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| 7 | RecordReader (Hadoop 0.20.1 API) |
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| 88 | <!-- ======== START OF CLASS DATA ======== --> |
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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 RecordReader<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/ComposableRecordReader.html" title="interface in org.apache.hadoop.mapred.join">ComposableRecordReader</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/CombineFileRecordReader.html" title="class in org.apache.hadoop.mapred.lib">CombineFileRecordReader</A>, <A HREF="../../../../org/apache/hadoop/mapred/lib/db/DBInputFormat.DBRecordReader.html" title="class in org.apache.hadoop.mapred.lib.db">DBInputFormat.DBRecordReader</A>, <A HREF="../../../../org/apache/hadoop/mapred/join/InnerJoinRecordReader.html" title="class in org.apache.hadoop.mapred.join">InnerJoinRecordReader</A>, <A HREF="../../../../org/apache/hadoop/mapred/join/JoinRecordReader.html" title="class in org.apache.hadoop.mapred.join">JoinRecordReader</A>, <A HREF="../../../../org/apache/hadoop/mapred/KeyValueLineRecordReader.html" title="class in org.apache.hadoop.mapred">KeyValueLineRecordReader</A>, <A HREF="../../../../org/apache/hadoop/contrib/index/example/LineDocRecordReader.html" title="class in org.apache.hadoop.contrib.index.example">LineDocRecordReader</A>, <A HREF="../../../../org/apache/hadoop/mapred/LineRecordReader.html" title="class in org.apache.hadoop.mapred">LineRecordReader</A>, <A HREF="../../../../org/apache/hadoop/examples/MultiFileWordCount.MultiFileLineRecordReader.html" title="class in org.apache.hadoop.examples">MultiFileWordCount.MultiFileLineRecordReader</A>, <A HREF="../../../../org/apache/hadoop/mapred/join/MultiFilterRecordReader.html" title="class in org.apache.hadoop.mapred.join">MultiFilterRecordReader</A>, <A HREF="../../../../org/apache/hadoop/mapred/join/OuterJoinRecordReader.html" title="class in org.apache.hadoop.mapred.join">OuterJoinRecordReader</A>, <A HREF="../../../../org/apache/hadoop/mapred/join/OverrideRecordReader.html" title="class in org.apache.hadoop.mapred.join">OverrideRecordReader</A>, <A HREF="../../../../org/apache/hadoop/mapred/SequenceFileAsBinaryInputFormat.SequenceFileAsBinaryRecordReader.html" title="class in org.apache.hadoop.mapred">SequenceFileAsBinaryInputFormat.SequenceFileAsBinaryRecordReader</A>, <A HREF="../../../../org/apache/hadoop/mapred/SequenceFileAsTextRecordReader.html" title="class in org.apache.hadoop.mapred">SequenceFileAsTextRecordReader</A>, <A HREF="../../../../org/apache/hadoop/mapred/SequenceFileRecordReader.html" title="class in org.apache.hadoop.mapred">SequenceFileRecordReader</A>, <A HREF="../../../../org/apache/hadoop/streaming/StreamBaseRecordReader.html" title="class in org.apache.hadoop.streaming">StreamBaseRecordReader</A>, <A HREF="../../../../org/apache/hadoop/streaming/StreamXmlRecordReader.html" title="class in org.apache.hadoop.streaming">StreamXmlRecordReader</A>, <A HREF="../../../../org/apache/hadoop/mapred/join/WrappedRecordReader.html" title="class in org.apache.hadoop.mapred.join">WrappedRecordReader</A></DD> |
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| 99 | </DL> |
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| 100 | <HR> |
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| 101 | <DL> |
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| 102 | <DT><PRE>public interface <B>RecordReader<K,V></B></DL> |
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| 103 | </PRE> |
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| 104 | |
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| 105 | <P> |
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| 106 | <code>RecordReader</code> reads <key, value> pairs from an |
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| 107 | <A HREF="../../../../org/apache/hadoop/mapred/InputSplit.html" title="interface in org.apache.hadoop.mapred"><CODE>InputSplit</CODE></A>. |
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| 108 | |
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| 109 | <p><code>RecordReader</code>, typically, converts the byte-oriented view of |
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| 110 | the input, provided by the <code>InputSplit</code>, and presents a |
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| 111 | record-oriented view for the <A HREF="../../../../org/apache/hadoop/mapred/Mapper.html" title="interface in org.apache.hadoop.mapred"><CODE>Mapper</CODE></A> & <A HREF="../../../../org/apache/hadoop/mapred/Reducer.html" title="interface in org.apache.hadoop.mapred"><CODE>Reducer</CODE></A> tasks for |
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| 112 | processing. It thus assumes the responsibility of processing record |
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| 113 | boundaries and presenting the tasks with keys and values.</p> |
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| 114 | <P> |
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| 115 | |
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| 116 | <P> |
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| 117 | <DL> |
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| 118 | <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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| 119 | <A HREF="../../../../org/apache/hadoop/mapred/InputFormat.html" title="interface in org.apache.hadoop.mapred"><CODE>InputFormat</CODE></A></DL> |
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| 120 | <HR> |
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| 121 | |
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| 122 | <P> |
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| 123 | |
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| 124 | <!-- ========== METHOD SUMMARY =========== --> |
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| 125 | |
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| 128 | <TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"> |
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| 129 | <TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2"> |
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| 130 | <B>Method Summary</B></FONT></TH> |
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| 131 | </TR> |
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| 132 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 133 | <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
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| 134 | <CODE> void</CODE></FONT></TD> |
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| 135 | <TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/RecordReader.html#close()">close</A></B>()</CODE> |
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| 136 | |
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| 137 | <BR> |
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| 138 | Close this <A HREF="../../../../org/apache/hadoop/mapred/InputSplit.html" title="interface in org.apache.hadoop.mapred"><CODE>InputSplit</CODE></A> to future operations.</TD> |
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| 139 | </TR> |
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| 140 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 141 | <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
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| 142 | <CODE> <A HREF="../../../../org/apache/hadoop/mapred/RecordReader.html" title="type parameter in RecordReader">K</A></CODE></FONT></TD> |
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| 143 | <TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/RecordReader.html#createKey()">createKey</A></B>()</CODE> |
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| 144 | |
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| 145 | <BR> |
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| 146 | Create an object of the appropriate type to be used as a key.</TD> |
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| 147 | </TR> |
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| 148 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 149 | <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
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| 150 | <CODE> <A HREF="../../../../org/apache/hadoop/mapred/RecordReader.html" title="type parameter in RecordReader">V</A></CODE></FONT></TD> |
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| 151 | <TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/RecordReader.html#createValue()">createValue</A></B>()</CODE> |
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| 152 | |
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| 153 | <BR> |
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| 154 | Create an object of the appropriate type to be used as a value.</TD> |
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| 155 | </TR> |
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| 156 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 157 | <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
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| 158 | <CODE> long</CODE></FONT></TD> |
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| 159 | <TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/RecordReader.html#getPos()">getPos</A></B>()</CODE> |
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| 160 | |
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| 161 | <BR> |
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| 162 | Returns the current position in the input.</TD> |
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| 163 | </TR> |
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| 164 | <TR BGCOLOR="white" CLASS="TableRowColor"> |
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| 165 | <TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"> |
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| 166 | <CODE> float</CODE></FONT></TD> |
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| 167 | <TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/RecordReader.html#getProgress()">getProgress</A></B>()</CODE> |
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| 168 | |
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| 169 | <BR> |
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| 170 | How much of the input has the <A HREF="../../../../org/apache/hadoop/mapred/RecordReader.html" title="interface in org.apache.hadoop.mapred"><CODE>RecordReader</CODE></A> consumed i.e.</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> boolean</CODE></FONT></TD> |
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| 175 | <TD><CODE><B><A HREF="../../../../org/apache/hadoop/mapred/RecordReader.html#next(K, V)">next</A></B>(<A HREF="../../../../org/apache/hadoop/mapred/RecordReader.html" title="type parameter in RecordReader">K</A> key, |
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| 176 | <A HREF="../../../../org/apache/hadoop/mapred/RecordReader.html" title="type parameter in RecordReader">V</A> value)</CODE> |
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| 177 | |
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| 178 | <BR> |
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| 179 | Reads the next key/value pair from the input for processing.</TD> |
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| 180 | </TR> |
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| 181 | </TABLE> |
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| 182 | |
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| 183 | <P> |
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| 184 | |
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| 185 | <!-- ============ METHOD DETAIL ========== --> |
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| 186 | |
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| 187 | <A NAME="method_detail"><!-- --></A> |
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| 188 | <TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""> |
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| 189 | <TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"> |
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| 190 | <TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2"> |
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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="next(java.lang.Object,java.lang.Object)"><!-- --></A><A NAME="next(K, V)"><!-- --></A><H3> |
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| 196 | next</H3> |
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| 197 | <PRE> |
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| 198 | boolean <B>next</B>(<A HREF="../../../../org/apache/hadoop/mapred/RecordReader.html" title="type parameter in RecordReader">K</A> key, |
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| 199 | <A HREF="../../../../org/apache/hadoop/mapred/RecordReader.html" title="type parameter in RecordReader">V</A> value) |
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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>Reads the next key/value pair from the input for processing. |
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| 203 | <P> |
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| 204 | <DD><DL> |
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| 205 | <DT><B>Parameters:</B><DD><CODE>key</CODE> - the key to read data into<DD><CODE>value</CODE> - the value to read data into |
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| 206 | <DT><B>Returns:</B><DD>true iff a key/value was read, false if at EOF |
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| 207 | <DT><B>Throws:</B> |
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| 208 | <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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| 209 | </DD> |
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| 210 | </DL> |
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| 211 | <HR> |
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| 212 | |
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| 213 | <A NAME="createKey()"><!-- --></A><H3> |
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| 214 | createKey</H3> |
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| 215 | <PRE> |
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| 216 | <A HREF="../../../../org/apache/hadoop/mapred/RecordReader.html" title="type parameter in RecordReader">K</A> <B>createKey</B>()</PRE> |
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| 217 | <DL> |
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| 218 | <DD>Create an object of the appropriate type to be used as a key. |
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| 219 | <P> |
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| 220 | <DD><DL> |
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| 221 | |
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| 222 | <DT><B>Returns:</B><DD>a new key object.</DL> |
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| 223 | </DD> |
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| 224 | </DL> |
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| 225 | <HR> |
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| 226 | |
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| 227 | <A NAME="createValue()"><!-- --></A><H3> |
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| 228 | createValue</H3> |
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| 229 | <PRE> |
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| 230 | <A HREF="../../../../org/apache/hadoop/mapred/RecordReader.html" title="type parameter in RecordReader">V</A> <B>createValue</B>()</PRE> |
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| 231 | <DL> |
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| 232 | <DD>Create an object of the appropriate type to be used as a value. |
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| 233 | <P> |
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| 234 | <DD><DL> |
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| 235 | |
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| 236 | <DT><B>Returns:</B><DD>a new value object.</DL> |
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| 237 | </DD> |
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| 238 | </DL> |
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| 239 | <HR> |
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| 240 | |
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| 241 | <A NAME="getPos()"><!-- --></A><H3> |
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| 242 | getPos</H3> |
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| 243 | <PRE> |
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| 244 | long <B>getPos</B>() |
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| 245 | 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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| 246 | <DL> |
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| 247 | <DD>Returns the current position in the input. |
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| 248 | <P> |
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| 249 | <DD><DL> |
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| 250 | |
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| 251 | <DT><B>Returns:</B><DD>the current position in the input. |
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| 252 | <DT><B>Throws:</B> |
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| 253 | <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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| 254 | </DD> |
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| 255 | </DL> |
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| 256 | <HR> |
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| 257 | |
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| 258 | <A NAME="close()"><!-- --></A><H3> |
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| 259 | close</H3> |
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| 260 | <PRE> |
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| 261 | void <B>close</B>() |
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| 262 | 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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| 263 | <DL> |
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| 264 | <DD>Close this <A HREF="../../../../org/apache/hadoop/mapred/InputSplit.html" title="interface in org.apache.hadoop.mapred"><CODE>InputSplit</CODE></A> to future operations. |
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| 265 | <P> |
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| 266 | <DD><DL> |
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| 267 | |
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| 268 | <DT><B>Throws:</B> |
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| 269 | <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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| 270 | </DD> |
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| 271 | </DL> |
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| 272 | <HR> |
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| 273 | |
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| 274 | <A NAME="getProgress()"><!-- --></A><H3> |
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| 275 | getProgress</H3> |
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| 276 | <PRE> |
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| 277 | float <B>getProgress</B>() |
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| 278 | 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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| 279 | <DL> |
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| 280 | <DD>How much of the input has the <A HREF="../../../../org/apache/hadoop/mapred/RecordReader.html" title="interface in org.apache.hadoop.mapred"><CODE>RecordReader</CODE></A> consumed i.e. |
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| 281 | has been processed by? |
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| 282 | <P> |
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| 283 | <DD><DL> |
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| 284 | |
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| 285 | <DT><B>Returns:</B><DD>progress from <code>0.0</code> to <code>1.0</code>. |
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| 286 | <DT><B>Throws:</B> |
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| 287 | <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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| 288 | </DD> |
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| 289 | </DL> |
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| 290 | <!-- ========= END OF CLASS DATA ========= --> |
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| 291 | <HR> |
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| 292 | |
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| 293 | |
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| 294 | <!-- ======= START OF BOTTOM NAVBAR ====== --> |
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| 295 | <A NAME="navbar_bottom"><!-- --></A> |
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| 296 | <A HREF="#skip-navbar_bottom" title="Skip navigation links"></A> |
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| 297 | <TABLE BORDER="0" WIDTH="100%" CELLPADDING="1" CELLSPACING="0" SUMMARY=""> |
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| 298 | <TR> |
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| 300 | <A NAME="navbar_bottom_firstrow"><!-- --></A> |
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| 302 | <TR ALIGN="center" VALIGN="top"> |
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| 303 | <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../../overview-summary.html"><FONT CLASS="NavBarFont1"><B>Overview</B></FONT></A> </TD> |
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| 304 | <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-summary.html"><FONT CLASS="NavBarFont1"><B>Package</B></FONT></A> </TD> |
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| 306 | <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="class-use/RecordReader.html"><FONT CLASS="NavBarFont1"><B>Use</B></FONT></A> </TD> |
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| 315 | </EM> |
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| 316 | </TD> |
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| 317 | </TR> |
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| 318 | |
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| 319 | <TR> |
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| 320 | <TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> |
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