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<h2 title="Class NarrowDependency" class="title">Class NarrowDependency&lt;T&gt;</h2>
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<pre>public abstract class <span class="strong">NarrowDependency&lt;T&gt;</span>
extends <a href="../../../org/apache/spark/Dependency.html" title="class in org.apache.spark">Dependency</a>&lt;T&gt;</pre>
<div class="block">:: DeveloperApi ::
 Base class for dependencies where each partition of the child RDD depends on a small number
 of partitions of the parent RDD. Narrow dependencies allow for pipelined execution.</div>
<dl><dt><span class="strong">See Also:</span></dt><dd><a href="../../../serialized-form.html#org.apache.spark.NarrowDependency">Serialized Form</a></dd></dl>
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<td class="colOne"><code><strong><a href="../../../org/apache/spark/NarrowDependency.html#NarrowDependency(org.apache.spark.rdd.RDD)">NarrowDependency</a></strong>(<a href="../../../org/apache/spark/rdd/RDD.html" title="class in org.apache.spark.rdd">RDD</a>&lt;<a href="../../../org/apache/spark/NarrowDependency.html" title="type parameter in NarrowDependency">T</a>&gt;&nbsp;_rdd)</code>&nbsp;</td>
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<td class="colFirst"><code>abstract scala.collection.Seq&lt;java.lang.Object&gt;</code></td>
<td class="colLast"><code><strong><a href="../../../org/apache/spark/NarrowDependency.html#getParents(int)">getParents</a></strong>(int&nbsp;partitionId)</code>
<div class="block">Get the parent partitions for a child partition.</div>
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<td class="colFirst"><code><a href="../../../org/apache/spark/rdd/RDD.html" title="class in org.apache.spark.rdd">RDD</a>&lt;<a href="../../../org/apache/spark/NarrowDependency.html" title="type parameter in NarrowDependency">T</a>&gt;</code></td>
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<h4>NarrowDependency</h4>
<pre>public&nbsp;NarrowDependency(<a href="../../../org/apache/spark/rdd/RDD.html" title="class in org.apache.spark.rdd">RDD</a>&lt;<a href="../../../org/apache/spark/NarrowDependency.html" title="type parameter in NarrowDependency">T</a>&gt;&nbsp;_rdd)</pre>
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<pre>public abstract&nbsp;scala.collection.Seq&lt;java.lang.Object&gt;&nbsp;getParents(int&nbsp;partitionId)</pre>
<div class="block">Get the parent partitions for a child partition.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>partitionId</code> - a partition of the child RDD</dd>
<dt><span class="strong">Returns:</span></dt><dd>the partitions of the parent RDD that the child partition depends upon</dd></dl>
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<h4>rdd</h4>
<pre>public&nbsp;<a href="../../../org/apache/spark/rdd/RDD.html" title="class in org.apache.spark.rdd">RDD</a>&lt;<a href="../../../org/apache/spark/NarrowDependency.html" title="type parameter in NarrowDependency">T</a>&gt;&nbsp;rdd()</pre>
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