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<div class="subTitle">org.apache.beam.sdk.transforms</div>
<h2 title="Class Partition" class="title">Class Partition&lt;T&gt;</h2>
</div>
<div class="contentContainer">
<ul class="inheritance">
<li>java.lang.Object</li>
<li>
<ul class="inheritance">
<li><a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html" title="class in org.apache.beam.sdk.transforms">org.apache.beam.sdk.transforms.PTransform</a>&lt;<a href="../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values">PCollection</a>&lt;T&gt;,<a href="../../../../../org/apache/beam/sdk/values/PCollectionList.html" title="class in org.apache.beam.sdk.values">PCollectionList</a>&lt;T&gt;&gt;</li>
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<li>org.apache.beam.sdk.transforms.Partition&lt;T&gt;</li>
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<dt><span class="paramLabel">Type Parameters:</span></dt>
<dd><code>T</code> - the type of the elements of the input and output <code>PCollection</code>s</dd>
</dl>
<dl>
<dt>All Implemented Interfaces:</dt>
<dd>java.io.Serializable, <a href="../../../../../org/apache/beam/sdk/transforms/display/HasDisplayData.html" title="interface in org.apache.beam.sdk.transforms.display">HasDisplayData</a></dd>
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<pre>public class <span class="typeNameLabel">Partition&lt;T&gt;</span>
extends <a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html" title="class in org.apache.beam.sdk.transforms">PTransform</a>&lt;<a href="../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values">PCollection</a>&lt;T&gt;,<a href="../../../../../org/apache/beam/sdk/values/PCollectionList.html" title="class in org.apache.beam.sdk.values">PCollectionList</a>&lt;T&gt;&gt;</pre>
<div class="block"><code>Partition</code> takes a <code>PCollection&lt;T&gt;</code> and a <code>PartitionFn</code>, uses the <code>PartitionFn</code> to split the elements of the input <code>PCollection</code> into <code>N</code> partitions,
and returns a <code>PCollectionList&lt;T&gt;</code> that bundles <code>N</code> <code>PCollection&lt;T&gt;</code>s
containing the split elements.
<p>Example of use:
<pre><code>
PCollection&lt;Student&gt; students = ...;
// Split students up into 10 partitions, by percentile:
PCollectionList&lt;Student&gt; studentsByPercentile =
students.apply(Partition.of(10, new PartitionFn&lt;Student&gt;() {
public int partitionFor(Student student, int numPartitions) {
return student.getPercentile() // 0..99
* numPartitions / 100;
}}))
for (int i = 0; i &lt; 10; i++) {
PCollection&lt;Student&gt; partition = studentsByPercentile.get(i);
...
}
</code></pre>
<p>By default, the <code>Coder</code> of each of the <code>PCollection</code>s in the output <code>PCollectionList</code> is the same as the <code>Coder</code> of the input <code>PCollection</code>.
<p>Each output element has the same timestamp and is in the same windows as its corresponding
input element, and each output <code>PCollection</code> has the same <a href="../../../../../org/apache/beam/sdk/transforms/windowing/WindowFn.html" title="class in org.apache.beam.sdk.transforms.windowing"><code>WindowFn</code></a> associated with it as the input.</div>
<dl>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../../../serialized-form.html#org.apache.beam.sdk.transforms.Partition">Serialized Form</a></dd>
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<td class="colFirst"><code>static interface&nbsp;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/transforms/Partition.PartitionFn.html" title="interface in org.apache.beam.sdk.transforms">Partition.PartitionFn</a>&lt;<a href="../../../../../org/apache/beam/sdk/transforms/Partition.PartitionFn.html" title="type parameter in Partition.PartitionFn">T</a>&gt;</span></code>
<div class="block">A function object that chooses an output partition for an element.</div>
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<code><a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html#name">name</a></code></li>
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<caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd">&nbsp;</span></span><span id="t1" class="tableTab"><span><a href="javascript:show(1);">Static Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd">&nbsp;</span></span></caption>
<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Method and Description</th>
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<tr id="i0" class="altColor">
<td class="colFirst"><code><a href="../../../../../org/apache/beam/sdk/values/PCollectionList.html" title="class in org.apache.beam.sdk.values">PCollectionList</a>&lt;<a href="../../../../../org/apache/beam/sdk/transforms/Partition.html" title="type parameter in Partition">T</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/transforms/Partition.html#expand-org.apache.beam.sdk.values.PCollection-">expand</a></span>(<a href="../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values">PCollection</a>&lt;<a href="../../../../../org/apache/beam/sdk/transforms/Partition.html" title="type parameter in Partition">T</a>&gt;&nbsp;in)</code>
<div class="block">Override this method to specify how this <code>PTransform</code> should be expanded on the given
<code>InputT</code>.</div>
</td>
</tr>
<tr id="i1" class="rowColor">
<td class="colFirst"><code>static &lt;T&gt;&nbsp;<a href="../../../../../org/apache/beam/sdk/transforms/Partition.html" title="class in org.apache.beam.sdk.transforms">Partition</a>&lt;T&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/transforms/Partition.html#of-int-org.apache.beam.sdk.transforms.Partition.PartitionFn-">of</a></span>(int&nbsp;numPartitions,
<a href="../../../../../org/apache/beam/sdk/transforms/Partition.PartitionFn.html" title="interface in org.apache.beam.sdk.transforms">Partition.PartitionFn</a>&lt;? super T&gt;&nbsp;partitionFn)</code>
<div class="block">Returns a new <code>Partition</code> <code>PTransform</code> that divides its input <code>PCollection</code>
into the given number of partitions, using the given partitioning function.</div>
</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/transforms/Partition.html#populateDisplayData-org.apache.beam.sdk.transforms.display.DisplayData.Builder-">populateDisplayData</a></span>(<a href="../../../../../org/apache/beam/sdk/transforms/display/DisplayData.Builder.html" title="interface in org.apache.beam.sdk.transforms.display">DisplayData.Builder</a>&nbsp;builder)</code>
<div class="block">Register display data for the given transform or component.</div>
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<code><a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html#compose-org.apache.beam.sdk.transforms.SerializableFunction-">compose</a>, <a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html#getAdditionalInputs--">getAdditionalInputs</a>, <a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html#getDefaultOutputCoder--">getDefaultOutputCoder</a>, <a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html#getDefaultOutputCoder-InputT-">getDefaultOutputCoder</a>, <a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html#getDefaultOutputCoder-InputT-org.apache.beam.sdk.values.PCollection-">getDefaultOutputCoder</a>, <a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html#getKindString--">getKindString</a>, <a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html#getName--">getName</a>, <a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html#toString--">toString</a>, <a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html#validate-org.apache.beam.sdk.options.PipelineOptions-">validate</a></code></li>
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<h4>of</h4>
<pre>public static&nbsp;&lt;T&gt;&nbsp;<a href="../../../../../org/apache/beam/sdk/transforms/Partition.html" title="class in org.apache.beam.sdk.transforms">Partition</a>&lt;T&gt;&nbsp;of(int&nbsp;numPartitions,
<a href="../../../../../org/apache/beam/sdk/transforms/Partition.PartitionFn.html" title="interface in org.apache.beam.sdk.transforms">Partition.PartitionFn</a>&lt;? super T&gt;&nbsp;partitionFn)</pre>
<div class="block">Returns a new <code>Partition</code> <code>PTransform</code> that divides its input <code>PCollection</code>
into the given number of partitions, using the given partitioning function.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>numPartitions</code> - the number of partitions to divide the input <code>PCollection</code> into</dd>
<dd><code>partitionFn</code> - the function to invoke on each element to choose its output partition</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code>java.lang.IllegalArgumentException</code> - if <code>numPartitions &lt;= 0</code></dd>
</dl>
</li>
</ul>
<a name="expand-org.apache.beam.sdk.values.PCollection-">
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<h4>expand</h4>
<pre>public&nbsp;<a href="../../../../../org/apache/beam/sdk/values/PCollectionList.html" title="class in org.apache.beam.sdk.values">PCollectionList</a>&lt;<a href="../../../../../org/apache/beam/sdk/transforms/Partition.html" title="type parameter in Partition">T</a>&gt;&nbsp;expand(<a href="../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values">PCollection</a>&lt;<a href="../../../../../org/apache/beam/sdk/transforms/Partition.html" title="type parameter in Partition">T</a>&gt;&nbsp;in)</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from class:&nbsp;<code><a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html#expand-InputT-">PTransform</a></code></span></div>
<div class="block">Override this method to specify how this <code>PTransform</code> should be expanded on the given
<code>InputT</code>.
<p>NOTE: This method should not be called directly. Instead apply the <code>PTransform</code> should
be applied to the <code>InputT</code> using the <code>apply</code> method.
<p>Composite transforms, which are defined in terms of other transforms, should return the
output of one of the composed transforms. Non-composite transforms, which do not apply any
transforms internally, should return a new unbound output and register evaluators (via
backend-specific registration methods).</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html#expand-InputT-">expand</a></code>&nbsp;in class&nbsp;<code><a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html" title="class in org.apache.beam.sdk.transforms">PTransform</a>&lt;<a href="../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values">PCollection</a>&lt;<a href="../../../../../org/apache/beam/sdk/transforms/Partition.html" title="type parameter in Partition">T</a>&gt;,<a href="../../../../../org/apache/beam/sdk/values/PCollectionList.html" title="class in org.apache.beam.sdk.values">PCollectionList</a>&lt;<a href="../../../../../org/apache/beam/sdk/transforms/Partition.html" title="type parameter in Partition">T</a>&gt;&gt;</code></dd>
</dl>
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<h4>populateDisplayData</h4>
<pre>public&nbsp;void&nbsp;populateDisplayData(<a href="../../../../../org/apache/beam/sdk/transforms/display/DisplayData.Builder.html" title="interface in org.apache.beam.sdk.transforms.display">DisplayData.Builder</a>&nbsp;builder)</pre>
<div class="block"><span class="descfrmTypeLabel">Description copied from class:&nbsp;<code><a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html#populateDisplayData-org.apache.beam.sdk.transforms.display.DisplayData.Builder-">PTransform</a></code></span></div>
<div class="block">Register display data for the given transform or component.
<p><code>populateDisplayData(DisplayData.Builder)</code> is invoked by Pipeline runners to collect
display data via <a href="../../../../../org/apache/beam/sdk/transforms/display/DisplayData.html#from-org.apache.beam.sdk.transforms.display.HasDisplayData-"><code>DisplayData.from(HasDisplayData)</code></a>. Implementations may call <code>super.populateDisplayData(builder)</code> in order to register display data in the current namespace,
but should otherwise use <code>subcomponent.populateDisplayData(builder)</code> to use the namespace
of the subcomponent.
<p>By default, does not register any display data. Implementors may override this method to
provide their own display data.</div>
<dl>
<dt><span class="overrideSpecifyLabel">Specified by:</span></dt>
<dd><code><a href="../../../../../org/apache/beam/sdk/transforms/display/HasDisplayData.html#populateDisplayData-org.apache.beam.sdk.transforms.display.DisplayData.Builder-">populateDisplayData</a></code>&nbsp;in interface&nbsp;<code><a href="../../../../../org/apache/beam/sdk/transforms/display/HasDisplayData.html" title="interface in org.apache.beam.sdk.transforms.display">HasDisplayData</a></code></dd>
<dt><span class="overrideSpecifyLabel">Overrides:</span></dt>
<dd><code><a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html#populateDisplayData-org.apache.beam.sdk.transforms.display.DisplayData.Builder-">populateDisplayData</a></code>&nbsp;in class&nbsp;<code><a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html" title="class in org.apache.beam.sdk.transforms">PTransform</a>&lt;<a href="../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values">PCollection</a>&lt;<a href="../../../../../org/apache/beam/sdk/transforms/Partition.html" title="type parameter in Partition">T</a>&gt;,<a href="../../../../../org/apache/beam/sdk/values/PCollectionList.html" title="class in org.apache.beam.sdk.values">PCollectionList</a>&lt;<a href="../../../../../org/apache/beam/sdk/transforms/Partition.html" title="type parameter in Partition">T</a>&gt;&gt;</code></dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>builder</code> - The builder to populate with display data.</dd>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../../../../org/apache/beam/sdk/transforms/display/HasDisplayData.html" title="interface in org.apache.beam.sdk.transforms.display"><code>HasDisplayData</code></a></dd>
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