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<div class="subTitle">org.apache.spark</div>
<h2 title="Class Aggregator" class="title">Class Aggregator<K,V,C></h2>
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<li>java.lang.Object</li>
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<li>org.apache.spark.Aggregator<K,V,C></li>
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<pre>public class <span class="strong">Aggregator<K,V,C></span>
extends java.lang.Object
implements scala.Product, scala.Serializable</pre>
<div class="block">:: DeveloperApi ::
A set of functions used to aggregate data.
<p>
param: createCombiner function to create the initial value of the aggregation.
param: mergeValue function to merge a new value into the aggregation result.
param: mergeCombiners function to merge outputs from multiple mergeValue function.</div>
<dl><dt><span class="strong">See Also:</span></dt><dd><a href="../../../serialized-form.html#org.apache.spark.Aggregator">Serialized Form</a></dd></dl>
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<th class="colOne" scope="col">Constructor and Description</th>
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<td class="colOne"><code><strong><a href="../../../org/apache/spark/Aggregator.html#Aggregator(scala.Function1, scala.Function2, scala.Function2)">Aggregator</a></strong>(scala.Function1<<a href="../../../org/apache/spark/Aggregator.html" title="type parameter in Aggregator">V</a>,<a href="../../../org/apache/spark/Aggregator.html" title="type parameter in Aggregator">C</a>> createCombiner,
scala.Function2<<a href="../../../org/apache/spark/Aggregator.html" title="type parameter in Aggregator">C</a>,<a href="../../../org/apache/spark/Aggregator.html" title="type parameter in Aggregator">V</a>,<a href="../../../org/apache/spark/Aggregator.html" title="type parameter in Aggregator">C</a>> mergeValue,
scala.Function2<<a href="../../../org/apache/spark/Aggregator.html" title="type parameter in Aggregator">C</a>,<a href="../../../org/apache/spark/Aggregator.html" title="type parameter in Aggregator">C</a>,<a href="../../../org/apache/spark/Aggregator.html" title="type parameter in Aggregator">C</a>> mergeCombiners)</code> </td>
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<h3>Method Summary</h3>
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<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Method and Description</th>
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<td class="colFirst"><code>scala.collection.Iterator<scala.Tuple2<<a href="../../../org/apache/spark/Aggregator.html" title="type parameter in Aggregator">K</a>,<a href="../../../org/apache/spark/Aggregator.html" title="type parameter in Aggregator">C</a>>></code></td>
<td class="colLast"><code><strong><a href="../../../org/apache/spark/Aggregator.html#combineCombinersByKey(scala.collection.Iterator)">combineCombinersByKey</a></strong>(scala.collection.Iterator<scala.Product2<<a href="../../../org/apache/spark/Aggregator.html" title="type parameter in Aggregator">K</a>,<a href="../../../org/apache/spark/Aggregator.html" title="type parameter in Aggregator">C</a>>> iter)</code> </td>
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<td class="colFirst"><code>scala.collection.Iterator<scala.Tuple2<<a href="../../../org/apache/spark/Aggregator.html" title="type parameter in Aggregator">K</a>,<a href="../../../org/apache/spark/Aggregator.html" title="type parameter in Aggregator">C</a>>></code></td>
<td class="colLast"><code><strong><a href="../../../org/apache/spark/Aggregator.html#combineCombinersByKey(scala.collection.Iterator, org.apache.spark.TaskContext)">combineCombinersByKey</a></strong>(scala.collection.Iterator<scala.Product2<<a href="../../../org/apache/spark/Aggregator.html" title="type parameter in Aggregator">K</a>,<a href="../../../org/apache/spark/Aggregator.html" title="type parameter in Aggregator">C</a>>> iter,
<a href="../../../org/apache/spark/TaskContext.html" title="class in org.apache.spark">TaskContext</a> context)</code> </td>
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<td class="colFirst"><code>scala.collection.Iterator<scala.Tuple2<<a href="../../../org/apache/spark/Aggregator.html" title="type parameter in Aggregator">K</a>,<a href="../../../org/apache/spark/Aggregator.html" title="type parameter in Aggregator">C</a>>></code></td>
<td class="colLast"><code><strong><a href="../../../org/apache/spark/Aggregator.html#combineValuesByKey(scala.collection.Iterator)">combineValuesByKey</a></strong>(scala.collection.Iterator<scala.Product2<<a href="../../../org/apache/spark/Aggregator.html" title="type parameter in Aggregator">K</a>,<a href="../../../org/apache/spark/Aggregator.html" title="type parameter in Aggregator">V</a>>> iter)</code> </td>
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<td class="colFirst"><code>scala.collection.Iterator<scala.Tuple2<<a href="../../../org/apache/spark/Aggregator.html" title="type parameter in Aggregator">K</a>,<a href="../../../org/apache/spark/Aggregator.html" title="type parameter in Aggregator">C</a>>></code></td>
<td class="colLast"><code><strong><a href="../../../org/apache/spark/Aggregator.html#combineValuesByKey(scala.collection.Iterator, org.apache.spark.TaskContext)">combineValuesByKey</a></strong>(scala.collection.Iterator<scala.Product2<<a href="../../../org/apache/spark/Aggregator.html" title="type parameter in Aggregator">K</a>,<a href="../../../org/apache/spark/Aggregator.html" title="type parameter in Aggregator">V</a>>> iter,
<a href="../../../org/apache/spark/TaskContext.html" title="class in org.apache.spark">TaskContext</a> context)</code> </td>
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<tr class="altColor">
<td class="colFirst"><code>scala.Function1<<a href="../../../org/apache/spark/Aggregator.html" title="type parameter in Aggregator">V</a>,<a href="../../../org/apache/spark/Aggregator.html" title="type parameter in Aggregator">C</a>></code></td>
<td class="colLast"><code><strong><a href="../../../org/apache/spark/Aggregator.html#createCombiner()">createCombiner</a></strong>()</code> </td>
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<td class="colFirst"><code>scala.Function2<<a href="../../../org/apache/spark/Aggregator.html" title="type parameter in Aggregator">C</a>,<a href="../../../org/apache/spark/Aggregator.html" title="type parameter in Aggregator">C</a>,<a href="../../../org/apache/spark/Aggregator.html" title="type parameter in Aggregator">C</a>></code></td>
<td class="colLast"><code><strong><a href="../../../org/apache/spark/Aggregator.html#mergeCombiners()">mergeCombiners</a></strong>()</code> </td>
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<tr class="altColor">
<td class="colFirst"><code>scala.Function2<<a href="../../../org/apache/spark/Aggregator.html" title="type parameter in Aggregator">C</a>,<a href="../../../org/apache/spark/Aggregator.html" title="type parameter in Aggregator">V</a>,<a href="../../../org/apache/spark/Aggregator.html" title="type parameter in Aggregator">C</a>></code></td>
<td class="colLast"><code><strong><a href="../../../org/apache/spark/Aggregator.html#mergeValue()">mergeValue</a></strong>()</code> </td>
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<h3>Methods inherited from class java.lang.Object</h3>
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<h3>Methods inherited from interface scala.Product</h3>
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<h3>Methods inherited from interface scala.Equals</h3>
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<h4>Aggregator</h4>
<pre>public Aggregator(scala.Function1<<a href="../../../org/apache/spark/Aggregator.html" title="type parameter in Aggregator">V</a>,<a href="../../../org/apache/spark/Aggregator.html" title="type parameter in Aggregator">C</a>> createCombiner,
scala.Function2<<a href="../../../org/apache/spark/Aggregator.html" title="type parameter in Aggregator">C</a>,<a href="../../../org/apache/spark/Aggregator.html" title="type parameter in Aggregator">V</a>,<a href="../../../org/apache/spark/Aggregator.html" title="type parameter in Aggregator">C</a>> mergeValue,
scala.Function2<<a href="../../../org/apache/spark/Aggregator.html" title="type parameter in Aggregator">C</a>,<a href="../../../org/apache/spark/Aggregator.html" title="type parameter in Aggregator">C</a>,<a href="../../../org/apache/spark/Aggregator.html" title="type parameter in Aggregator">C</a>> mergeCombiners)</pre>
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<h4>createCombiner</h4>
<pre>public scala.Function1<<a href="../../../org/apache/spark/Aggregator.html" title="type parameter in Aggregator">V</a>,<a href="../../../org/apache/spark/Aggregator.html" title="type parameter in Aggregator">C</a>> createCombiner()</pre>
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<h4>mergeValue</h4>
<pre>public scala.Function2<<a href="../../../org/apache/spark/Aggregator.html" title="type parameter in Aggregator">C</a>,<a href="../../../org/apache/spark/Aggregator.html" title="type parameter in Aggregator">V</a>,<a href="../../../org/apache/spark/Aggregator.html" title="type parameter in Aggregator">C</a>> mergeValue()</pre>
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<h4>mergeCombiners</h4>
<pre>public scala.Function2<<a href="../../../org/apache/spark/Aggregator.html" title="type parameter in Aggregator">C</a>,<a href="../../../org/apache/spark/Aggregator.html" title="type parameter in Aggregator">C</a>,<a href="../../../org/apache/spark/Aggregator.html" title="type parameter in Aggregator">C</a>> mergeCombiners()</pre>
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<h4>combineValuesByKey</h4>
<pre>public scala.collection.Iterator<scala.Tuple2<<a href="../../../org/apache/spark/Aggregator.html" title="type parameter in Aggregator">K</a>,<a href="../../../org/apache/spark/Aggregator.html" title="type parameter in Aggregator">C</a>>> combineValuesByKey(scala.collection.Iterator<scala.Product2<<a href="../../../org/apache/spark/Aggregator.html" title="type parameter in Aggregator">K</a>,<a href="../../../org/apache/spark/Aggregator.html" title="type parameter in Aggregator">V</a>>> iter)</pre>
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<pre>public scala.collection.Iterator<scala.Tuple2<<a href="../../../org/apache/spark/Aggregator.html" title="type parameter in Aggregator">K</a>,<a href="../../../org/apache/spark/Aggregator.html" title="type parameter in Aggregator">C</a>>> combineValuesByKey(scala.collection.Iterator<scala.Product2<<a href="../../../org/apache/spark/Aggregator.html" title="type parameter in Aggregator">K</a>,<a href="../../../org/apache/spark/Aggregator.html" title="type parameter in Aggregator">V</a>>> iter,
<a href="../../../org/apache/spark/TaskContext.html" title="class in org.apache.spark">TaskContext</a> context)</pre>
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<h4>combineCombinersByKey</h4>
<pre>public scala.collection.Iterator<scala.Tuple2<<a href="../../../org/apache/spark/Aggregator.html" title="type parameter in Aggregator">K</a>,<a href="../../../org/apache/spark/Aggregator.html" title="type parameter in Aggregator">C</a>>> combineCombinersByKey(scala.collection.Iterator<scala.Product2<<a href="../../../org/apache/spark/Aggregator.html" title="type parameter in Aggregator">K</a>,<a href="../../../org/apache/spark/Aggregator.html" title="type parameter in Aggregator">C</a>>> iter)</pre>
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<pre>public scala.collection.Iterator<scala.Tuple2<<a href="../../../org/apache/spark/Aggregator.html" title="type parameter in Aggregator">K</a>,<a href="../../../org/apache/spark/Aggregator.html" title="type parameter in Aggregator">C</a>>> combineCombinersByKey(scala.collection.Iterator<scala.Product2<<a href="../../../org/apache/spark/Aggregator.html" title="type parameter in Aggregator">K</a>,<a href="../../../org/apache/spark/Aggregator.html" title="type parameter in Aggregator">C</a>>> iter,
<a href="../../../org/apache/spark/TaskContext.html" title="class in org.apache.spark">TaskContext</a> context)</pre>
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