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ValueAggregatorJob (Apache Hadoop Main 2.0.0-alpha API)
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org.apache.hadoop.mapred.lib.aggregate</FONT>
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Class ValueAggregatorJob</H2>
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<A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</A>
  <IMG SRC="../../../../../../resources/inherit.gif" ALT="extended by "><B>org.apache.hadoop.mapred.lib.aggregate.ValueAggregatorJob</B>
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<DT><PRE><FONT SIZE="-1">@InterfaceAudience.Public
@InterfaceStability.Stable
</FONT>public class <A HREF="../../../../../../src-html/org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorJob.html#line.84"><B>ValueAggregatorJob</B></A><DT>extends <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A></DL>
</PRE>

<P>
This is the main class for creating a map/reduce job using Aggregate
 framework. The Aggregate is a specialization of map/reduce framework,
 specilizing for performing various simple aggregations.
 
 Generally speaking, in order to implement an application using Map/Reduce
 model, the developer is to implement Map and Reduce functions (and possibly
 combine function). However, a lot of applications related to counting and
 statistics computing have very similar characteristics. Aggregate abstracts
 out the general patterns of these functions and implementing those patterns.
 In particular, the package provides generic mapper/redducer/combiner classes,
 and a set of built-in value aggregators, and a generic utility class that
 helps user create map/reduce jobs using the generic class. The built-in
 aggregators include:
 
 sum over numeric values count the number of distinct values compute the
 histogram of values compute the minimum, maximum, media,average, standard
 deviation of numeric values
 
 The developer using Aggregate will need only to provide a plugin class
 conforming to the following interface:
 
 public interface ValueAggregatorDescriptor { public ArrayList<Entry>
 generateKeyValPairs(Object key, Object value); public void
 configure(JobConfjob); }
 
 The package also provides a base class, ValueAggregatorBaseDescriptor,
 implementing the above interface. The user can extend the base class and
 implement generateKeyValPairs accordingly.
 
 The primary work of generateKeyValPairs is to emit one or more key/value
 pairs based on the input key/value pair. The key in an output key/value pair
 encode two pieces of information: aggregation type and aggregation id. The
 value will be aggregated onto the aggregation id according the aggregation
 type.
 
 This class offers a function to generate a map/reduce job using Aggregate
 framework. The function takes the following parameters: input directory spec
 input format (text or sequence file) output directory a file specifying the
 user plugin class
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<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorJob.html#ValueAggregatorJob()">ValueAggregatorJob</A></B>()</CODE>

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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static&nbsp;<A HREF="../../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorJob.html#createValueAggregatorJob(java.lang.String[])">createValueAggregatorJob</A></B>(<A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A>[]&nbsp;args)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Create an Aggregate based map/reduce job.</TD>
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<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static&nbsp;<A HREF="../../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorJob.html#createValueAggregatorJob(java.lang.String[], java.lang.Class[])">createValueAggregatorJob</A></B>(<A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A>[]&nbsp;args,
                                                 <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</A>&lt;? extends <A HREF="../../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorDescriptor.html" title="interface in org.apache.hadoop.mapred.lib.aggregate">ValueAggregatorDescriptor</A>&gt;[]&nbsp;descriptors)</CODE>

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<CODE>static&nbsp;<A HREF="../../../../../../org/apache/hadoop/mapred/jobcontrol/JobControl.html" title="class in org.apache.hadoop.mapred.jobcontrol">JobControl</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorJob.html#createValueAggregatorJobs(java.lang.String[])">createValueAggregatorJobs</A></B>(<A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A>[]&nbsp;args)</CODE>

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<CODE>static&nbsp;<A HREF="../../../../../../org/apache/hadoop/mapred/jobcontrol/JobControl.html" title="class in org.apache.hadoop.mapred.jobcontrol">JobControl</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorJob.html#createValueAggregatorJobs(java.lang.String[], java.lang.Class[])">createValueAggregatorJobs</A></B>(<A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A>[]&nbsp;args,
                                                   <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</A>&lt;? extends <A HREF="../../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorDescriptor.html" title="interface in org.apache.hadoop.mapred.lib.aggregate">ValueAggregatorDescriptor</A>&gt;[]&nbsp;descriptors)</CODE>

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<CODE>static&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorJob.html#main(java.lang.String[])">main</A></B>(<A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A>[]&nbsp;args)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;create and run an Aggregate based map/reduce job.</TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static&nbsp;void</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorJob.html#setAggregatorDescriptors(org.apache.hadoop.mapred.JobConf, java.lang.Class[])">setAggregatorDescriptors</A></B>(<A HREF="../../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A>&nbsp;job,
                                                 <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</A>&lt;? extends <A HREF="../../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorDescriptor.html" title="interface in org.apache.hadoop.mapred.lib.aggregate">ValueAggregatorDescriptor</A>&gt;[]&nbsp;descriptors)</CODE>

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<A NAME="ValueAggregatorJob()"><!-- --></A><H3>
ValueAggregatorJob</H3>
<PRE>
public <A HREF="../../../../../../src-html/org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorJob.html#line.84"><B>ValueAggregatorJob</B></A>()</PRE>
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<A NAME="createValueAggregatorJobs(java.lang.String[], java.lang.Class[])"><!-- --></A><H3>
createValueAggregatorJobs</H3>
<PRE>
public static <A HREF="../../../../../../org/apache/hadoop/mapred/jobcontrol/JobControl.html" title="class in org.apache.hadoop.mapred.jobcontrol">JobControl</A> <A HREF="../../../../../../src-html/org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorJob.html#line.86"><B>createValueAggregatorJobs</B></A>(<A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A>[]&nbsp;args,
                                                   <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</A>&lt;? extends <A HREF="../../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorDescriptor.html" title="interface in org.apache.hadoop.mapred.lib.aggregate">ValueAggregatorDescriptor</A>&gt;[]&nbsp;descriptors)
                                            throws <A HREF="http://download.oracle.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</A></PRE>
<DL>
<DD><DL>

<DT><B>Throws:</B>
<DD><CODE><A HREF="http://download.oracle.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</A></CODE></DL>
</DD>
</DL>
<HR>

<A NAME="createValueAggregatorJobs(java.lang.String[])"><!-- --></A><H3>
createValueAggregatorJobs</H3>
<PRE>
public static <A HREF="../../../../../../org/apache/hadoop/mapred/jobcontrol/JobControl.html" title="class in org.apache.hadoop.mapred.jobcontrol">JobControl</A> <A HREF="../../../../../../src-html/org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorJob.html#line.99"><B>createValueAggregatorJobs</B></A>(<A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A>[]&nbsp;args)
                                            throws <A HREF="http://download.oracle.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</A></PRE>
<DL>
<DD><DL>

<DT><B>Throws:</B>
<DD><CODE><A HREF="http://download.oracle.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</A></CODE></DL>
</DD>
</DL>
<HR>

<A NAME="createValueAggregatorJob(java.lang.String[])"><!-- --></A><H3>
createValueAggregatorJob</H3>
<PRE>
public static <A HREF="../../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A> <A HREF="../../../../../../src-html/org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorJob.html#line.113"><B>createValueAggregatorJob</B></A>(<A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A>[]&nbsp;args)
                                        throws <A HREF="http://download.oracle.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</A></PRE>
<DL>
<DD>Create an Aggregate based map/reduce job.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>args</CODE> - the arguments used for job creation. Generic hadoop
 arguments are accepted.
<DT><B>Returns:</B><DD>a JobConf object ready for submission.
<DT><B>Throws:</B>
<DD><CODE><A HREF="http://download.oracle.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</A></CODE><DT><B>See Also:</B><DD><CODE>GenericOptionsParser</CODE></DL>
</DD>
</DL>
<HR>

<A NAME="createValueAggregatorJob(java.lang.String[], java.lang.Class[])"><!-- --></A><H3>
createValueAggregatorJob</H3>
<PRE>
public static <A HREF="../../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A> <A HREF="../../../../../../src-html/org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorJob.html#line.186"><B>createValueAggregatorJob</B></A>(<A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A>[]&nbsp;args,
                                               <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</A>&lt;? extends <A HREF="../../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorDescriptor.html" title="interface in org.apache.hadoop.mapred.lib.aggregate">ValueAggregatorDescriptor</A>&gt;[]&nbsp;descriptors)
                                        throws <A HREF="http://download.oracle.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</A></PRE>
<DL>
<DD><DL>

<DT><B>Throws:</B>
<DD><CODE><A HREF="http://download.oracle.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</A></CODE></DL>
</DD>
</DL>
<HR>

<A NAME="setAggregatorDescriptors(org.apache.hadoop.mapred.JobConf, java.lang.Class[])"><!-- --></A><H3>
setAggregatorDescriptors</H3>
<PRE>
public static void <A HREF="../../../../../../src-html/org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorJob.html#line.194"><B>setAggregatorDescriptors</B></A>(<A HREF="../../../../../../org/apache/hadoop/mapred/JobConf.html" title="class in org.apache.hadoop.mapred">JobConf</A>&nbsp;job,
                                            <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Class.html?is-external=true" title="class or interface in java.lang">Class</A>&lt;? extends <A HREF="../../../../../../org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorDescriptor.html" title="interface in org.apache.hadoop.mapred.lib.aggregate">ValueAggregatorDescriptor</A>&gt;[]&nbsp;descriptors)</PRE>
<DL>
<DD><DL>
</DL>
</DD>
</DL>
<HR>

<A NAME="main(java.lang.String[])"><!-- --></A><H3>
main</H3>
<PRE>
public static void <A HREF="../../../../../../src-html/org/apache/hadoop/mapred/lib/aggregate/ValueAggregatorJob.html#line.209"><B>main</B></A>(<A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</A>[]&nbsp;args)
                 throws <A HREF="http://download.oracle.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</A></PRE>
<DL>
<DD>create and run an Aggregate based map/reduce job.
<P>
<DD><DL>
<DT><B>Parameters:</B><DD><CODE>args</CODE> - the arguments used for job creation
<DT><B>Throws:</B>
<DD><CODE><A HREF="http://download.oracle.com/javase/6/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</A></CODE></DL>
</DD>
</DL>
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