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7 | InputFormat (Hadoop 0.20.1 API) |
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89 | <H2> |
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90 | <FONT SIZE="-1"> |
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91 | org.apache.hadoop.mapred</FONT> |
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92 | <BR> |
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93 | Interface InputFormat<K,V></H2> |
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94 | <DL> |
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95 | <DT><B>All Known Subinterfaces:</B> <DD><A HREF="../../../../org/apache/hadoop/mapred/join/ComposableInputFormat.html" title="interface in org.apache.hadoop.mapred.join">ComposableInputFormat</A><K,V></DD> |
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96 | </DL> |
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97 | <DL> |
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98 | <DT><B>All Known Implementing Classes:</B> <DD><A HREF="../../../../org/apache/hadoop/mapred/lib/CombineFileInputFormat.html" title="class in org.apache.hadoop.mapred.lib">CombineFileInputFormat</A>, <A HREF="../../../../org/apache/hadoop/mapred/join/CompositeInputFormat.html" title="class in org.apache.hadoop.mapred.join">CompositeInputFormat</A>, <A HREF="../../../../org/apache/hadoop/mapred/lib/db/DBInputFormat.html" title="class in org.apache.hadoop.mapred.lib.db">DBInputFormat</A>, <A HREF="../../../../org/apache/hadoop/mapred/lib/DelegatingInputFormat.html" title="class in org.apache.hadoop.mapred.lib">DelegatingInputFormat</A>, <A HREF="../../../../org/apache/hadoop/mapred/FileInputFormat.html" title="class in org.apache.hadoop.mapred">FileInputFormat</A>, <A HREF="../../../../org/apache/hadoop/mapred/KeyValueTextInputFormat.html" title="class in org.apache.hadoop.mapred">KeyValueTextInputFormat</A>, <A HREF="../../../../org/apache/hadoop/contrib/index/example/LineDocInputFormat.html" title="class in org.apache.hadoop.contrib.index.example">LineDocInputFormat</A>, <A HREF="../../../../org/apache/hadoop/mapred/MultiFileInputFormat.html" title="class in org.apache.hadoop.mapred">MultiFileInputFormat</A>, <A HREF="../../../../org/apache/hadoop/examples/MultiFileWordCount.MyInputFormat.html" title="class in org.apache.hadoop.examples">MultiFileWordCount.MyInputFormat</A>, <A HREF="../../../../org/apache/hadoop/mapred/lib/NLineInputFormat.html" title="class in org.apache.hadoop.mapred.lib">NLineInputFormat</A>, <A HREF="../../../../org/apache/hadoop/mapred/join/Parser.Node.html" title="class in org.apache.hadoop.mapred.join">Parser.Node</A>, <A HREF="../../../../org/apache/hadoop/mapred/SequenceFileAsBinaryInputFormat.html" title="class in org.apache.hadoop.mapred">SequenceFileAsBinaryInputFormat</A>, <A HREF="../../../../org/apache/hadoop/mapred/SequenceFileAsTextInputFormat.html" title="class in org.apache.hadoop.mapred">SequenceFileAsTextInputFormat</A>, <A HREF="../../../../org/apache/hadoop/mapred/SequenceFileInputFilter.html" title="class in org.apache.hadoop.mapred">SequenceFileInputFilter</A>, <A HREF="../../../../org/apache/hadoop/mapred/SequenceFileInputFormat.html" title="class in org.apache.hadoop.mapred">SequenceFileInputFormat</A>, <A HREF="../../../../org/apache/hadoop/examples/SleepJob.SleepInputFormat.html" title="class in org.apache.hadoop.examples">SleepJob.SleepInputFormat</A>, <A HREF="../../../../org/apache/hadoop/streaming/StreamInputFormat.html" title="class in org.apache.hadoop.streaming">StreamInputFormat</A>, <A HREF="../../../../org/apache/hadoop/examples/terasort/TeraInputFormat.html" title="class in org.apache.hadoop.examples.terasort">TeraInputFormat</A>, <A HREF="../../../../org/apache/hadoop/mapred/TextInputFormat.html" title="class in org.apache.hadoop.mapred">TextInputFormat</A></DD> |
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99 | </DL> |
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100 | <HR> |
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101 | <B>Deprecated.</B> <I>Use <A HREF="../../../../org/apache/hadoop/mapreduce/InputFormat.html" title="class in org.apache.hadoop.mapreduce"><CODE>InputFormat</CODE></A> instead.</I> |
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102 | <P> |
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103 | <DL> |
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104 | <DT><PRE><FONT SIZE="-1"><A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Deprecated.html?is-external=true" title="class or interface in java.lang">@Deprecated</A> |
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105 | </FONT>public interface <B>InputFormat<K,V></B></DL> |
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106 | </PRE> |
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107 | |
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108 | <P> |
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109 | <code>InputFormat</code> describes the input-specification for a |
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110 | Map-Reduce job. |
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111 | |
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112 | <p>The Map-Reduce framework relies on the <code>InputFormat</code> of the |
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113 | job to:<p> |
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114 | <ol> |
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115 | <li> |
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116 | Validate the input-specification of the job. |
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117 | <li> |
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118 | Split-up the input file(s) into logical <A HREF="../../../../org/apache/hadoop/mapred/InputSplit.html" title="interface in org.apache.hadoop.mapred"><CODE>InputSplit</CODE></A>s, each of |
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119 | which is then assigned to an individual <A HREF="../../../../org/apache/hadoop/mapred/Mapper.html" title="interface in org.apache.hadoop.mapred"><CODE>Mapper</CODE></A>. |
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120 | </li> |
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121 | <li> |
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122 | Provide the <A HREF="../../../../org/apache/hadoop/mapred/RecordReader.html" title="interface in org.apache.hadoop.mapred"><CODE>RecordReader</CODE></A> implementation to be used to glean |
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123 | input records from the logical <code>InputSplit</code> for processing by |
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124 | the <A HREF="../../../../org/apache/hadoop/mapred/Mapper.html" title="interface in org.apache.hadoop.mapred"><CODE>Mapper</CODE></A>. |
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125 | </li> |
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126 | </ol> |
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127 | |
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128 | <p>The default behavior of file-based <A HREF="../../../../org/apache/hadoop/mapred/InputFormat.html" title="interface in org.apache.hadoop.mapred"><CODE>InputFormat</CODE></A>s, typically |
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129 | sub-classes of <A HREF="../../../../org/apache/hadoop/mapred/FileInputFormat.html" title="class in org.apache.hadoop.mapred"><CODE>FileInputFormat</CODE></A>, is to split the |
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130 | input into <i>logical</i> <A HREF="../../../../org/apache/hadoop/mapred/InputSplit.html" title="interface in org.apache.hadoop.mapred"><CODE>InputSplit</CODE></A>s based on the total size, in |
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131 | bytes, of the input files. However, the <A HREF="../../../../org/apache/hadoop/fs/FileSystem.html" title="class in org.apache.hadoop.fs"><CODE>FileSystem</CODE></A> blocksize of |
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132 | the input files is treated as an upper bound for input splits. A lower bound |
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133 | on the split size can be set via |
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134 | <a href="../../../../../mapred-default.html#mapred.min.split.size"> |
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135 | mapred.min.split.size</a>.</p> |
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136 | |
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137 | <p>Clearly, logical splits based on input-size is insufficient for many |
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138 | applications since record boundaries are to respected. In such cases, the |
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139 | application has to also implement a <A HREF="../../../../org/apache/hadoop/mapred/RecordReader.html" title="interface in org.apache.hadoop.mapred"><CODE>RecordReader</CODE></A> on whom lies the |
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140 | responsibilty to respect record-boundaries and present a record-oriented |
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141 | view of the logical <code>InputSplit</code> to the individual task. |
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142 | <P> |
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143 | |
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144 | <P> |
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145 | <DL> |
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146 | <DT><B>See Also:</B><DD><A HREF="../../../../org/apache/hadoop/mapred/InputSplit.html" title="interface in org.apache.hadoop.mapred"><CODE>InputSplit</CODE></A>, |
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147 | <A HREF="../../../../org/apache/hadoop/mapred/RecordReader.html" title="interface in org.apache.hadoop.mapred"><CODE>RecordReader</CODE></A>, |
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148 | <A HREF="../../../../org/apache/hadoop/mapred/JobClient.html" title="class in org.apache.hadoop.mapred"><CODE>JobClient</CODE></A>, |
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149 | <A HREF="../../../../org/apache/hadoop/mapred/FileInputFormat.html" title="class in org.apache.hadoop.mapred"><CODE>FileInputFormat</CODE></A></DL> |
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150 | <HR> |
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163 | <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
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164 | <CODE> <A HREF="../../../../org/apache/hadoop/mapred/RecordReader.html" title="interface in org.apache.hadoop.mapred">RecordReader</A><<A HREF="../../../../org/apache/hadoop/mapred/InputFormat.html" title="type parameter in InputFormat">K</A>,<A HREF="../../../../org/apache/hadoop/mapred/InputFormat.html" title="type parameter in InputFormat">V</A>></CODE></FONT></TD> |
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165 | <TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/InputFormat.html#getRecordReader(org.apache.hadoop.mapred.InputSplit, org.apache.hadoop.mapred.JobConf, org.apache.hadoop.mapred.Reporter)">getRecordReader</A></B>(<A HREF="../../../../org/apache/hadoop/mapred/InputSplit.html" title="interface in org.apache.hadoop.mapred">InputSplit</A> split, |
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166 | <A HREF="../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A> job, |
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167 | <A HREF="../../../../org/apache/hadoop/mapred/Reporter.html" title="interface in org.apache.hadoop.mapred">Reporter</A> reporter)</CODE> |
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168 | |
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169 | <BR> |
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170 | <B>Deprecated.</B> Get the <A HREF="../../../../org/apache/hadoop/mapred/RecordReader.html" title="interface in org.apache.hadoop.mapred"><CODE>RecordReader</CODE></A> for the given <A HREF="../../../../org/apache/hadoop/mapred/InputSplit.html" title="interface in org.apache.hadoop.mapred"><CODE>InputSplit</CODE></A>.</TD> |
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171 | </TR> |
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172 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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173 | <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
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174 | <CODE> <A HREF="../../../../org/apache/hadoop/mapred/InputSplit.html" title="interface in org.apache.hadoop.mapred">InputSplit</A>[]</CODE></FONT></TD> |
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175 | <TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/InputFormat.html#getSplits(org.apache.hadoop.mapred.JobConf, int)">getSplits</A></B>(<A HREF="../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A> job, |
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176 | int numSplits)</CODE> |
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177 | |
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178 | <BR> |
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179 | <B>Deprecated.</B> Logically split the set of input files for the job.</TD> |
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180 | </TR> |
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181 | </TABLE> |
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182 | |
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191 | <B>Method Detail</B></FONT></TH> |
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192 | </TR> |
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193 | </TABLE> |
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194 | |
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195 | <A NAME="getSplits(org.apache.hadoop.mapred.JobConf, int)"><!-- --></A><H3> |
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196 | getSplits</H3> |
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197 | <PRE> |
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198 | <A HREF="../../../../org/apache/hadoop/mapred/InputSplit.html" title="interface in org.apache.hadoop.mapred">InputSplit</A>[] <B>getSplits</B>(<A HREF="../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A> job, |
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199 | int numSplits) |
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200 | throws <A HREF="http://java.sun.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</A></PRE> |
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201 | <DL> |
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202 | <DD><B>Deprecated.</B> <DD>Logically split the set of input files for the job. |
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203 | |
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204 | <p>Each <A HREF="../../../../org/apache/hadoop/mapred/InputSplit.html" title="interface in org.apache.hadoop.mapred"><CODE>InputSplit</CODE></A> is then assigned to an individual <A HREF="../../../../org/apache/hadoop/mapred/Mapper.html" title="interface in org.apache.hadoop.mapred"><CODE>Mapper</CODE></A> |
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205 | for processing.</p> |
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206 | |
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207 | <p><i>Note</i>: The split is a <i>logical</i> split of the inputs and the |
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208 | input files are not physically split into chunks. For e.g. a split could |
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209 | be <i><input-file-path, start, offset></i> tuple. |
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210 | <P> |
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211 | <DD><DL> |
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212 | <DT><B>Parameters:</B><DD><CODE>job</CODE> - job configuration.<DD><CODE>numSplits</CODE> - the desired number of splits, a hint. |
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213 | <DT><B>Returns:</B><DD>an array of <A HREF="../../../../org/apache/hadoop/mapred/InputSplit.html" title="interface in org.apache.hadoop.mapred"><CODE>InputSplit</CODE></A>s for the job. |
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214 | <DT><B>Throws:</B> |
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215 | <DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</A></CODE></DL> |
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216 | </DD> |
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217 | </DL> |
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218 | <HR> |
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219 | |
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220 | <A NAME="getRecordReader(org.apache.hadoop.mapred.InputSplit, org.apache.hadoop.mapred.JobConf, org.apache.hadoop.mapred.Reporter)"><!-- --></A><H3> |
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221 | getRecordReader</H3> |
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222 | <PRE> |
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223 | <A HREF="../../../../org/apache/hadoop/mapred/RecordReader.html" title="interface in org.apache.hadoop.mapred">RecordReader</A><<A HREF="../../../../org/apache/hadoop/mapred/InputFormat.html" title="type parameter in InputFormat">K</A>,<A HREF="../../../../org/apache/hadoop/mapred/InputFormat.html" title="type parameter in InputFormat">V</A>> <B>getRecordReader</B>(<A HREF="../../../../org/apache/hadoop/mapred/InputSplit.html" title="interface in org.apache.hadoop.mapred">InputSplit</A> split, |
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224 | <A HREF="../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A> job, |
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225 | <A HREF="../../../../org/apache/hadoop/mapred/Reporter.html" title="interface in org.apache.hadoop.mapred">Reporter</A> reporter) |
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226 | throws <A HREF="http://java.sun.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</A></PRE> |
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227 | <DL> |
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228 | <DD><B>Deprecated.</B> <DD>Get the <A HREF="../../../../org/apache/hadoop/mapred/RecordReader.html" title="interface in org.apache.hadoop.mapred"><CODE>RecordReader</CODE></A> for the given <A HREF="../../../../org/apache/hadoop/mapred/InputSplit.html" title="interface in org.apache.hadoop.mapred"><CODE>InputSplit</CODE></A>. |
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229 | |
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230 | <p>It is the responsibility of the <code>RecordReader</code> to respect |
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231 | record boundaries while processing the logical split to present a |
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232 | record-oriented view to the individual task.</p> |
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233 | <P> |
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234 | <DD><DL> |
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235 | <DT><B>Parameters:</B><DD><CODE>split</CODE> - the <A HREF="../../../../org/apache/hadoop/mapred/InputSplit.html" title="interface in org.apache.hadoop.mapred"><CODE>InputSplit</CODE></A><DD><CODE>job</CODE> - the job that this split belongs to |
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236 | <DT><B>Returns:</B><DD>a <A HREF="../../../../org/apache/hadoop/mapred/RecordReader.html" title="interface in org.apache.hadoop.mapred"><CODE>RecordReader</CODE></A> |
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237 | <DT><B>Throws:</B> |
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238 | <DD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</A></CODE></DL> |
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239 | </DD> |
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