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| <h2 title="Class ApproximateUnique" class="title">Class ApproximateUnique</h2> |
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| <ul class="inheritance"> |
| <li>java.lang.Object</li> |
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| <pre>public class <span class="typeNameLabel">ApproximateUnique</span> |
| extends java.lang.Object</pre> |
| <div class="block"><code>PTransform</code>s for estimating the number of distinct elements in a <code>PCollection</code>, or |
| the number of distinct values associated with each key in a <code>PCollection</code> of <code>KV</code>s. |
| |
| <p>Consider using <code>HllCount</code> in the <code>zetasketch</code> extension module if you need better |
| performance or need to save intermediate aggregation result into a sketch for later processing. |
| |
| <p>For example, to estimate the number of distinct elements in a <code>PCollection<String></code>: |
| |
| <pre><code> |
| PCollection<String> input = ...; |
| PCollection<Long> countDistinct = |
| input.apply(HllCount.Init.forStrings().globally()).apply(HllCount.Extract.globally()); |
| </code></pre> |
| |
| For more details about using <code>HllCount</code> and the <code>zetasketch</code> extension module, see |
| https://s.apache.org/hll-in-beam#bookmark=id.v6chsij1ixo7.</div> |
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| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>static class </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/transforms/ApproximateUnique.ApproximateUniqueCombineFn.html" title="class in org.apache.beam.sdk.transforms">ApproximateUnique.ApproximateUniqueCombineFn</a><<a href="../../../../../org/apache/beam/sdk/transforms/ApproximateUnique.ApproximateUniqueCombineFn.html" title="type parameter in ApproximateUnique.ApproximateUniqueCombineFn">T</a>></span></code> |
| <div class="block"><code>CombineFn</code> that computes an estimate of the number of distinct values that were |
| combined.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>static class </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/transforms/ApproximateUnique.Globally.html" title="class in org.apache.beam.sdk.transforms">ApproximateUnique.Globally</a><<a href="../../../../../org/apache/beam/sdk/transforms/ApproximateUnique.Globally.html" title="type parameter in ApproximateUnique.Globally">T</a>></span></code> |
| <div class="block"><code>PTransform</code> for estimating the number of distinct elements in a <code>PCollection</code>.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>static class </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/transforms/ApproximateUnique.PerKey.html" title="class in org.apache.beam.sdk.transforms">ApproximateUnique.PerKey</a><<a href="../../../../../org/apache/beam/sdk/transforms/ApproximateUnique.PerKey.html" title="type parameter in ApproximateUnique.PerKey">K</a>,<a href="../../../../../org/apache/beam/sdk/transforms/ApproximateUnique.PerKey.html" title="type parameter in ApproximateUnique.PerKey">V</a>></span></code> |
| <div class="block"><code>PTransform</code> for estimating the number of distinct values associated with each key in a |
| <code>PCollection</code> of <code>KV</code>s.</div> |
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| <td class="colFirst"><code>static <T> <a href="../../../../../org/apache/beam/sdk/transforms/ApproximateUnique.Globally.html" title="class in org.apache.beam.sdk.transforms">ApproximateUnique.Globally</a><T></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/transforms/ApproximateUnique.html#globally-double-">globally</a></span>(double maximumEstimationError)</code> |
| <div class="block">Like <a href="../../../../../org/apache/beam/sdk/transforms/ApproximateUnique.html#globally-int-"><code>globally(int)</code></a>, but specifies the desired maximum estimation error instead of the |
| sample size.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>static <T> <a href="../../../../../org/apache/beam/sdk/transforms/ApproximateUnique.Globally.html" title="class in org.apache.beam.sdk.transforms">ApproximateUnique.Globally</a><T></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/transforms/ApproximateUnique.html#globally-int-">globally</a></span>(int sampleSize)</code> |
| <div class="block">Returns a <code>PTransform</code> that takes a <code>PCollection<T></code> and returns a <code>PCollection<Long></code> containing a single value that is an estimate of the number of distinct |
| elements in the input <code>PCollection</code>.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>static <K,V> <a href="../../../../../org/apache/beam/sdk/transforms/ApproximateUnique.PerKey.html" title="class in org.apache.beam.sdk.transforms">ApproximateUnique.PerKey</a><K,V></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/transforms/ApproximateUnique.html#perKey-double-">perKey</a></span>(double maximumEstimationError)</code> |
| <div class="block">Like <a href="../../../../../org/apache/beam/sdk/transforms/ApproximateUnique.html#perKey-int-"><code>perKey(int)</code></a>, but specifies the desired maximum estimation error instead of the |
| sample size.</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>static <K,V> <a href="../../../../../org/apache/beam/sdk/transforms/ApproximateUnique.PerKey.html" title="class in org.apache.beam.sdk.transforms">ApproximateUnique.PerKey</a><K,V></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/transforms/ApproximateUnique.html#perKey-int-">perKey</a></span>(int sampleSize)</code> |
| <div class="block">Returns a <code>PTransform</code> that takes a <code>PCollection<KV<K, V>></code> and returns a <code>PCollection<KV<K, Long>></code> that contains an output element mapping each distinct key in the |
| input <code>PCollection</code> to an estimate of the number of distinct values associated with that |
| key in the input <code>PCollection</code>.</div> |
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| <h4>ApproximateUnique</h4> |
| <pre>public ApproximateUnique()</pre> |
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| <h4>globally</h4> |
| <pre>public static <T> <a href="../../../../../org/apache/beam/sdk/transforms/ApproximateUnique.Globally.html" title="class in org.apache.beam.sdk.transforms">ApproximateUnique.Globally</a><T> globally(int sampleSize)</pre> |
| <div class="block">Returns a <code>PTransform</code> that takes a <code>PCollection<T></code> and returns a <code>PCollection<Long></code> containing a single value that is an estimate of the number of distinct |
| elements in the input <code>PCollection</code>. |
| |
| <p>The <code>sampleSize</code> parameter controls the estimation error. The error is about <code>2 |
| / sqrt(sampleSize)</code>, so for <code>ApproximateUnique.globally(10000)</code> the estimation error is |
| about 2%. Similarly, for <code>ApproximateUnique.of(16)</code> the estimation error is about 50%. If |
| there are fewer than <code>sampleSize</code> distinct elements then the returned result will be |
| exact with extremely high probability (the chance of a hash collision is about <code>sampleSize^2 / 2^65</code>). |
| |
| <p>This transform approximates the number of elements in a set by computing the top <code>sampleSize</code> hash values, and using that to extrapolate the size of the entire set of hash |
| values by assuming the rest of the hash values are as densely distributed as the top <code>sampleSize</code>. |
| |
| <p>See also <a href="../../../../../org/apache/beam/sdk/transforms/ApproximateUnique.html#globally-double-"><code>globally(double)</code></a>. |
| |
| <p>Example of use: |
| |
| <pre><code> |
| PCollection<String> pc = ...; |
| PCollection<Long> approxNumDistinct = |
| pc.apply(ApproximateUnique.<String>globally(1000)); |
| </code></pre></div> |
| <dl> |
| <dt><span class="paramLabel">Type Parameters:</span></dt> |
| <dd><code>T</code> - the type of the elements in the input <code>PCollection</code></dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>sampleSize</code> - the number of entries in the statistical sample; the higher this number, the |
| more accurate the estimate will be; should be <code>>= 16</code></dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code>java.lang.IllegalArgumentException</code> - if the <code>sampleSize</code> argument is too small</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="globally-double-"> |
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| <h4>globally</h4> |
| <pre>public static <T> <a href="../../../../../org/apache/beam/sdk/transforms/ApproximateUnique.Globally.html" title="class in org.apache.beam.sdk.transforms">ApproximateUnique.Globally</a><T> globally(double maximumEstimationError)</pre> |
| <div class="block">Like <a href="../../../../../org/apache/beam/sdk/transforms/ApproximateUnique.html#globally-int-"><code>globally(int)</code></a>, but specifies the desired maximum estimation error instead of the |
| sample size.</div> |
| <dl> |
| <dt><span class="paramLabel">Type Parameters:</span></dt> |
| <dd><code>T</code> - the type of the elements in the input <code>PCollection</code></dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>maximumEstimationError</code> - the maximum estimation error, which should be in the range <code>[0.01, 0.5]</code></dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code>java.lang.IllegalArgumentException</code> - if the <code>maximumEstimationError</code> argument is out of range</dd> |
| </dl> |
| </li> |
| </ul> |
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| <h4>perKey</h4> |
| <pre>public static <K,V> <a href="../../../../../org/apache/beam/sdk/transforms/ApproximateUnique.PerKey.html" title="class in org.apache.beam.sdk.transforms">ApproximateUnique.PerKey</a><K,V> perKey(int sampleSize)</pre> |
| <div class="block">Returns a <code>PTransform</code> that takes a <code>PCollection<KV<K, V>></code> and returns a <code>PCollection<KV<K, Long>></code> that contains an output element mapping each distinct key in the |
| input <code>PCollection</code> to an estimate of the number of distinct values associated with that |
| key in the input <code>PCollection</code>. |
| |
| <p>See <a href="../../../../../org/apache/beam/sdk/transforms/ApproximateUnique.html#globally-int-"><code>globally(int)</code></a> for an explanation of the <code>sampleSize</code> parameter. A |
| separate sampling is computed for each distinct key of the input. |
| |
| <p>See also <a href="../../../../../org/apache/beam/sdk/transforms/ApproximateUnique.html#perKey-double-"><code>perKey(double)</code></a>. |
| |
| <p>Example of use: |
| |
| <pre><code> |
| PCollection<KV<Integer, String>> pc = ...; |
| PCollection<KV<Integer, Long>> approxNumDistinctPerKey = |
| pc.apply(ApproximateUnique.<Integer, String>perKey(1000)); |
| </code></pre></div> |
| <dl> |
| <dt><span class="paramLabel">Type Parameters:</span></dt> |
| <dd><code>K</code> - the type of the keys in the input and output <code>PCollection</code>s</dd> |
| <dd><code>V</code> - the type of the values in the input <code>PCollection</code></dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>sampleSize</code> - the number of entries in the statistical sample; the higher this number, the |
| more accurate the estimate will be; should be <code>>= 16</code></dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code>java.lang.IllegalArgumentException</code> - if the <code>sampleSize</code> argument is too small</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="perKey-double-"> |
| <!-- --> |
| </a> |
| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>perKey</h4> |
| <pre>public static <K,V> <a href="../../../../../org/apache/beam/sdk/transforms/ApproximateUnique.PerKey.html" title="class in org.apache.beam.sdk.transforms">ApproximateUnique.PerKey</a><K,V> perKey(double maximumEstimationError)</pre> |
| <div class="block">Like <a href="../../../../../org/apache/beam/sdk/transforms/ApproximateUnique.html#perKey-int-"><code>perKey(int)</code></a>, but specifies the desired maximum estimation error instead of the |
| sample size.</div> |
| <dl> |
| <dt><span class="paramLabel">Type Parameters:</span></dt> |
| <dd><code>K</code> - the type of the keys in the input and output <code>PCollection</code>s</dd> |
| <dd><code>V</code> - the type of the values in the input <code>PCollection</code></dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>maximumEstimationError</code> - the maximum estimation error, which should be in the range <code>[0.01, 0.5]</code></dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code>java.lang.IllegalArgumentException</code> - if the <code>maximumEstimationError</code> argument is out of range</dd> |
| </dl> |
| </li> |
| </ul> |
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