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<div class="subTitle">org.apache.beam.sdk.transforms</div>
<h2 title="Class Sample" class="title">Class Sample</h2>
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<pre>public class <span class="typeNameLabel">Sample</span>
extends java.lang.Object</pre>
<div class="block"><code>PTransform</code>s for taking samples of the elements in a <code>PCollection</code>, or samples of
the values associated with each key in a <code>PCollection</code> of <code>KV</code>s.
<p><a href="../../../../../org/apache/beam/sdk/transforms/Sample.html#fixedSizeGlobally-int-"><code>fixedSizeGlobally(int)</code></a> and <a href="../../../../../org/apache/beam/sdk/transforms/Sample.html#fixedSizePerKey-int-"><code>fixedSizePerKey(int)</code></a> compute uniformly random
samples. <a href="../../../../../org/apache/beam/sdk/transforms/Sample.html#any-long-"><code>any(long)</code></a> is faster, but provides no uniformity guarantees.
<p><a href="../../../../../org/apache/beam/sdk/transforms/Sample.html#combineFn-int-"><code>combineFn(int)</code></a> can also be used manually, in combination with state and with the <a href="../../../../../org/apache/beam/sdk/transforms/Combine.html" title="class in org.apache.beam.sdk.transforms"><code>Combine</code></a> transform.</div>
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<td class="colFirst"><code>static class&nbsp;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/transforms/Sample.FixedSizedSampleFn.html" title="class in org.apache.beam.sdk.transforms">Sample.FixedSizedSampleFn</a>&lt;<a href="../../../../../org/apache/beam/sdk/transforms/Sample.FixedSizedSampleFn.html" title="type parameter in Sample.FixedSizedSampleFn">T</a>&gt;</span></code>
<div class="block"><code>CombineFn</code> that computes a fixed-size sample of a collection of values.</div>
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<td class="colFirst"><code>static &lt;T&gt;&nbsp;<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/PCollection.html" title="class in org.apache.beam.sdk.values">PCollection</a>&lt;T&gt;&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/transforms/Sample.html#any-long-">any</a></span>(long&nbsp;limit)</code>
<div class="block"><code>Sample#any(long)</code> takes a <code>PCollection&lt;T&gt;</code> and a limit, and produces a new <code>PCollection&lt;T&gt;</code> containing up to limit elements of the input <code>PCollection</code>.</div>
</td>
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<tr id="i1" class="rowColor">
<td class="colFirst"><code>static &lt;T&gt;&nbsp;<a href="../../../../../org/apache/beam/sdk/transforms/Combine.CombineFn.html" title="class in org.apache.beam.sdk.transforms">Combine.CombineFn</a>&lt;T,?,java.lang.Iterable&lt;T&gt;&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/transforms/Sample.html#anyCombineFn-int-">anyCombineFn</a></span>(int&nbsp;sampleSize)</code>
<div class="block">Returns a <a href="../../../../../org/apache/beam/sdk/transforms/Combine.CombineFn.html" title="class in org.apache.beam.sdk.transforms"><code>Combine.CombineFn</code></a> that computes a fixed-sized potentially non-uniform sample of its
inputs.</div>
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<tr id="i2" class="altColor">
<td class="colFirst"><code>static &lt;T&gt;&nbsp;<a href="../../../../../org/apache/beam/sdk/transforms/Combine.CombineFn.html" title="class in org.apache.beam.sdk.transforms">Combine.CombineFn</a>&lt;T,?,java.lang.Iterable&lt;T&gt;&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/transforms/Sample.html#combineFn-int-">combineFn</a></span>(int&nbsp;sampleSize)</code>
<div class="block">Returns a <a href="../../../../../org/apache/beam/sdk/transforms/Combine.CombineFn.html" title="class in org.apache.beam.sdk.transforms"><code>Combine.CombineFn</code></a> that computes a fixed-sized uniform sample of its inputs.</div>
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<tr id="i3" class="rowColor">
<td class="colFirst"><code>static &lt;T&gt;&nbsp;<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/PCollection.html" title="class in org.apache.beam.sdk.values">PCollection</a>&lt;java.lang.Iterable&lt;T&gt;&gt;&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/transforms/Sample.html#fixedSizeGlobally-int-">fixedSizeGlobally</a></span>(int&nbsp;sampleSize)</code>
<div class="block">Returns a <code>PTransform</code> that takes a <code>PCollection&lt;T&gt;</code>, selects <code>sampleSize</code>
elements, uniformly at random, and returns a <code>PCollection&lt;Iterable&lt;T&gt;&gt;</code> containing the
selected elements.</div>
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<tr id="i4" class="altColor">
<td class="colFirst"><code>static &lt;K,V&gt;&nbsp;<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/values/KV.html" title="class in org.apache.beam.sdk.values">KV</a>&lt;K,V&gt;&gt;,<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/values/KV.html" title="class in org.apache.beam.sdk.values">KV</a>&lt;K,java.lang.Iterable&lt;V&gt;&gt;&gt;&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/transforms/Sample.html#fixedSizePerKey-int-">fixedSizePerKey</a></span>(int&nbsp;sampleSize)</code>
<div class="block">Returns a <code>PTransform</code> that takes an input <code>PCollection&lt;KV&lt;K, V&gt;&gt;</code> and returns a
<code>PCollection&lt;KV&lt;K, Iterable&lt;V&gt;&gt;&gt;</code> that contains an output element mapping each distinct
key in the input <code>PCollection</code> to a sample of <code>sampleSize</code> values associated with
that key in the input <code>PCollection</code>, taken uniformly at random.</div>
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<pre>public&nbsp;Sample()</pre>
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<pre>public static&nbsp;&lt;T&gt;&nbsp;<a href="../../../../../org/apache/beam/sdk/transforms/Combine.CombineFn.html" title="class in org.apache.beam.sdk.transforms">Combine.CombineFn</a>&lt;T,?,java.lang.Iterable&lt;T&gt;&gt;&nbsp;combineFn(int&nbsp;sampleSize)</pre>
<div class="block">Returns a <a href="../../../../../org/apache/beam/sdk/transforms/Combine.CombineFn.html" title="class in org.apache.beam.sdk.transforms"><code>Combine.CombineFn</code></a> that computes a fixed-sized uniform sample of its inputs.</div>
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<pre>public static&nbsp;&lt;T&gt;&nbsp;<a href="../../../../../org/apache/beam/sdk/transforms/Combine.CombineFn.html" title="class in org.apache.beam.sdk.transforms">Combine.CombineFn</a>&lt;T,?,java.lang.Iterable&lt;T&gt;&gt;&nbsp;anyCombineFn(int&nbsp;sampleSize)</pre>
<div class="block">Returns a <a href="../../../../../org/apache/beam/sdk/transforms/Combine.CombineFn.html" title="class in org.apache.beam.sdk.transforms"><code>Combine.CombineFn</code></a> that computes a fixed-sized potentially non-uniform sample of its
inputs.</div>
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<h4>any</h4>
<pre>public static&nbsp;&lt;T&gt;&nbsp;<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/PCollection.html" title="class in org.apache.beam.sdk.values">PCollection</a>&lt;T&gt;&gt;&nbsp;any(long&nbsp;limit)</pre>
<div class="block"><code>Sample#any(long)</code> takes a <code>PCollection&lt;T&gt;</code> and a limit, and produces a new <code>PCollection&lt;T&gt;</code> containing up to limit elements of the input <code>PCollection</code>.
<p>If limit is greater than or equal to the size of the input <code>PCollection</code>, then all the
input's elements will be selected.
<p>Example of use:
<pre><code>
PCollection&lt;String&gt; input = ...;
PCollection&lt;String&gt; output = input.apply(Sample.&lt;String&gt;any(100));
</code></pre></div>
<dl>
<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>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>limit</code> - the number of elements to take from the input</dd>
</dl>
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<h4>fixedSizeGlobally</h4>
<pre>public static&nbsp;&lt;T&gt;&nbsp;<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/PCollection.html" title="class in org.apache.beam.sdk.values">PCollection</a>&lt;java.lang.Iterable&lt;T&gt;&gt;&gt;&nbsp;fixedSizeGlobally(int&nbsp;sampleSize)</pre>
<div class="block">Returns a <code>PTransform</code> that takes a <code>PCollection&lt;T&gt;</code>, selects <code>sampleSize</code>
elements, uniformly at random, and returns a <code>PCollection&lt;Iterable&lt;T&gt;&gt;</code> containing the
selected elements. If the input <code>PCollection</code> has fewer than <code>sampleSize</code> elements,
then the output <code>Iterable&lt;T&gt;</code> will be all the input's elements.
<p>All of the elements of the output <code>PCollection</code> should fit into main memory of a
single worker machine. This operation does not run in parallel.
<p>Example of use:
<pre><code>
PCollection&lt;String&gt; pc = ...;
PCollection&lt;Iterable&lt;String&gt;&gt; sampleOfSize10 =
pc.apply(Sample.fixedSizeGlobally(10));
</code></pre></div>
<dl>
<dt><span class="paramLabel">Type Parameters:</span></dt>
<dd><code>T</code> - the type of the elements</dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>sampleSize</code> - the number of elements to select; must be <code>&gt;= 0</code></dd>
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<pre>public static&nbsp;&lt;K,V&gt;&nbsp;<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/values/KV.html" title="class in org.apache.beam.sdk.values">KV</a>&lt;K,V&gt;&gt;,<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/values/KV.html" title="class in org.apache.beam.sdk.values">KV</a>&lt;K,java.lang.Iterable&lt;V&gt;&gt;&gt;&gt;&nbsp;fixedSizePerKey(int&nbsp;sampleSize)</pre>
<div class="block">Returns a <code>PTransform</code> that takes an input <code>PCollection&lt;KV&lt;K, V&gt;&gt;</code> and returns a
<code>PCollection&lt;KV&lt;K, Iterable&lt;V&gt;&gt;&gt;</code> that contains an output element mapping each distinct
key in the input <code>PCollection</code> to a sample of <code>sampleSize</code> values associated with
that key in the input <code>PCollection</code>, taken uniformly at random. If a key in the input
<code>PCollection</code> has fewer than <code>sampleSize</code> values associated with it, then the
output <code>Iterable&lt;V&gt;</code> associated with that key will be all the values associated with that
key in the input <code>PCollection</code>.
<p>Example of use:
<pre><code>
PCollection&lt;KV&lt;String, Integer&gt;&gt; pc = ...;
PCollection&lt;KV&lt;String, Iterable&lt;Integer&gt;&gt;&gt; sampleOfSize10PerKey =
pc.apply(Sample.&lt;String, Integer&gt;fixedSizePerKey());
</code></pre></div>
<dl>
<dt><span class="paramLabel">Type Parameters:</span></dt>
<dd><code>K</code> - the type of the keys</dd>
<dd><code>V</code> - the type of the values</dd>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>sampleSize</code> - the number of values to select for each distinct key; must be <code>&gt;= 0</code></dd>
</dl>
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