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| <div class="subTitle">org.apache.beam.sdk.extensions.sketching</div> |
| <h2 title="Class SketchFrequencies" class="title">Class SketchFrequencies</h2> |
| </div> |
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| <ul class="inheritance"> |
| <li>java.lang.Object</li> |
| <li> |
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| <li>org.apache.beam.sdk.extensions.sketching.SketchFrequencies</li> |
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| <pre><a href="../../../../../../org/apache/beam/sdk/annotations/Experimental.html" title="annotation in org.apache.beam.sdk.annotations">@Experimental</a> |
| public final class <span class="typeNameLabel">SketchFrequencies</span> |
| extends java.lang.Object</pre> |
| <div class="block"><code>PTransform</code>s to compute the estimate frequency of each element in a stream. |
| |
| <p>This class uses the Count-min Sketch structure which allows very efficient queries on the data |
| stream summarization. |
| |
| <h2>References</h2> |
| |
| <p>The implementation comes from <a href="https://github.com/addthis/stream-lib">Addthis' |
| Stream-lib library</a>. <br> |
| The papers and other useful information about Count-Min Sketch are available on <a |
| href="https://sites.google.com/site/countminsketch/">this website</a>. <br> |
| |
| <h2>Parameters</h2> |
| |
| <p>Two parameters can be tuned in order to control the accuracy of the computation: |
| |
| <ul> |
| <li><b>Relative Error:</b> <br> |
| The relative error "<code>epsilon</code>" controls the accuracy of the estimation. By default, |
| the relative is around <code>1%</code> of the total count. |
| <li><b>Confidence</b> <br> |
| The relative error can be guaranteed only with a certain "<code>confidence</code>", between 0 |
| and 1 (1 being of course impossible). <br> |
| The default value is set to 0.999 meaning that we can guarantee that the relative error |
| will not exceed 1% of the total count in 99.9% of cases. |
| </ul> |
| |
| <p>These two parameters will determine the size of the Count-min sketch, which is a |
| two-dimensional array with depth and width defined as follows : |
| |
| <ul> |
| <li><code>width = ceil(2 / epsilon)</code> |
| <li><code>depth = ceil(-log(1 - confidence) / log(2))</code> |
| </ul> |
| |
| <p>With the default values, this gives a depth of 200 and a width of 10. |
| |
| <p><b>WARNING:</b> The relative error concerns the total number of distinct elements in a stream. |
| Thus, an element having 1000 occurrences in a stream of 1 million distinct elements will have 1% |
| of 1 million as relative error, i.e. 10 000. This means the frequency is 1000 +/- 10 000 for this |
| element. Therefore this is obvious that the relative error must be really low in very large |
| streams. <br> |
| Also keep in mind that this algorithm works well on highly skewed data but gives poor results if |
| the elements are evenly distributed. |
| |
| <h2>Examples</h2> |
| |
| <p>There are 2 ways of using this class: |
| |
| <ul> |
| <li>Use the <a href="../../../../../../org/apache/beam/sdk/transforms/PTransform.html" title="class in org.apache.beam.sdk.transforms"><code>PTransform</code></a>s that return a <a href="../../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values"><code>PCollection</code></a> singleton that contains a |
| Count-min sketch for querying the estimate number of hits of the elements. |
| <li>Use the <a href="../../../../../../org/apache/beam/sdk/extensions/sketching/SketchFrequencies.CountMinSketchFn.html" title="class in org.apache.beam.sdk.extensions.sketching"><code>SketchFrequencies.CountMinSketchFn</code></a> <code>CombineFn</code> that is exposed in order to make |
| advanced processing involving the Count-Min sketch. |
| </ul> |
| |
| <h3>Example 1: default use</h3> |
| |
| <p>The simplest use is to call the <a href="../../../../../../org/apache/beam/sdk/extensions/sketching/SketchFrequencies.html#globally--"><code>globally()</code></a> or <a href="../../../../../../org/apache/beam/sdk/extensions/sketching/SketchFrequencies.html#perKey--"><code>perKey()</code></a> method in order to |
| retrieve the sketch with an estimate number of hits for each element in the stream. |
| |
| <pre><code> |
| PCollection<MyObject> pc = ...; |
| PCollection<CountMinSketch> countMinSketch = pc.apply(SketchFrequencies |
| .<MyObject>globally()); // .<MyObject>perKey(); |
| </code></pre> |
| |
| <h3>Example 2: tune accuracy parameters</h3> |
| |
| <p>One can tune the <code>epsilon</code> and <code>confidence</code> parameters in order to control |
| accuracy and memory. <br> |
| The tuning works exactly the same for <a href="../../../../../../org/apache/beam/sdk/extensions/sketching/SketchFrequencies.html#globally--"><code>globally()</code></a> and <a href="../../../../../../org/apache/beam/sdk/extensions/sketching/SketchFrequencies.html#perKey--"><code>perKey()</code></a>. |
| |
| <pre><code> |
| double eps = 0.001; |
| double conf = 0.9999; |
| PCollection<MyObject> pc = ...; |
| PCollection<CountMinSketch> countMinSketch = pc.apply(SketchFrequencies |
| .<MyObject>globally() // .<MyObject>perKey() |
| .withRelativeError(eps) |
| .withConfidence(conf)); |
| </code></pre> |
| |
| <h3>Example 3: query the resulting sketch</h3> |
| |
| <p>This example shows how to query the resulting <a href="../../../../../../org/apache/beam/sdk/extensions/sketching/SketchFrequencies.Sketch.html" title="class in org.apache.beam.sdk.extensions.sketching"><code>SketchFrequencies.Sketch</code></a>. To estimate the number of hits |
| of an element, one has to use <a href="../../../../../../org/apache/beam/sdk/extensions/sketching/SketchFrequencies.Sketch.html#estimateCount-T-org.apache.beam.sdk.coders.Coder-"><code>SketchFrequencies.Sketch.estimateCount(Object, Coder)</code></a> method and to provide |
| the coder for the element type. <br> |
| For instance, one can build a KV Pair linking each element to an estimation of its frequency, |
| using the sketch as side input of a <a href="../../../../../../org/apache/beam/sdk/transforms/ParDo.html" title="class in org.apache.beam.sdk.transforms"><code>ParDo</code></a>. <br> |
| |
| <pre><code> |
| PCollection<MyObject> pc = ...; |
| PCollection<CountMinSketch> countMinSketch = pc.apply(SketchFrequencies |
| .<MyObject>globally()); |
| |
| // Retrieve the coder for MyObject |
| final Coder<MyObject> = pc.getCoder(); |
| // build a View of the sketch so it can be passed a sideInput |
| final PCollectionView<CountMinSketch> sketchView = sketch.apply(View |
| .<CountMinSketch>asSingleton()); |
| |
| PCollection<KV<MyObject, Long>> pairs = pc.apply(ParDo.of( |
| new DoFn<Long, KV<MyObject, Long>>() { |
| @ProcessElement |
| public void processElement(ProcessContext c) { |
| Long elem = c.element(); |
| CountMinSketch sketch = c.sideInput(sketchView); |
| c.output(sketch.estimateCount(elem, coder)); |
| }}).withSideInputs(sketchView)); |
| </code></pre> |
| |
| <h3>Example 4: Using the CombineFn</h3> |
| |
| <p>The <code>CombineFn</code> does the same thing as the <code>PTransform</code>s but it can be used for |
| doing stateful processing or in <a href="../../../../../../org/apache/beam/sdk/transforms/CombineFns.ComposedCombineFn.html" title="class in org.apache.beam.sdk.transforms"><code>CombineFns.ComposedCombineFn</code></a>. |
| |
| <p>This example is not really interesting but it shows how you can properly create a <a href="../../../../../../org/apache/beam/sdk/extensions/sketching/SketchFrequencies.CountMinSketchFn.html" title="class in org.apache.beam.sdk.extensions.sketching"><code>SketchFrequencies.CountMinSketchFn</code></a>. One must always specify a coder using the <a href="../../../../../../org/apache/beam/sdk/extensions/sketching/SketchFrequencies.CountMinSketchFn.html#create-org.apache.beam.sdk.coders.Coder-"><code>SketchFrequencies.CountMinSketchFn.create(Coder)</code></a> method. |
| |
| <pre><code> |
| double eps = 0.0001; |
| double conf = 0.9999; |
| PCollection<MyObject> input = ...; |
| PCollection<CountMinSketch> output = input.apply(Combine.globally(CountMinSketchFn |
| .<MyObject>create(new MyObjectCoder()) |
| .withAccuracy(eps, conf))); |
| </code></pre> |
| |
| <p><b>Warning: this class is experimental.</b> <br> |
| Its API is subject to change in future versions of Beam.</div> |
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| <th class="colLast" scope="col">Class and Description</th> |
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| <tr class="altColor"> |
| <td class="colFirst"><code>static class </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/sdk/extensions/sketching/SketchFrequencies.CountMinSketchFn.html" title="class in org.apache.beam.sdk.extensions.sketching">SketchFrequencies.CountMinSketchFn</a><<a href="../../../../../../org/apache/beam/sdk/extensions/sketching/SketchFrequencies.CountMinSketchFn.html" title="type parameter in SketchFrequencies.CountMinSketchFn">InputT</a>></span></code> |
| <div class="block">Implements the <a href="../../../../../../org/apache/beam/sdk/transforms/Combine.CombineFn.html" title="class in org.apache.beam.sdk.transforms"><code>Combine.CombineFn</code></a> of <a href="../../../../../../org/apache/beam/sdk/extensions/sketching/SketchFrequencies.html" title="class in org.apache.beam.sdk.extensions.sketching"><code>SketchFrequencies</code></a> transforms.</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/extensions/sketching/SketchFrequencies.GlobalSketch.html" title="class in org.apache.beam.sdk.extensions.sketching">SketchFrequencies.GlobalSketch</a><<a href="../../../../../../org/apache/beam/sdk/extensions/sketching/SketchFrequencies.GlobalSketch.html" title="type parameter in SketchFrequencies.GlobalSketch">InputT</a>></span></code> |
| <div class="block">Implementation of <a href="../../../../../../org/apache/beam/sdk/extensions/sketching/SketchFrequencies.html#globally--"><code>globally()</code></a>.</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/extensions/sketching/SketchFrequencies.PerKeySketch.html" title="class in org.apache.beam.sdk.extensions.sketching">SketchFrequencies.PerKeySketch</a><<a href="../../../../../../org/apache/beam/sdk/extensions/sketching/SketchFrequencies.PerKeySketch.html" title="type parameter in SketchFrequencies.PerKeySketch">K</a>,<a href="../../../../../../org/apache/beam/sdk/extensions/sketching/SketchFrequencies.PerKeySketch.html" title="type parameter in SketchFrequencies.PerKeySketch">V</a>></span></code> |
| <div class="block">Implementation of <a href="../../../../../../org/apache/beam/sdk/extensions/sketching/SketchFrequencies.html#perKey--"><code>perKey()</code></a>.</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/extensions/sketching/SketchFrequencies.Sketch.html" title="class in org.apache.beam.sdk.extensions.sketching">SketchFrequencies.Sketch</a><<a href="../../../../../../org/apache/beam/sdk/extensions/sketching/SketchFrequencies.Sketch.html" title="type parameter in SketchFrequencies.Sketch">T</a>></span></code> |
| <div class="block">Wrap StreamLib's Count-Min Sketch to support counting all user types by hashing the encoded |
| user type using the supplied deterministic coder.</div> |
| </td> |
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| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/sdk/extensions/sketching/SketchFrequencies.html#SketchFrequencies--">SketchFrequencies</a></span>()</code> </td> |
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| <td class="colFirst"><code>static <InputT> <a href="../../../../../../org/apache/beam/sdk/extensions/sketching/SketchFrequencies.GlobalSketch.html" title="class in org.apache.beam.sdk.extensions.sketching">SketchFrequencies.GlobalSketch</a><InputT></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/sdk/extensions/sketching/SketchFrequencies.html#globally--">globally</a></span>()</code> |
| <div class="block">Create the <a href="../../../../../../org/apache/beam/sdk/transforms/PTransform.html" title="class in org.apache.beam.sdk.transforms"><code>PTransform</code></a> that will build a Count-min sketch for keeping track of the |
| frequency of the elements in the whole stream.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>static <K,V> <a href="../../../../../../org/apache/beam/sdk/extensions/sketching/SketchFrequencies.PerKeySketch.html" title="class in org.apache.beam.sdk.extensions.sketching">SketchFrequencies.PerKeySketch</a><K,V></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/sdk/extensions/sketching/SketchFrequencies.html#perKey--">perKey</a></span>()</code> |
| <div class="block">Like <a href="../../../../../../org/apache/beam/sdk/extensions/sketching/SketchFrequencies.html#globally--"><code>globally()</code></a> but per key, i.e a Count-min sketch per key in <code>PCollection<KV<K, V>></code> and returns a <code>PCollection<KV<K, {@link CountMinSketch}>></code>.</div> |
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| <h4>SketchFrequencies</h4> |
| <pre>public SketchFrequencies()</pre> |
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| <h4>globally</h4> |
| <pre>public static <InputT> <a href="../../../../../../org/apache/beam/sdk/extensions/sketching/SketchFrequencies.GlobalSketch.html" title="class in org.apache.beam.sdk.extensions.sketching">SketchFrequencies.GlobalSketch</a><InputT> globally()</pre> |
| <div class="block">Create the <a href="../../../../../../org/apache/beam/sdk/transforms/PTransform.html" title="class in org.apache.beam.sdk.transforms"><code>PTransform</code></a> that will build a Count-min sketch for keeping track of the |
| frequency of the elements in the whole stream. |
| |
| <p>It returns a <code>PCollection<{@link CountMinSketch}></code> that can be queried in order to |
| obtain estimations of the elements' frequencies.</div> |
| <dl> |
| <dt><span class="paramLabel">Type Parameters:</span></dt> |
| <dd><code>InputT</code> - the type of the elements in the input <a href="../../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values"><code>PCollection</code></a></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="perKey--"> |
| <!-- --> |
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| <h4>perKey</h4> |
| <pre>public static <K,V> <a href="../../../../../../org/apache/beam/sdk/extensions/sketching/SketchFrequencies.PerKeySketch.html" title="class in org.apache.beam.sdk.extensions.sketching">SketchFrequencies.PerKeySketch</a><K,V> perKey()</pre> |
| <div class="block">Like <a href="../../../../../../org/apache/beam/sdk/extensions/sketching/SketchFrequencies.html#globally--"><code>globally()</code></a> but per key, i.e a Count-min sketch per key in <code>PCollection<KV<K, V>></code> and returns a <code>PCollection<KV<K, {@link CountMinSketch}>></code>.</div> |
| <dl> |
| <dt><span class="paramLabel">Type Parameters:</span></dt> |
| <dd><code>K</code> - type of the keys mapping the elements</dd> |
| <dd><code>V</code> - type of the values being combined per key</dd> |
| </dl> |
| </li> |
| </ul> |
| </li> |
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