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7Uses of Interface org.apache.hadoop.mapred.join.ResetableIterator (Hadoop 0.20.1 API)
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84<B>Uses of Interface<br>org.apache.hadoop.mapred.join.ResetableIterator</B></H2>
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90Packages that use <A HREF="../../../../../../org/apache/hadoop/mapred/join/ResetableIterator.html" title="interface in org.apache.hadoop.mapred.join">ResetableIterator</A></FONT></TH>
91</TR>
92<TR BGCOLOR="white" CLASS="TableRowColor">
93<TD><A HREF="#org.apache.hadoop.mapred.join"><B>org.apache.hadoop.mapred.join</B></A></TD>
94<TD>Given a set of sorted datasets keyed with the same class and yielding equal
95partitions, it is possible to effect a join of those datasets prior to the map.&nbsp;</TD>
96</TR>
97</TABLE>
98&nbsp;
99<P>
100<A NAME="org.apache.hadoop.mapred.join"><!-- --></A>
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103<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
104Uses of <A HREF="../../../../../../org/apache/hadoop/mapred/join/ResetableIterator.html" title="interface in org.apache.hadoop.mapred.join">ResetableIterator</A> in <A HREF="../../../../../../org/apache/hadoop/mapred/join/package-summary.html">org.apache.hadoop.mapred.join</A></FONT></TH>
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107&nbsp;
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109
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111<TR BGCOLOR="#CCCCFF" CLASS="TableSubHeadingColor">
112<TH ALIGN="left" COLSPAN="2">Classes in <A HREF="../../../../../../org/apache/hadoop/mapred/join/package-summary.html">org.apache.hadoop.mapred.join</A> that implement <A HREF="../../../../../../org/apache/hadoop/mapred/join/ResetableIterator.html" title="interface in org.apache.hadoop.mapred.join">ResetableIterator</A></FONT></TH>
113</TR>
114<TR BGCOLOR="white" CLASS="TableRowColor">
115<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
116<CODE>&nbsp;class</CODE></FONT></TD>
117<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapred/join/ArrayListBackedIterator.html" title="class in org.apache.hadoop.mapred.join">ArrayListBackedIterator&lt;X extends Writable&gt;</A></B></CODE>
118
119<BR>
120&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;This class provides an implementation of ResetableIterator.</TD>
121</TR>
122<TR BGCOLOR="white" CLASS="TableRowColor">
123<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
124<CODE>protected &nbsp;class</CODE></FONT></TD>
125<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapred/join/JoinRecordReader.JoinDelegationIterator.html" title="class in org.apache.hadoop.mapred.join">JoinRecordReader.JoinDelegationIterator</A></B></CODE>
126
127<BR>
128&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Since the JoinCollector is effecting our operation, we need only
129 provide an iterator proxy wrapping its operation.</TD>
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132<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
133<CODE>protected &nbsp;class</CODE></FONT></TD>
134<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapred/join/MultiFilterRecordReader.MultiFilterDelegationIterator.html" title="class in org.apache.hadoop.mapred.join">MultiFilterRecordReader.MultiFilterDelegationIterator</A></B></CODE>
135
136<BR>
137&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Proxy the JoinCollector, but include callback to emit.</TD>
138</TR>
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140<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
141<CODE>static&nbsp;class</CODE></FONT></TD>
142<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapred/join/ResetableIterator.EMPTY.html" title="class in org.apache.hadoop.mapred.join">ResetableIterator.EMPTY&lt;U extends Writable&gt;</A></B></CODE>
143
144<BR>
145&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
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149<CODE>&nbsp;class</CODE></FONT></TD>
150<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapred/join/StreamBackedIterator.html" title="class in org.apache.hadoop.mapred.join">StreamBackedIterator&lt;X extends Writable&gt;</A></B></CODE>
151
152<BR>
153&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;This class provides an implementation of ResetableIterator.</TD>
154</TR>
155</TABLE>
156&nbsp;
157<P>
158
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161<TH ALIGN="left" COLSPAN="2">Methods in <A HREF="../../../../../../org/apache/hadoop/mapred/join/package-summary.html">org.apache.hadoop.mapred.join</A> that return <A HREF="../../../../../../org/apache/hadoop/mapred/join/ResetableIterator.html" title="interface in org.apache.hadoop.mapred.join">ResetableIterator</A></FONT></TH>
162</TR>
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164<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
165<CODE>protected &nbsp;<A HREF="../../../../../../org/apache/hadoop/mapred/join/ResetableIterator.html" title="interface in org.apache.hadoop.mapred.join">ResetableIterator</A>&lt;<A HREF="../../../../../../org/apache/hadoop/mapred/join/MultiFilterRecordReader.html" title="type parameter in MultiFilterRecordReader">V</A>&gt;</CODE></FONT></TD>
166<TD><CODE><B>MultiFilterRecordReader.</B><B><A HREF="../../../../../../org/apache/hadoop/mapred/join/MultiFilterRecordReader.html#getDelegate()">getDelegate</A></B>()</CODE>
167
168<BR>
169&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Return an iterator returning a single value from the tuple.</TD>
170</TR>
171<TR BGCOLOR="white" CLASS="TableRowColor">
172<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
173<CODE>protected &nbsp;<A HREF="../../../../../../org/apache/hadoop/mapred/join/ResetableIterator.html" title="interface in org.apache.hadoop.mapred.join">ResetableIterator</A>&lt;<A HREF="../../../../../../org/apache/hadoop/mapred/join/TupleWritable.html" title="class in org.apache.hadoop.mapred.join">TupleWritable</A>&gt;</CODE></FONT></TD>
174<TD><CODE><B>JoinRecordReader.</B><B><A HREF="../../../../../../org/apache/hadoop/mapred/join/JoinRecordReader.html#getDelegate()">getDelegate</A></B>()</CODE>
175
176<BR>
177&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Return an iterator wrapping the JoinCollector.</TD>
178</TR>
179<TR BGCOLOR="white" CLASS="TableRowColor">
180<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
181<CODE>protected abstract &nbsp;<A HREF="../../../../../../org/apache/hadoop/mapred/join/ResetableIterator.html" title="interface in org.apache.hadoop.mapred.join">ResetableIterator</A>&lt;<A HREF="../../../../../../org/apache/hadoop/mapred/join/CompositeRecordReader.html" title="type parameter in CompositeRecordReader">X</A>&gt;</CODE></FONT></TD>
182<TD><CODE><B>CompositeRecordReader.</B><B><A HREF="../../../../../../org/apache/hadoop/mapred/join/CompositeRecordReader.html#getDelegate()">getDelegate</A></B>()</CODE>
183
184<BR>
185&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Obtain an iterator over the child RRs apropos of the value type
186 ultimately emitted from this join.</TD>
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