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7 | DelegatingInputFormat (Hadoop 0.20.1 API) |
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91 | org.apache.hadoop.mapred.lib</FONT> |
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92 | <BR> |
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93 | Class DelegatingInputFormat<K,V></H2> |
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94 | <PRE> |
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95 | <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</A> |
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96 | <IMG SRC="../../../../../resources/inherit.gif" ALT="extended by "><B>org.apache.hadoop.mapred.lib.DelegatingInputFormat<K,V></B> |
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97 | </PRE> |
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98 | <DL> |
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99 | <DT><B>All Implemented Interfaces:</B> <DD><A HREF="../../../../../org/apache/hadoop/mapred/InputFormat.html" title="interface in org.apache.hadoop.mapred">InputFormat</A><K,V></DD> |
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100 | </DL> |
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102 | <DL> |
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103 | <DT><PRE>public class <B>DelegatingInputFormat<K,V></B><DT>extends <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A><DT>implements <A HREF="../../../../../org/apache/hadoop/mapred/InputFormat.html" title="interface in org.apache.hadoop.mapred">InputFormat</A><K,V></DL> |
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104 | </PRE> |
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105 | |
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106 | <P> |
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107 | An <A HREF="../../../../../org/apache/hadoop/mapred/InputFormat.html" title="interface in org.apache.hadoop.mapred"><CODE>InputFormat</CODE></A> that delegates behaviour of paths to multiple other |
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108 | InputFormats. |
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109 | <P> |
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110 | |
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111 | <P> |
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112 | <DL> |
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113 | <DT><B>See Also:</B><DD><A HREF="../../../../../org/apache/hadoop/mapred/lib/MultipleInputs.html#addInputPath(org.apache.hadoop.mapred.JobConf, org.apache.hadoop.fs.Path, java.lang.Class, java.lang.Class)"><CODE>MultipleInputs.addInputPath(JobConf, Path, Class, Class)</CODE></A></DL> |
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127 | <TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/DelegatingInputFormat.html#DelegatingInputFormat()">DelegatingInputFormat</A></B>()</CODE> |
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128 | |
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144 | <CODE> <A HREF="../../../../../org/apache/hadoop/mapred/RecordReader.html" title="interface in org.apache.hadoop.mapred">RecordReader</A><<A HREF="../../../../../org/apache/hadoop/mapred/lib/DelegatingInputFormat.html" title="type parameter in DelegatingInputFormat">K</A>,<A HREF="../../../../../org/apache/hadoop/mapred/lib/DelegatingInputFormat.html" title="type parameter in DelegatingInputFormat">V</A>></CODE></FONT></TD> |
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145 | <TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/DelegatingInputFormat.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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146 | <A HREF="../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A> conf, |
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147 | <A HREF="../../../../../org/apache/hadoop/mapred/Reporter.html" title="interface in org.apache.hadoop.mapred">Reporter</A> reporter)</CODE> |
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148 | |
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149 | <BR> |
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150 | 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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151 | </TR> |
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152 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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153 | <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
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154 | <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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155 | <TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/lib/DelegatingInputFormat.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> conf, |
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156 | int numSplits)</CODE> |
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157 | |
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158 | <BR> |
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159 | Logically split the set of input files for the job.</TD> |
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160 | </TR> |
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161 | </TABLE> |
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169 | </TR> |
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172 | <P> |
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173 | |
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174 | <!-- ========= CONSTRUCTOR DETAIL ======== --> |
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181 | </TR> |
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182 | </TABLE> |
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183 | |
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184 | <A NAME="DelegatingInputFormat()"><!-- --></A><H3> |
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185 | DelegatingInputFormat</H3> |
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186 | <PRE> |
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187 | public <B>DelegatingInputFormat</B>()</PRE> |
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188 | <DL> |
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189 | </DL> |
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190 | |
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191 | <!-- ============ METHOD DETAIL ========== --> |
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197 | <B>Method Detail</B></FONT></TH> |
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198 | </TR> |
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199 | </TABLE> |
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200 | |
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201 | <A NAME="getSplits(org.apache.hadoop.mapred.JobConf, int)"><!-- --></A><H3> |
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202 | getSplits</H3> |
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203 | <PRE> |
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204 | public <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> conf, |
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205 | int numSplits) |
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206 | 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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207 | <DL> |
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208 | <DD><B>Description copied from interface: <CODE><A HREF="../../../../../org/apache/hadoop/mapred/InputFormat.html#getSplits(org.apache.hadoop.mapred.JobConf, int)">InputFormat</A></CODE></B></DD> |
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209 | <DD>Logically split the set of input files for the job. |
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210 | |
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211 | <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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212 | for processing.</p> |
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213 | |
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214 | <p><i>Note</i>: The split is a <i>logical</i> split of the inputs and the |
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215 | input files are not physically split into chunks. For e.g. a split could |
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216 | be <i><input-file-path, start, offset></i> tuple. |
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217 | <P> |
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218 | <DD><DL> |
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219 | <DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../org/apache/hadoop/mapred/InputFormat.html#getSplits(org.apache.hadoop.mapred.JobConf, int)">getSplits</A></CODE> in interface <CODE><A HREF="../../../../../org/apache/hadoop/mapred/InputFormat.html" title="interface in org.apache.hadoop.mapred">InputFormat</A><<A HREF="../../../../../org/apache/hadoop/mapred/lib/DelegatingInputFormat.html" title="type parameter in DelegatingInputFormat">K</A>,<A HREF="../../../../../org/apache/hadoop/mapred/lib/DelegatingInputFormat.html" title="type parameter in DelegatingInputFormat">V</A>></CODE></DL> |
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220 | </DD> |
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221 | <DD><DL> |
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222 | <DT><B>Parameters:</B><DD><CODE>conf</CODE> - job configuration.<DD><CODE>numSplits</CODE> - the desired number of splits, a hint. |
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223 | <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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224 | <DT><B>Throws:</B> |
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225 | <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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226 | </DD> |
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227 | </DL> |
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228 | <HR> |
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229 | |
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230 | <A NAME="getRecordReader(org.apache.hadoop.mapred.InputSplit, org.apache.hadoop.mapred.JobConf, org.apache.hadoop.mapred.Reporter)"><!-- --></A><H3> |
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231 | getRecordReader</H3> |
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232 | <PRE> |
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233 | public <A HREF="../../../../../org/apache/hadoop/mapred/RecordReader.html" title="interface in org.apache.hadoop.mapred">RecordReader</A><<A HREF="../../../../../org/apache/hadoop/mapred/lib/DelegatingInputFormat.html" title="type parameter in DelegatingInputFormat">K</A>,<A HREF="../../../../../org/apache/hadoop/mapred/lib/DelegatingInputFormat.html" title="type parameter in DelegatingInputFormat">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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234 | <A HREF="../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A> conf, |
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235 | <A HREF="../../../../../org/apache/hadoop/mapred/Reporter.html" title="interface in org.apache.hadoop.mapred">Reporter</A> reporter) |
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236 | 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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237 | <DL> |
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238 | <DD><B>Description copied from interface: <CODE><A HREF="../../../../../org/apache/hadoop/mapred/InputFormat.html#getRecordReader(org.apache.hadoop.mapred.InputSplit, org.apache.hadoop.mapred.JobConf, org.apache.hadoop.mapred.Reporter)">InputFormat</A></CODE></B></DD> |
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239 | <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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240 | |
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241 | <p>It is the responsibility of the <code>RecordReader</code> to respect |
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242 | record boundaries while processing the logical split to present a |
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243 | record-oriented view to the individual task.</p> |
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244 | <P> |
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245 | <DD><DL> |
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246 | <DT><B>Specified by:</B><DD><CODE><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></CODE> in interface <CODE><A HREF="../../../../../org/apache/hadoop/mapred/InputFormat.html" title="interface in org.apache.hadoop.mapred">InputFormat</A><<A HREF="../../../../../org/apache/hadoop/mapred/lib/DelegatingInputFormat.html" title="type parameter in DelegatingInputFormat">K</A>,<A HREF="../../../../../org/apache/hadoop/mapred/lib/DelegatingInputFormat.html" title="type parameter in DelegatingInputFormat">V</A>></CODE></DL> |
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247 | </DD> |
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248 | <DD><DL> |
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249 | <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>conf</CODE> - the job that this split belongs to |
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250 | <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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251 | <DT><B>Throws:</B> |
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252 | <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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253 | </DD> |
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