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7CompositeInputSplit (Hadoop 0.20.1 API)
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89<H2>
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91org.apache.hadoop.mapred.join</FONT>
92<BR>
93Class CompositeInputSplit</H2>
94<PRE>
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>
96  <IMG SRC="../../../../../resources/inherit.gif" ALT="extended by "><B>org.apache.hadoop.mapred.join.CompositeInputSplit</B>
97</PRE>
98<DL>
99<DT><B>All Implemented Interfaces:</B> <DD><A HREF="../../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</A>, <A HREF="../../../../../org/apache/hadoop/mapred/InputSplit.html" title="interface in org.apache.hadoop.mapred">InputSplit</A></DD>
100</DL>
101<HR>
102<DL>
103<DT><PRE>public class <B>CompositeInputSplit</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/InputSplit.html" title="interface in org.apache.hadoop.mapred">InputSplit</A></DL>
104</PRE>
105
106<P>
107This InputSplit contains a set of child InputSplits. Any InputSplit inserted
108 into this collection must have a public default constructor.
109<P>
110
111<P>
112<HR>
113
114<P>
115
116<!-- ======== CONSTRUCTOR SUMMARY ======== -->
117
118<A NAME="constructor_summary"><!-- --></A>
119<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
120<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
121<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
122<B>Constructor Summary</B></FONT></TH>
123</TR>
124<TR BGCOLOR="white" CLASS="TableRowColor">
125<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeInputSplit.html#CompositeInputSplit()">CompositeInputSplit</A></B>()</CODE>
126
127<BR>
128&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
129</TR>
130<TR BGCOLOR="white" CLASS="TableRowColor">
131<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeInputSplit.html#CompositeInputSplit(int)">CompositeInputSplit</A></B>(int&nbsp;capacity)</CODE>
132
133<BR>
134&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
135</TR>
136</TABLE>
137&nbsp;
138<!-- ========== METHOD SUMMARY =========== -->
139
140<A NAME="method_summary"><!-- --></A>
141<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
142<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
143<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
144<B>Method Summary</B></FONT></TH>
145</TR>
146<TR BGCOLOR="white" CLASS="TableRowColor">
147<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
148<CODE>&nbsp;void</CODE></FONT></TD>
149<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeInputSplit.html#add(org.apache.hadoop.mapred.InputSplit)">add</A></B>(<A HREF="../../../../../org/apache/hadoop/mapred/InputSplit.html" title="interface in org.apache.hadoop.mapred">InputSplit</A>&nbsp;s)</CODE>
150
151<BR>
152&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Add an InputSplit to this collection.</TD>
153</TR>
154<TR BGCOLOR="white" CLASS="TableRowColor">
155<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
156<CODE>&nbsp;<A HREF="../../../../../org/apache/hadoop/mapred/InputSplit.html" title="interface in org.apache.hadoop.mapred">InputSplit</A></CODE></FONT></TD>
157<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeInputSplit.html#get(int)">get</A></B>(int&nbsp;i)</CODE>
158
159<BR>
160&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Get ith child InputSplit.</TD>
161</TR>
162<TR BGCOLOR="white" CLASS="TableRowColor">
163<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
164<CODE>&nbsp;long</CODE></FONT></TD>
165<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeInputSplit.html#getLength()">getLength</A></B>()</CODE>
166
167<BR>
168&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Return the aggregate length of all child InputSplits currently added.</TD>
169</TR>
170<TR BGCOLOR="white" CLASS="TableRowColor">
171<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
172<CODE>&nbsp;long</CODE></FONT></TD>
173<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeInputSplit.html#getLength(int)">getLength</A></B>(int&nbsp;i)</CODE>
174
175<BR>
176&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Get the length of ith child InputSplit.</TD>
177</TR>
178<TR BGCOLOR="white" CLASS="TableRowColor">
179<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
180<CODE>&nbsp;<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A>[]</CODE></FONT></TD>
181<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeInputSplit.html#getLocation(int)">getLocation</A></B>(int&nbsp;i)</CODE>
182
183<BR>
184&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;getLocations from ith InputSplit.</TD>
185</TR>
186<TR BGCOLOR="white" CLASS="TableRowColor">
187<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
188<CODE>&nbsp;<A HREF="http://java.sun.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A>[]</CODE></FONT></TD>
189<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeInputSplit.html#getLocations()">getLocations</A></B>()</CODE>
190
191<BR>
192&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Collect a set of hosts from all child InputSplits.</TD>
193</TR>
194<TR BGCOLOR="white" CLASS="TableRowColor">
195<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
196<CODE>&nbsp;void</CODE></FONT></TD>
197<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeInputSplit.html#readFields(java.io.DataInput)">readFields</A></B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/io/DataInput.html?is-external=true" title="class or interface in java.io">DataInput</A>&nbsp;in)</CODE>
198
199<BR>
200&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Deserialize the fields of this object from <code>in</code>.</TD>
201</TR>
202<TR BGCOLOR="white" CLASS="TableRowColor">
203<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
204<CODE>&nbsp;void</CODE></FONT></TD>
205<TD><CODE><B><A HREF="../../../../../org/apache/hadoop/mapred/join/CompositeInputSplit.html#write(java.io.DataOutput)">write</A></B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/io/DataOutput.html?is-external=true" title="class or interface in java.io">DataOutput</A>&nbsp;out)</CODE>
206
207<BR>
208&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Write splits in the following format.</TD>
209</TR>
210</TABLE>
211&nbsp;<A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A>
212<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
213<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
214<TH ALIGN="left"><B>Methods inherited from class java.lang.<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></B></TH>
215</TR>
216<TR BGCOLOR="white" CLASS="TableRowColor">
217<TD><CODE><A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#clone()" title="class or interface in java.lang">clone</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#equals(java.lang.Object)" title="class or interface in java.lang">equals</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#finalize()" title="class or interface in java.lang">finalize</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#getClass()" title="class or interface in java.lang">getClass</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#hashCode()" title="class or interface in java.lang">hashCode</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#notify()" title="class or interface in java.lang">notify</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#notifyAll()" title="class or interface in java.lang">notifyAll</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#toString()" title="class or interface in java.lang">toString</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#wait()" title="class or interface in java.lang">wait</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#wait(long)" title="class or interface in java.lang">wait</A>, <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/Object.html?is-external=true#wait(long, int)" title="class or interface in java.lang">wait</A></CODE></TD>
218</TR>
219</TABLE>
220&nbsp;
221<P>
222
223<!-- ========= CONSTRUCTOR DETAIL ======== -->
224
225<A NAME="constructor_detail"><!-- --></A>
226<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
227<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
228<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
229<B>Constructor Detail</B></FONT></TH>
230</TR>
231</TABLE>
232
233<A NAME="CompositeInputSplit()"><!-- --></A><H3>
234CompositeInputSplit</H3>
235<PRE>
236public <B>CompositeInputSplit</B>()</PRE>
237<DL>
238</DL>
239<HR>
240
241<A NAME="CompositeInputSplit(int)"><!-- --></A><H3>
242CompositeInputSplit</H3>
243<PRE>
244public <B>CompositeInputSplit</B>(int&nbsp;capacity)</PRE>
245<DL>
246</DL>
247
248<!-- ============ METHOD DETAIL ========== -->
249
250<A NAME="method_detail"><!-- --></A>
251<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
252<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
253<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
254<B>Method Detail</B></FONT></TH>
255</TR>
256</TABLE>
257
258<A NAME="add(org.apache.hadoop.mapred.InputSplit)"><!-- --></A><H3>
259add</H3>
260<PRE>
261public void <B>add</B>(<A HREF="../../../../../org/apache/hadoop/mapred/InputSplit.html" title="interface in org.apache.hadoop.mapred">InputSplit</A>&nbsp;s)
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>
263<DL>
264<DD>Add an InputSplit to this collection.
265<P>
266<DD><DL>
267</DL>
268</DD>
269<DD><DL>
270
271<DT><B>Throws:</B>
272<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> - If capacity was not specified during construction
273                     or if capacity has been reached.</DL>
274</DD>
275</DL>
276<HR>
277
278<A NAME="get(int)"><!-- --></A><H3>
279get</H3>
280<PRE>
281public <A HREF="../../../../../org/apache/hadoop/mapred/InputSplit.html" title="interface in org.apache.hadoop.mapred">InputSplit</A> <B>get</B>(int&nbsp;i)</PRE>
282<DL>
283<DD>Get ith child InputSplit.
284<P>
285<DD><DL>
286</DL>
287</DD>
288<DD><DL>
289</DL>
290</DD>
291</DL>
292<HR>
293
294<A NAME="getLength()"><!-- --></A><H3>
295getLength</H3>
296<PRE>
297public long <B>getLength</B>()
298               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>
299<DL>
300<DD>Return the aggregate length of all child InputSplits currently added.
301<P>
302<DD><DL>
303<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../org/apache/hadoop/mapred/InputSplit.html#getLength()">getLength</A></CODE> in interface <CODE><A HREF="../../../../../org/apache/hadoop/mapred/InputSplit.html" title="interface in org.apache.hadoop.mapred">InputSplit</A></CODE></DL>
304</DD>
305<DD><DL>
306
307<DT><B>Returns:</B><DD>the number of bytes in the input split.
308<DT><B>Throws:</B>
309<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>
310</DD>
311</DL>
312<HR>
313
314<A NAME="getLength(int)"><!-- --></A><H3>
315getLength</H3>
316<PRE>
317public long <B>getLength</B>(int&nbsp;i)
318               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>
319<DL>
320<DD>Get the length of ith child InputSplit.
321<P>
322<DD><DL>
323</DL>
324</DD>
325<DD><DL>
326
327<DT><B>Throws:</B>
328<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>
329</DD>
330</DL>
331<HR>
332
333<A NAME="getLocations()"><!-- --></A><H3>
334getLocations</H3>
335<PRE>
336public <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A>[] <B>getLocations</B>()
337                      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>
338<DL>
339<DD>Collect a set of hosts from all child InputSplits.
340<P>
341<DD><DL>
342<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../org/apache/hadoop/mapred/InputSplit.html#getLocations()">getLocations</A></CODE> in interface <CODE><A HREF="../../../../../org/apache/hadoop/mapred/InputSplit.html" title="interface in org.apache.hadoop.mapred">InputSplit</A></CODE></DL>
343</DD>
344<DD><DL>
345
346<DT><B>Returns:</B><DD>list of hostnames where data of the <code>InputSplit</code> is
347         located as an array of <code>String</code>s.
348<DT><B>Throws:</B>
349<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>
350</DD>
351</DL>
352<HR>
353
354<A NAME="getLocation(int)"><!-- --></A><H3>
355getLocation</H3>
356<PRE>
357public <A HREF="http://java.sun.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A>[] <B>getLocation</B>(int&nbsp;i)
358                     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>
359<DL>
360<DD>getLocations from ith InputSplit.
361<P>
362<DD><DL>
363</DL>
364</DD>
365<DD><DL>
366
367<DT><B>Throws:</B>
368<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>
369</DD>
370</DL>
371<HR>
372
373<A NAME="write(java.io.DataOutput)"><!-- --></A><H3>
374write</H3>
375<PRE>
376public void <B>write</B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/io/DataOutput.html?is-external=true" title="class or interface in java.io">DataOutput</A>&nbsp;out)
377           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>
378<DL>
379<DD>Write splits in the following format.
380 <code>&lt;count&gt;&lt;class1&gt;&lt;class2&gt;...&lt;classn&gt;&lt;split1&gt;&lt;split2&gt;...&lt;splitn&gt;
381 </code>
382<P>
383<DD><DL>
384<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../org/apache/hadoop/io/Writable.html#write(java.io.DataOutput)">write</A></CODE> in interface <CODE><A HREF="../../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</A></CODE></DL>
385</DD>
386<DD><DL>
387<DT><B>Parameters:</B><DD><CODE>out</CODE> - <code>DataOuput</code> to serialize this object into.
388<DT><B>Throws:</B>
389<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>
390</DD>
391</DL>
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393
394<A NAME="readFields(java.io.DataInput)"><!-- --></A><H3>
395readFields</H3>
396<PRE>
397public void <B>readFields</B>(<A HREF="http://java.sun.com/javase/6/docs/api/java/io/DataInput.html?is-external=true" title="class or interface in java.io">DataInput</A>&nbsp;in)
398                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>
399<DL>
400<DD>Deserialize the fields of this object from <code>in</code>. 
401 
402 <p>For efficiency, implementations should attempt to re-use storage in the
403 existing object where possible.</p>
404<P>
405<DD><DL>
406<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../org/apache/hadoop/io/Writable.html#readFields(java.io.DataInput)">readFields</A></CODE> in interface <CODE><A HREF="../../../../../org/apache/hadoop/io/Writable.html" title="interface in org.apache.hadoop.io">Writable</A></CODE></DL>
407</DD>
408<DD><DL>
409<DT><B>Parameters:</B><DD><CODE>in</CODE> - <code>DataInput</code> to deseriablize this object from.
410<DT><B>Throws:</B>
411<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> - If the child InputSplit cannot be read, typically
412                     for faliing access checks.</DL>
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