line.165"></a>
<FONT color="green">166</FONT>        }<a name="line.166"></a>
<FONT color="green">167</FONT>            <a name="line.167"></a>
<FONT color="green">168</FONT>        public PercentFilter() { }<a name="line.168"></a>
<FONT color="green">169</FONT>            <a name="line.169"></a>
<FONT color="green">170</FONT>        /** configure the filter by checking the configuration<a name="line.170"></a>
<FONT color="green">171</FONT>         * <a name="line.171"></a>
<FONT color="green">172</FONT>         * @param conf configuration<a name="line.172"></a>
<FONT color="green">173</FONT>         */<a name="line.173"></a>
<FONT color="green">174</FONT>        public void setConf(Configuration conf) {<a name="line.174"></a>
<FONT color="green">175</FONT>          this.frequency = conf.getInt(FILTER_FREQUENCY, 10);<a name="line.175"></a>
<FONT color="green">176</FONT>          if (this.frequency &lt;= 0) {<a name="line.176"></a>
<FONT color="green">177</FONT>            throw new RuntimeException(<a name="line.177"></a>
<FONT color="green">178</FONT>              "Negative "+FILTER_FREQUENCY + ": " + this.frequency);<a name="line.178"></a>
<FONT color="green">179</FONT>          }<a name="line.179"></a>
<FONT color="green">180</FONT>          this.conf = conf;<a name="line.180"></a>
<FONT color="green">181</FONT>        }<a name="line.181"></a>
<FONT color="green">182</FONT>    <a name="line.182"></a>
<FONT color="green">183</FONT>        /** Filtering method<a name="line.183"></a>
<FONT color="green">184</FONT>         * If record# % frequency==0, return true; otherwise return false<a name="line.184"></a>
<FONT color="green">185</FONT>         * @see Filter#accept(Object)<a name="line.185"></a>
<FONT color="green">186</FONT>         */<a name="line.186"></a>
<FONT color="green">187</FONT>        public boolean accept(Object key) {<a name="line.187"></a>
<FONT color="green">188</FONT>          boolean accepted = false;<a name="line.188"></a>
<FONT color="green">189</FONT>          if (count == 0)<a name="line.189"></a>
<FONT color="green">190</FONT>            accepted = true;<a name="line.190"></a>
<FONT color="green">191</FONT>          if (++count == frequency) {<a name="line.191"></a>
<FONT color="green">192</FONT>            count = 0;<a name="line.192"></a>
<FONT color="green">193</FONT>          }<a name="line.193"></a>
<FONT color="green">194</FONT>          return accepted;<a name="line.194"></a>
<FONT color="green">195</FONT>        }<a name="line.195"></a>
<FONT color="green">196</FONT>      }<a name="line.196"></a>
<FONT color="green">197</FONT>    <a name="line.197"></a>
<FONT color="green">198</FONT>      /** This class returns a set of records by examing the MD5 digest of its<a name="line.198"></a>
<FONT color="green">199</FONT>       * key against a filtering frequency &lt;i&gt;f&lt;/i&gt;. The filtering criteria is<a name="line.199"></a>
<FONT color="green">200</FONT>       * MD5(key) % f == 0.<a name="line.200"></a>
<FONT color="green">201</FONT>       */<a name="line.201"></a>
<FONT color="green">202</FONT>      public static class MD5Filter extends FilterBase {<a name="line.202"></a>
<FONT color="green">203</FONT>        private int frequency;<a name="line.203"></a>
<FONT color="green">204</FONT>        private static final MessageDigest DIGESTER;<a name="line.204"></a>
<FONT color="green">205</FONT>        public static final int MD5_LEN = 16;<a name="line.205"></a>
<FONT color="green">206</FONT>        private byte [] digest = new byte[MD5_LEN];<a name="line.206"></a>
<FONT color="green">207</FONT>            <a name="line.207"></a>
<FONT color="green">208</FONT>        static {<a name="line.208"></a>
<FONT color="green">209</FONT>          try {<a name="line.209"></a>
<FONT color="green">210</FONT>            DIGESTER = MessageDigest.getInstance("MD5");<a name="line.210"></a>
<FONT color="green">211</FONT>          } catch (NoSuchAlgorithmException e) {<a name="line.211"></a>
<FONT color="green">212</FONT>            throw new RuntimeException(e);<a name="line.212"></a>
<FONT color="green">213</FONT>          }<a name="line.213"></a>
<FONT color="green">214</FONT>        }<a name="line.214"></a>
<FONT color="green">215</FONT>    <a name="line.215"></a>
<FONT color="green">216</FONT>    <a name="line.216"></a>
<FONT color="green">217</FONT>        /** set the filtering frequency in configuration<a name="line.217"></a>
<FONT color="green">218</FONT>         * <a name="line.218"></a>
<FONT color="green">219</FONT>         * @param conf configuration<a name="line.219"></a>
<FONT color="green">220</FONT>         * @param frequency filtering frequency<a name="line.220"></a>
<FONT color="green">221</FONT>         */<a name="line.221"></a>
<FONT color="green">222</FONT>        public static void setFrequency(Configuration conf, int frequency) {<a name="line.222"></a>
<FONT color="green">223</FONT>          if (frequency &lt;= 0)<a name="line.223"></a>
<FONT color="green">224</FONT>            throw new IllegalArgumentException(<a name="line.224"></a>
<FONT color="green">225</FONT>              "Negative " + FILTER_FREQUENCY + ": " + frequency);<a name="line.225"></a>
<FONT color="green">226</FONT>          conf.setInt(FILTER_FREQUENCY, frequency);<a name="line.226"></a>
<FONT color="green">227</FONT>        }<a name="line.227"></a>
<FONT color="green">228</FONT>            <a name="line.228"></a>
<FONT color="green">229</FONT>        public MD5Filter() { }<a name="line.229"></a>
<FONT color="green">230</FONT>            <a name="line.230"></a>
<FONT color="green">231</FONT>        /** configure the filter according to configuration<a name="line.231"></a>
<FONT color="green">232</FONT>         * <a name="line.232"></a>
<FONT color="green">233</FONT>         * @param conf configuration<a name="line.233"></a>
<FONT color="green">234</FONT>         */<a name="line.234"></a>
<FONT color="green">235</FONT>        public void setConf(Configuration conf) {<a name="line.235"></a>
<FONT color="green">236</FONT>          this.frequency = conf.getInt(FILTER_FREQUENCY, 10);<a name="line.236"></a>
<FONT color="green">237</FONT>          if (this.frequency &lt;= 0) {<a name="line.237"></a>
<FONT color="green">238</FONT>            throw new RuntimeException(<a name="line.238"></a>
<FONT color="green">239</FONT>              "Negative " + FILTER_FREQUENCY + ": " + this.frequency);<a name="line.239"></a>
<FONT color="green">240</FONT>          }<a name="line.240"></a>
<FONT color="green">241</FONT>          this.conf = conf;<a name="line.241"></a>
<FONT color="green">242</FONT>        }<a name="line.242"></a>
<FONT color="green">243</FONT>    <a name="line.243"></a>
<FONT color="green">244</FONT>        /** Filtering method<a name="line.244"></a>
<FONT color="green">245</FONT>         * If MD5(key) % frequency==0, return true; otherwise return false<a name="line.245"></a>
<FONT color="green">246</FONT>         * @see Filter#accept(Object)<a name="line.246"></a>
<FONT color="green">247</FONT>         */<a name="line.247"></a>
<FONT color="green">248</FONT>        public boolean accept(Object key) {<a name="line.248"></a>
<FONT color="green">249</FONT>          try {<a name="line.249"></a>
<FONT color="green">250</FONT>            long hashcode;<a name="line.250"></a>
<FONT color="green">251</FONT>            if (key instanceof Text) {<a name="line.251"></a>
<FONT color="green">252</FONT>              hashcode = MD5Hashcode((Text)key);<a name="line.252"></a>
<FONT color="green">253</FONT>            } else if (key instanceof BytesWritable) {<a name="line.253"></a>
<FONT color="green">254</FONT>              hashcode = MD5Hashcode((BytesWritable)key);<a name="line.254"></a>
<FONT color="green">255</FONT>            } else {<a name="line.255"></a>
<FONT color="green">256</FONT>              ByteBuffer bb;<a name="line.256"></a>
<FONT color="green">257</FONT>              bb = Text.encode(key.toString());<a name="line.257"></a>
<FONT color="green">258</FONT>              hashcode = MD5Hashcode(bb.array(), 0, bb.limit());<a name="line.258"></a>
<FONT color="green">259</FONT>            }<a name="line.259"></a>
<FONT color="green">260</FONT>            if (hashcode / frequency * frequency == hashcode)<a name="line.260"></a>
<FONT color="green">261</FONT>              return true;<a name="line.261"></a>
<FONT color="green">262</FONT>          } catch(Exception e) {<a name="line.262"></a>
<FONT color="green">263</FONT>            LOG.warn(e);<a name="line.263"></a>
<FONT color="green">264</FONT>            throw new RuntimeException(e);<a name="line.264"></a>
<FONT color="green">265</FONT>          }<a name="line.265"></a>
<FONT color="green">266</FONT>          return false;<a name="line.266"></a>
<FONT color="green">267</FONT>        }<a name="line.267"></a>
<FONT color="green">268</FONT>            <a name="line.268"></a>
<FONT color="green">269</FONT>        private long MD5Hashcode(Text key) throws DigestException {<a name="line.269"></a>
<FONT color="green">270</FONT>          return MD5Hashcode(key.getBytes(), 0, key.getLength());<a name="line.270"></a>
<FONT color="green">271</FONT>        }<a name="line.271"></a>
<FONT color="green">272</FONT>            <a name="line.272"></a>
<FONT color="green">273</FONT>        private long MD5Hashcode(BytesWritable key) throws DigestException {<a name="line.273"></a>
<FONT color="green">274</FONT>          return MD5Hashcode(key.getBytes(), 0, key.getLength());<a name="line.274"></a>
<FONT color="green">275</FONT>        }<a name="line.275"></a>
<FONT color="green">276</FONT>        <a name="line.276"></a>
<FONT color="green">277</FONT>        synchronized private long MD5Hashcode(byte[] bytes, <a name="line.277"></a>
<FONT color="green">278</FONT>            int start, int length) throws DigestException {<a name="line.278"></a>
<FONT color="green">279</FONT>          DIGESTER.update(bytes, 0, length);<a name="line.279"></a>
<FONT color="green">280</FONT>          DIGESTER.digest(digest, 0, MD5_LEN);<a name="line.280"></a>
<FONT color="green">281</FONT>          long hashcode=0;<a name="line.281"></a>
<FONT color="green">282</FONT>          for (int i = 0; i &lt; 8; i++)<a name="line.282"></a>
<FONT color="green">283</FONT>            hashcode |= ((digest[i] &amp; 0xffL) &lt;&lt; (8 * (7 - i)));<a name="line.283"></a>
<FONT color="green">284</FONT>          return hashcode;<a name="line.284"></a>
<FONT color="green">285</FONT>        }<a name="line.285"></a>
<FONT color="green">286</FONT>      }<a name="line.286"></a>
<FONT color="green">287</FONT>        <a name="line.287"></a>
<FONT color="green">288</FONT>      private static class FilterRecordReader&lt;K, V&gt;<a name="line.288"></a>
<FONT color="green">289</FONT>          extends SequenceFileRecordReader&lt;K, V&gt; {<a name="line.289"></a>
<FONT color="green">290</FONT>        <a name="line.290"></a>
<FONT color="green">291</FONT>        private Filter filter;<a name="line.291"></a>
<FONT color="green">292</FONT>        private K key;<a name="line.292"></a>
<FONT color="green">293</FONT>        private V value;<a name="line.293"></a>
<FONT color="green">294</FONT>            <a name="line.294"></a>
<FONT color="green">295</FONT>        public FilterRecordReader(Configuration conf)<a name="line.295"></a>
<FONT color="green">296</FONT>            throws IOException {<a name="line.296"></a>
<FONT color="green">297</FONT>          super();<a name="line.297"></a>
<FONT color="green">298</FONT>          // instantiate filter<a name="line.298"></a>
<FONT color="green">299</FONT>          filter = (Filter)ReflectionUtils.newInstance(<a name="line.299"></a>
<FONT color="green">300</FONT>            conf.getClass(FILTER_CLASS, PercentFilter.class), conf);<a name="line.300"></a>
<FONT color="green">301</FONT>        }<a name="line.301"></a>
<FONT color="green">302</FONT>        <a name="line.302"></a>
<FONT color="green">303</FONT>        public synchronized boolean nextKeyValue() <a name="line.303"></a>
<FONT color="green">304</FONT>            throws IOException, InterruptedException {<a name="line.304"></a>
<FONT color="green">305</FONT>          while (super.nextKeyValue()) {<a name="line.305"></a>
<FONT color="green">306</FONT>            key = super.getCurrentKey();<a name="line.306"></a>
<FONT color="green">307</FONT>            if (filter.accept(key)) {<a name="line.307"></a>
<FONT color="green">308</FONT>              value = super.getCurrentValue();<a name="line.308"></a>
<FONT color="green">309</FONT>              return true;<a name="line.309"></a>
<FONT color="green">310</FONT>            }<a name="line.310"></a>
<FONT color="green">311</FONT>          }<a name="line.311"></a>
<FONT color="green">312</FONT>          return false;<a name="line.312"></a>
<FONT color="green">313</FONT>        }<a name="line.313"></a>
<FONT color="green">314</FONT>        <a name="line.314"></a>
<FONT color="green">315</FONT>        @Override<a name="line.315"></a>
<FONT color="green">316</FONT>        public K getCurrentKey() {<a name="line.316"></a>
<FONT color="green">317</FONT>          return key;<a name="line.317"></a>
<FONT color="green">318</FONT>        }<a name="line.318"></a>
<FONT color="green">319</FONT>        <a name="line.319"></a>
<FONT color="green">320</FONT>        @Override<a name="line.320"></a>
<FONT color="green">321</FONT>        public V getCurrentValue() {<a name="line.321"></a>
<FONT color="green">322</FONT>          return value;<a name="line.322"></a>
<FONT color="green">323</FONT>        }<a name="line.323"></a>
<FONT color="green">324</FONT>      }<a name="line.324"></a>
<FONT color="green">325</FONT>    }<a name="line.325"></a>




























































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