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| <div class="collapse" id="collapse_background"> |
| <li><a href="/docs/Background/TheChallenge.html">•The Challenge</a></li> |
| <li><a href="/docs/Background/SketchOrigins.html">•Sketch Origins</a></li> |
| <li><a href="/docs/Background/SketchElements.html">•Sketch Elements</a></li> |
| <li><a href="/docs/Background/Presentations.html">•Presentations</a></li> |
| <li><a href="https://github.com/apache/datasketches-website/tree/master/docs/pdf/DataSketches_deck.pdf">•Overview Slide Deck</a></li> |
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| <li><a href="/docs/Architecture/MajorSketchFamilies.html">•The Major Sketch Families</a></li> |
| <li><a href="/docs/Architecture/LargeScale.html">•Large Scale Computing</a></li> |
| <li><a href="/docs/Architecture/KeyFeatures.html">•Key Features</a></li> |
| <li><a href="/docs/Architecture/SketchFeaturesMatrix.html">•Sketch Features Matrix</a></li> |
| <li><a href="/docs/Architecture/Components.html">•Components</a></li> |
| <li><a href="/docs/Architecture/SketchesByComponent.html">•Sketches by Component</a></li> |
| <li><a href="/docs/Architecture/SketchCriteria.html">•Sketch Criteria</a></li> |
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| <p id="memory-component"> |
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| <li><a href="/docs/Memory/MemoryComponent.html">•Memory Component</a></li> |
| <li><a href="/docs/Memory/MemoryPerformance.html">•Memory Component Performance</a></li> |
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| <li><a href="/docs/Architecture/OrderSensitivity.html">•Notes on Order Sensitivity</a></li> |
| <li><a href="/docs/Architecture/Concurrency.html">•Notes on Concurrency</a></li> |
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| <li><a href="/docs/DistinctCountFeaturesMatrix.html">•Features Matrix</a></li> |
| <li><a href="/docs/DistinctCountMeritComparisons.html">•Figures-of-Merit Comparison</a></li> |
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| <p id="cpc-sketches"> |
| <a data-toggle="collapse" class="menu collapsed" href="#collapse_cpc_sketches">CPC Sketches</a> |
| </p> |
| <div class="collapse" id="collapse_cpc_sketches"> |
| <li><a href="/docs/CPC/CPC.html">•CPC Sketch</a></li> |
| <li><a href="/docs/CPC/CpcPerformance.html">•CPC Sketch Performance</a></li> |
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| <a data-toggle="collapse" class="menu collapsed" href="#collapse_cpc_examples">CPC Examples</a> |
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| <li><a href="/docs/CPC/CpcJavaExample.html">•CPC Sketch Java Example</a></li> |
| <li><a href="/docs/CPC/CpcCppExample.html">•CPC Sketch C++ Example</a></li> |
| <li><a href="/docs/CPC/CpcPigExample.html">•CPC Sketch Pig UDFs</a></li> |
| <li><a href="/docs/CPC/CpcHiveExample.html">•CPC Sketch Hive UDFs</a></li> |
| </div> |
| </div> |
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| <p id="hyperloglog-sketches"> |
| <a data-toggle="collapse" class="menu collapsed" href="#collapse_hyperloglog_sketches">HyperLogLog Sketches</a> |
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| <li><a href="/docs/HLL/HLL.html">•HLL Sketch</a></li> |
| <li><a href="/docs/HLL/HllMap.html">•HLL Map Sketch</a></li> |
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| <p id="hll-examples"> |
| <a data-toggle="collapse" class="menu collapsed" href="#collapse_hll_examples">HLL Examples</a> |
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| <li><a href="/docs/HLL/HllJavaExample.html">•HLL Sketch Java Example</a></li> |
| <li><a href="/docs/HLL/HllCppExample.html">•HLL Sketch C++ Example</a></li> |
| <li><a href="/docs/HLL/HllPigUDFs.html">•HLL Sketch Pig UDFs</a></li> |
| <li><a href="/docs/HLL/HllHiveUDFs.html">•HLL Sketch Hive UDFs</a></li> |
| </div> |
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| <p id="hll-studies"> |
| <a data-toggle="collapse" class="menu collapsed" href="#collapse_hll_studies">HLL Studies</a> |
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| <div class="collapse" id="collapse_hll_studies"> |
| <li><a href="/docs/HLL/HllPerformance.html">•HLL Sketch Performance</a></li> |
| <li><a href="/docs/HLL/Hll_vs_CS_Hllpp.html">•HLL vs Clearspring HLL++</a></li> |
| <li><a href="/docs/HLL/HllSketchVsDruidHyperLogLogCollector.html">•HLL Sketch vs Druid HyperLogLogCollector</a></li> |
| </div> |
| </div> |
| |
| <p id="theta-sketches"> |
| <a data-toggle="collapse" class="menu collapsed" href="#collapse_theta_sketches">Theta Sketches</a> |
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| <div class="collapse" id="collapse_theta_sketches"> |
| <li><a href="/docs/Theta/ThetaSketchFramework.html">•Theta Sketch Framework</a></li> |
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| <p id="theta-examples"> |
| <a data-toggle="collapse" class="menu collapsed" href="#collapse_theta_examples">Theta Examples</a> |
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| <div class="collapse" id="collapse_theta_examples"> |
| <li><a href="/docs/Theta/ConcurrentThetaSketch.html">•Concurrent Theta Sketch</a></li> |
| <li><a href="/docs/Theta/ThetaJavaExample.html">•Theta Sketch Java Example</a></li> |
| <li><a href="/docs/Theta/ThetaSparkExample.html">•Theta Sketch Spark Example</a></li> |
| <li><a href="/docs/Theta/ThetaPigUDFs.html">•Theta Sketch Pig UDFs</a></li> |
| <li><a href="/docs/Theta/ThetaHiveUDFs.html">•Theta Sketch Hive UDFs</a></li> |
| </div> |
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| <p id="kmv-tutorial"> |
| <a data-toggle="collapse" class="menu collapsed" href="#collapse_kmv_tutorial">KMV Tutorial</a> |
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| <div class="collapse" id="collapse_kmv_tutorial"> |
| <li><a href="/docs/Theta/InverseEstimate.html">•The Inverse Estimate</a></li> |
| <li><a href="/docs/Theta/KMVempty.html">•Empty Sketch</a></li> |
| <li><a href="/docs/Theta/KMVfirstEst.html">•First Estimator</a></li> |
| <li><a href="/docs/Theta/KMVbetterEst.html">•Better Estimator</a></li> |
| <li><a href="/docs/Theta/KMVrejection.html">•Rejection Rules</a></li> |
| <li><a href="/docs/Theta/KMVupdateVkth.html">•Update V(kth) Rule</a></li> |
| </div> |
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| <p id="set-operations-and-p-sampling"> |
| <a data-toggle="collapse" class="menu collapsed" href="#collapse_set_operations_and_p-sampling">Set Operations and P-sampling</a> |
| </p> |
| <div class="collapse" id="collapse_set_operations_and_p-sampling"> |
| <li><a href="/docs/Theta/ThetaSketchSetOps.html">•Set Operations</a></li> |
| <li><a href="/docs/Theta/ThetaSetOpsCornerCases.html">•Model & Test Set Operations</a></li> |
| <li><a href="/docs/Theta/ThetaPSampling.html">•<i>p</i>-Sampling</a></li> |
| </div> |
| |
| <p id="accuracy"> |
| <a data-toggle="collapse" class="menu collapsed" href="#collapse_accuracy">Accuracy</a> |
| </p> |
| <div class="collapse" id="collapse_accuracy"> |
| <li><a href="/docs/Theta/ThetaAccuracy.html">•Basic Accuracy</a></li> |
| <li><a href="/docs/Theta/ThetaAccuracyPlots.html">•Accuracy Plots</a></li> |
| <li><a href="/docs/Theta/ThetaErrorTable.html">•Relative Error Table</a></li> |
| <li><a href="/docs/Theta/ThetaSketchSetOpsAccuracy.html">•SetOp Accuracy</a></li> |
| <li><a href="/docs/Theta/AccuracyOfDifferentKUnions.html">•Unions With Different k</a></li> |
| </div> |
| |
| <p id="size"> |
| <a data-toggle="collapse" class="menu collapsed" href="#collapse_size">Size</a> |
| </p> |
| <div class="collapse" id="collapse_size"> |
| <li><a href="/docs/Theta/ThetaSize.html">•Theta Sketch Size</a></li> |
| </div> |
| |
| <p id="speed"> |
| <a data-toggle="collapse" class="menu collapsed" href="#collapse_speed">Speed</a> |
| </p> |
| <div class="collapse" id="collapse_speed"> |
| <li><a href="/docs/Theta/ThetaUpdateSpeed.html">•Update Speed</a></li> |
| <li><a href="/docs/Theta/ThetaMergeSpeed.html">•Merge Speed</a></li> |
| </div> |
| |
| <p id="theta-sketch-theory"> |
| <a data-toggle="collapse" class="menu collapsed" href="#collapse_theta_sketch_theory">Theta Sketch Theory</a> |
| </p> |
| <div class="collapse" id="collapse_theta_sketch_theory"> |
| <li><a href="https://github.com/apache/datasketches-website/tree/master/docs/pdf/ThetaSketchFramework.pdf">•Theta Sketch Framework (PDF)</a></li> |
| <li><a href="https://github.com/apache/datasketches-website/tree/master/docs/pdf/ThetaSketchEquations.pdf">•Theta Sketch Equations (PDF)</a></li> |
| <li><a href="https://github.com/apache/datasketches-website/tree/master/docs/pdf/DataSketches.pdf">•DataSketches (PDF)</a></li> |
| <li><a href="/docs/Theta/ThetaConfidenceIntervals.html">•Confidence Intervals Notes</a></li> |
| <li><a href="/docs/Theta/ThetaMergingAlgorithm.html">•Merging Algorithm Notes</a></li> |
| <li><a href="/docs/Theta/ThetaReferences.html">•Theta References</a></li> |
| </div> |
| </div> |
| |
| <p id="tuple-sketches"> |
| <a data-toggle="collapse" class="menu collapsed" href="#collapse_tuple_sketches">Tuple Sketches</a> |
| </p> |
| <div class="collapse" id="collapse_tuple_sketches"> |
| <li><a href="/docs/Tuple/TupleOverview.html">•Tuple Overview</a></li> |
| |
| <p id="tuple-examples"> |
| <a data-toggle="collapse" class="menu collapsed" href="#collapse_tuple_examples">Tuple Examples</a> |
| </p> |
| <div class="collapse" id="collapse_tuple_examples"> |
| <li><a href="/docs/Tuple/TupleJavaExample.html">•Tuple Java Example</a></li> |
| <li><a href="/docs/Tuple/TupleEngagementExample.html">•Tuple Engagement Example</a></li> |
| <li><a href="/docs/Tuple/TuplePigUDFs.html">•Tuple Pig UDFs</a></li> |
| <li><a href="/docs/Tuple/TupleHiveUDFs.html">•Tuple Hive UDFs</a></li> |
| </div> |
| </div> |
| </div> |
| |
| <p id="most-frequent"> |
| <a data-toggle="collapse" class="menu collapsed" href="#collapse_most_frequent">Most Frequent</a> |
| </p> |
| <div class="collapse" id="collapse_most_frequent"> |
| <li><a href="/docs/Frequency/FrequencySketchesOverview.html">•Frequency Sketches Overview</a></li> |
| |
| <p id="frequent-item-sketches"> |
| <a data-toggle="collapse" class="menu collapsed" href="#collapse_frequent_item_sketches">Frequent Item Sketches</a> |
| </p> |
| <div class="collapse" id="collapse_frequent_item_sketches"> |
| <li><a href="/docs/Frequency/FrequentItemsOverview.html">•Frequent Items Overview</a></li> |
| <li><a href="/docs/Frequency/FrequentItemsErrorTable.html">•Frequent Items Error Table</a></li> |
| <li><a href="/docs/Frequency/FrequentItemsReferences.html">•Frequent Items References</a></li> |
| <li><a href="/docs/Frequency/FrequentItemsPerformance.html">•Frequent Items Performance</a></li> |
| |
| <p id="most-frequent-examples"> |
| <a data-toggle="collapse" class="menu collapsed" href="#collapse_most_frequent_examples">Most Frequent Examples</a> |
| </p> |
| <div class="collapse" id="collapse_most_frequent_examples"> |
| <li><a href="/docs/Frequency/FrequentItemsJavaExample.html">•Frequent Items Java Example</a></li> |
| <li><a href="/docs/Frequency/FrequentItemsCppExample.html">•Frequent Items C++ Example</a></li> |
| <li><a href="/docs/Frequency/FrequentItemsPigUDFs.html">•Frequent Items Pig UDFs</a></li> |
| <li><a href="/docs/Frequency/FrequentItemsHiveUDFs.html">•Frequent Items Hive UDFs</a></li> |
| </div> |
| </div> |
| |
| <p id="frequent-distinct-sketches"> |
| <a data-toggle="collapse" class="menu collapsed" href="#collapse_frequent_distinct_sketches">Frequent Distinct Sketches</a> |
| </p> |
| <div class="collapse" id="collapse_frequent_distinct_sketches"> |
| <li><a href="/docs/Frequency/FrequentDistinctTuplesSketch.html">•Frequent Distinct Tuples Sketch</a></li> |
| </div> |
| </div> |
| |
| <p id="quantiles-and-histograms"> |
| <a data-toggle="collapse" class="menu collapsed" href="#collapse_quantiles_and_histograms">Quantiles And Histograms</a> |
| </p> |
| <div class="collapse" id="collapse_quantiles_and_histograms"> |
| <li><a href="/docs/Quantiles/SketchingQuantilesAndRanksTutorial.html">•Quantiles and Ranks Tutorial</a></li> |
| <li><a href="/docs/Quantiles/QuantilesOverview.html">•Quantiles Overview</a></li> |
| <li><a href="/docs/KLL/KLLSketch.html">•KLL Floats sketch</a></li> |
| <li><a href="/docs/KLL/KLLAccuracyAndSize.html">•KLL Sketch Accuracy and Size</a></li> |
| <li><a href="/docs/REQ/ReqSketch.html">•REQ Floats sketch</a></li> |
| <li><a href="/docs/Quantiles/OrigQuantilesSketch.html">•Original QuantilesSketch</a></li> |
| |
| <p id="quantiles-examples"> |
| <a data-toggle="collapse" class="menu collapsed" href="#collapse_quantiles_examples">Quantiles Examples</a> |
| </p> |
| <div class="collapse" id="collapse_quantiles_examples"> |
| <li><a href="/docs/Quantiles/QuantilesJavaExample.html">•Quantiles Sketch Java Example</a></li> |
| <li><a href="/docs/KLL/KLLCppExample.html">•KLL Quantiles Sketch C++ Example</a></li> |
| <li><a href="/docs/Quantiles/QuantilesPigUDFs.html">•Quantiles Sketch Pig UDFs</a></li> |
| <li><a href="/docs/Quantiles/QuantilesHiveUDFs.html">•Quantiles Sketch Hive UDFs</a></li> |
| </div> |
| |
| <p id="quantiles-studies"> |
| <a data-toggle="collapse" class="menu collapsed" href="#collapse_quantiles_studies">Quantiles Studies</a> |
| </p> |
| <div class="collapse" id="collapse_quantiles_studies"> |
| <li><a href="/docs/QuantilesStudies/DruidApproxHistogramStudy.html">•Druid Approximate Histogram</a></li> |
| <li><a href="/docs/QuantilesStudies/MomentsSketchStudy.html">•Moments Sketch Study</a></li> |
| <li><a href="/docs/QuantilesStudies/QuantilesStreamAStudy.html">•Quantiles StreamA Study</a></li> |
| <li><a href="/docs/QuantilesStudies/ExactQuantiles.html">•Exact Quantiles for Studies</a></li> |
| </div> |
| |
| <p id="quantiles-sketch-theory"> |
| <a data-toggle="collapse" class="menu collapsed" href="#collapse_quantiles_sketch_theory">Quantiles Sketch Theory</a> |
| </p> |
| <div class="collapse" id="collapse_quantiles_sketch_theory"> |
| <li><a href="https://github.com/apache/datasketches-website/tree/master/docs/pdf/Quantiles_KLL.pdf">•Optimal Quantile Approximation in Streams</a></li> |
| <li><a href="/docs/Quantiles/QuantilesReferences.html">•Quantiles References</a></li> |
| </div> |
| </div> |
| |
| <p id="sampling"> |
| <a data-toggle="collapse" class="menu collapsed" href="#collapse_sampling">Sampling</a> |
| </p> |
| <div class="collapse" id="collapse_sampling"> |
| <li><a href="/docs/Sampling/ReservoirSampling.html">•Reservoir Sampling</a></li> |
| <li><a href="/docs/Sampling/ReservoirSamplingPerformance.html">•Reservoir Sampling Performance</a></li> |
| <li><a href="/docs/Sampling/VarOptSampling.html">•VarOpt Sampling</a></li> |
| |
| <p id="sampling-examples"> |
| <a data-toggle="collapse" class="menu collapsed" href="#collapse_sampling_examples">Sampling Examples</a> |
| </p> |
| <div class="collapse" id="collapse_sampling_examples"> |
| <li><a href="/docs/Sampling/ReservoirSamplingJava.html">•Reservoir Sampling Java Example</a></li> |
| <li><a href="/docs/Sampling/ReservoirSamplingPigUDFs.html">•Reservoir Sampling Pig UDFs</a></li> |
| <li><a href="/docs/Sampling/VarOptSamplingJava.html">•VarOpt Sampling Java Example</a></li> |
| <li><a href="/docs/Sampling/VarOptPigUDFs.html">•VarOpt Sampling Pig UDFs</a></li> |
| </div> |
| </div> |
| </div> |
| |
| <p id="system-integrations"> |
| <a data-toggle="collapse" class="menu collapsed" href="#collapse_system_integrations">System Integrations</a> |
| </p> |
| <div class="collapse" id="collapse_system_integrations"> |
| <li><a href="/docs/SystemIntegrations/ApacheDruidIntegration.html">•Using Sketches in ApacheDruid</a></li> |
| <li><a href="/docs/SystemIntegrations/ApacheHiveIntegration.html">•Using Sketches in Apache Hive</a></li> |
| <li><a href="/docs/SystemIntegrations/ApachePigIntegration.html">•Using Sketches in Apache Pig</a></li> |
| <li><a href="/docs/SystemIntegrations/PostgreSQLIntegration.html">•Using Sketches in PostgreSQL</a></li> |
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| <li><a href="/docs/Community/ReleaseProcessForCppComponents.html">•Release Process For CPP Components</a></li> |
| <li><a href="/docs/Community/ReleaseProcessForJavaComponents.html">•Release Process For Java Components</a></li> |
| <li><a href="/docs/Community/Transitioning.html">•Transitioning from prior GitHub Site</a></li> |
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| <p id="research"> |
| <a data-toggle="collapse" class="menu collapsed" href="#collapse_research">Research</a> |
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| <h1 id="sketches-by-component-repository">Sketches by <a href="https://github.com/apache?utf8=%E2%9C%93&q=datasketches">Component Repository</a></h1> |
| |
| <p>The DataSketches Library is organized into the following repository groups:</p> |
| |
| <h2 id="java">Java</h2> |
| |
| <h3 id="datasketches-java">datasketches-java</h3> |
| <p>This repository has the core-java sketching classes, which are leveraged by some of the other repositories. <br /> |
| This repository has no external dependencies outside of the DataSketches/memory repository, Java and TestNG for unit tests. |
| This code is versioned and the latest release can be obtained from |
| <a href="https://datasketches.apache.org/docs/Community/Downloads.html">Downloads</a>.</p> |
| |
| <p><b>High-level Repositories Structure</b></p> |
| |
| <table> |
| <thead> |
| <tr> |
| <th>Sketches-core Packages.</th> |
| <th>Package Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td>org.apache.datasketches</td> |
| <td>Common functions and utilities</td> |
| </tr> |
| <tr> |
| <td>org.apache.datasketches.cpc</td> |
| <td>New Unique Counting Sketch with better accuracy per size than HLL</td> |
| </tr> |
| <tr> |
| <td>org.apache.datasketches.fdt</td> |
| <td>Frequent Distinct Tuples Sketch.</td> |
| </tr> |
| <tr> |
| <td>org.apache.datasketches.frequencies</td> |
| <td>Frequent Item Sketches, for both longs and generics</td> |
| </tr> |
| <tr> |
| <td>org.apache.datasketches.hash</td> |
| <td>The 128-bit MurmurHash3 and adaptors</td> |
| </tr> |
| <tr> |
| <td>org.apache.datasketches.hll</td> |
| <td>Unique counting HLL sketches for both heap and off-heap.</td> |
| </tr> |
| <tr> |
| <td>org.apache.datasketches.hllmap</td> |
| <td>The (HLL) Unique Count Map Sketch</td> |
| </tr> |
| <tr> |
| <td>org.apache.datasketches.kll</td> |
| <td>Quantiles sketch with better accuracy per size than the standard quantiles sketch. Includes PMF, CDF functions, for floats, doubles. On-heap & off-heap.</td> |
| </tr> |
| <tr> |
| <td>org.apache.datasketches.quantiles</td> |
| <td>Standard Quantiles sketch, plus PMF and CDF functions, for doubles and generics. On-heap & off-heap.</td> |
| </tr> |
| <tr> |
| <td>org.apache.datasketches.req</td> |
| <td>Relative Error Quantiles (REQ) sketch, plus PMF and CDF functions for floats, on-heap. Extremely high accuracy for very high ranks (e.g., 99.999%ile), or very low ranks (e.g., .00001%ile.</td> |
| </tr> |
| <tr> |
| <td>org.apache.datasketches.sampling</td> |
| <td>Weighted and uniform reservoir sampling with generics</td> |
| </tr> |
| <tr> |
| <td>org.apache.datasketches.theta</td> |
| <td>Unique counting Theta Sketches for both on-heap & off-heap</td> |
| </tr> |
| <tr> |
| <td>org.apache.datasketches.tuple</td> |
| <td>Tuple sketches for both primitives and generics</td> |
| </tr> |
| <tr> |
| <td>org.apache.datasketches.tuple.adouble</td> |
| <td>A Tuple sketch with a Summary of a single double</td> |
| </tr> |
| <tr> |
| <td>org.apache.datasketches.tuple.aninteger</td> |
| <td>A Tuple sketch with a Summary of a single integer</td> |
| </tr> |
| <tr> |
| <td>org.apache.datasketches.tuple.Strings</td> |
| <td>A Tuple sketch with a Summary of an array of Strings</td> |
| </tr> |
| </tbody> |
| </table> |
| |
| <h3 id="datasketches-memory">datasketches-memory</h3> |
| <p>This code is versioned and the latest release can be obtained from |
| <a href="https://datasketches.apache.org/docs/Community/Downloads.html">Downloads</a>.</p> |
| |
| <table> |
| <thead> |
| <tr> |
| <th>Memory Packages</th> |
| <th>Package Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td>org.apache.datasketches.memory</td> |
| <td>Low level, high-performance Memory data-structure management primarily for off-heap.</td> |
| </tr> |
| </tbody> |
| </table> |
| |
| <h3 id="datasketches-hive">datasketches-hive</h3> |
| <p>This repository contains Hive UDFs and UDAFs for use within Hadoop grid enviornments. |
| This code has dependencies on sketches-core as well as Hadoop and Hive. |
| Users of this code are advised to use Maven to bring in all the required dependencies. |
| This code is versioned and the latest release can be obtained from |
| <a href="https://datasketches.apache.org/docs/Community/Downloads.html">Downloads</a>.</p> |
| |
| <table> |
| <thead> |
| <tr> |
| <th>Sketches-hive Packages</th> |
| <th>Package Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td>org.apache.datasketches.hive.cpc</td> |
| <td>Hive UDF and UDAFs for CPC sketches</td> |
| </tr> |
| <tr> |
| <td>org.apache.datasketches.hive.frequencies</td> |
| <td>Hive UDF and UDAFs for Frequent Items sketches</td> |
| </tr> |
| <tr> |
| <td>org.apache.datasketches.hive.hll</td> |
| <td>Hive UDF and UDAFs for HLL sketches</td> |
| </tr> |
| <tr> |
| <td>org.apache.datasketches.hive.kll</td> |
| <td>Hive UDF and UDAFs for KLL sketches</td> |
| </tr> |
| <tr> |
| <td>org.apache.datasketches.hive.quantiles</td> |
| <td>Hive UDF and UDAFs for Quantiles sketches</td> |
| </tr> |
| <tr> |
| <td>org.apache.datasketches.hive.theta</td> |
| <td>Hive UDF and UDAFs for Theta sketches</td> |
| </tr> |
| <tr> |
| <td>org.apache.datasketches.hive.tuple</td> |
| <td>Hive UDF and UDAFs for Tuple sketches</td> |
| </tr> |
| </tbody> |
| </table> |
| |
| <h3 id="datasketches-pig">datasketches-pig</h3> |
| <p>This repository contains Pig User Defined Functions (UDF) for use within Hadoop grid environments. |
| This code has dependencies on sketches-core as well as Hadoop and Pig. |
| Users of this code are advised to use Maven to bring in all the required dependencies. |
| This code is versioned and the latest release can be obtained from |
| <a href="https://datasketches.apache.org/docs/Community/Downloads.html">Downloads</a>.</p> |
| |
| <table> |
| <thead> |
| <tr> |
| <th>Sketches-pig Packages</th> |
| <th>Package Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td>org.apache.datasketches.pig.cpc</td> |
| <td>Pig UDFs for CPC sketches</td> |
| </tr> |
| <tr> |
| <td>org.apache.datasketches.pig.frequencies</td> |
| <td>Pig UDFs for Frequent Items sketches</td> |
| </tr> |
| <tr> |
| <td>org.apache.datasketches.pig.hash</td> |
| <td>Pig UDFs for MurmerHash3</td> |
| </tr> |
| <tr> |
| <td>org.apache.datasketches.pig.hll</td> |
| <td>Pig UDFs for HLL sketches</td> |
| </tr> |
| <tr> |
| <td>org.apache.datasketches.pig.kll</td> |
| <td>Pig UDFs for KLL sketches</td> |
| </tr> |
| <tr> |
| <td>org.apache.datasketches.pig.quantiles</td> |
| <td>Pig UDFs for Quantiles sketches</td> |
| </tr> |
| <tr> |
| <td>org.apache.datasketches.pig.sampling.</td> |
| <td>Pig UDFs for Sampling sketches</td> |
| </tr> |
| <tr> |
| <td>org.apache.datasketches.pig.theta</td> |
| <td>Pig UDFs for Theta sketches</td> |
| </tr> |
| <tr> |
| <td>org.apache.datasketches.pig.tuple</td> |
| <td>Pig UDFs for Tuple sketches</td> |
| </tr> |
| </tbody> |
| </table> |
| |
| <h3 id="datasketches-characterization">datasketches-characterization</h3> |
| <p>This relatively new repository is for Java and C++ code that we use to characterize the accuracy and speed performance of the sketches in |
| the library and is constantly being updated. Examples of the job command files used for various tests can be found in the src/main/resources directory. |
| Some of these tests can run for hours depending on its configuration. This component is not formally released and code must be obtained from |
| the <a href="https://github.com/apache/datasketches-characterization">GitHub site</a>.</p> |
| |
| <table> |
| <thead> |
| <tr> |
| <th>Characterization Packages</th> |
| <th>Package Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td>org.apache.datasketches.characterization</td> |
| <td>Common functions and utilities</td> |
| </tr> |
| <tr> |
| <td>org.apache.datasketches.characterization.concurrent</td> |
| <td>Concurrent Theta Sketch</td> |
| </tr> |
| <tr> |
| <td>org.apache.datasketches.characterization.cpc</td> |
| <td>Compressed Probabilistic Counting Sketch</td> |
| </tr> |
| <tr> |
| <td>org.apache.datasketches.characterization.fdt</td> |
| <td>Frequent Distinct Tuples Sketch</td> |
| </tr> |
| <tr> |
| <td>org.apache.datasketches.characterization.frequencies</td> |
| <td>Frequent Items Sketches</td> |
| </tr> |
| <tr> |
| <td>org.apache.datasketches.characterization.hash</td> |
| <td>Hash function performance</td> |
| </tr> |
| <tr> |
| <td>org.apache.datasketches.characterization.hll</td> |
| <td>HyperLogLog Sketcch</td> |
| </tr> |
| <tr> |
| <td>org.apache.datasketches.characterization.memory</td> |
| <td>Memory performance</td> |
| </tr> |
| <tr> |
| <td>org.apache.datasketches.characterization.quantiles</td> |
| <td>Quantiles performance</td> |
| </tr> |
| <tr> |
| <td>org.apache.datasketches.characterization.theta</td> |
| <td>Theta Sketch</td> |
| </tr> |
| <tr> |
| <td>org.apache.datasketches.characterization.uniquecount</td> |
| <td>Base Profiles for Unique Counting Sketches</td> |
| </tr> |
| </tbody> |
| </table> |
| |
| <h3 id="datasketches-server">datasketches-server</h3> |
| <p>This is a new repository for our experimental docker/container server that enables easy access to the core sketches in the library via HTTP. |
| This component is not formally released and code must be obtained from |
| the <a href="https://github.com/apache/datasketches-server">GitHub site</a>.</p> |
| |
| <h4 id="c-characterizations">C++ Characterizations</h4> |
| <ul> |
| <li>CPC</li> |
| <li>Frequent Items</li> |
| <li>HLL</li> |
| <li>KLL</li> |
| <li>Theta</li> |
| </ul> |
| |
| <h3 id="datasketches-vector">datasketches-vector</h3> |
| <p>This component implements the <a href="/docs/Community/Research.html">Frequent Directions Algorithm</a> [GLP16]. It is still experimental in that the theoretical work has not yet supplied a suitable measure of error for production work. It can be used as is, but it will not go through a formal Apache Release until we can find a way to provide better error properties. It has a dependence on the Memory component. |
| This component is not formally released and code must be obtained from |
| the <a href="https://github.com/apache/datasketches-vector">GitHub site</a>.</p> |
| |
| <h2 id="c-and-python">C++ and Python</h2> |
| |
| <h3 id="datasketches-cpp">datasketches-cpp</h3> |
| <p>This is the evolving C++ implementations of the same sketches that are available in Java. |
| These implementations are <em>binary compatible</em> with their counterparts in Java. |
| In other words, a sketch created and stored in C++ can be opened and read in Java and visa-versa. |
| This code is versioned and the latest release can be obtained from |
| <a href="https://datasketches.apache.org/docs/Community/Downloads.html">Downloads</a>.</p> |
| |
| <p>This site also has our <a href="https://github.com/apache/datasketches-cpp/tree/master/python">Python adaptors</a> that basically wrap the C++ implementations, making the high performance C++ implementations available from Python.</p> |
| |
| <h3 id="datasketches-postgresql">datasketches-postgresql</h3> |
| <p>This site provides the postgres-specific adaptors that wrap the C++ implementations making |
| them available to the PostgreSQL database users. PostgreSQL users should download the PostgreSQL extension from <a href="https://pgxn.org/dist/datasketches/">pgxn.org</a>. For examples refer to the README on the component site. This code is versioned and the latest release can be obtained from |
| <a href="https://datasketches.apache.org/docs/Community/Downloads.html">Downloads</a>.</p> |
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