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| <h1 title="Package" class="title">Package org.apache.datasketches.hll</h1> |
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| <div class="block">The hll package contains a high performance implementation of Phillipe |
| Flajolet's HLL sketch with significantly improved error behavior.</div> |
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| <td class="colFirst"><a href="../../../../org/apache/datasketches/hll/HllSketch.html" title="class in org.apache.datasketches.hll">HllSketch</a></td> |
| <td class="colLast"> |
| <div class="block">This is a high performance implementation of Phillipe Flajolet’s HLL sketch but with |
| significantly improved error behavior.</div> |
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| <td class="colFirst"><a href="../../../../org/apache/datasketches/hll/IntMemoryPairIterator.html" title="class in org.apache.datasketches.hll">IntMemoryPairIterator</a></td> |
| <td class="colLast"> |
| <div class="block">Iterates within a given Memory extracting integer pairs.</div> |
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| <td class="colFirst"><a href="../../../../org/apache/datasketches/hll/Union.html" title="class in org.apache.datasketches.hll">Union</a></td> |
| <td class="colLast"> |
| <div class="block">This performs union operations for all HllSketches.</div> |
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| <td class="colFirst"><a href="../../../../org/apache/datasketches/hll/TgtHllType.html" title="enum in org.apache.datasketches.hll">TgtHllType</a></td> |
| <td class="colLast"> |
| <div class="block">Specifies the target type of HLL sketch to be created.</div> |
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| <h2 title="Package org.apache.datasketches.hll Description">Package org.apache.datasketches.hll Description</h2> |
| <div class="block">The hll package contains a high performance implementation of Phillipe |
| Flajolet's HLL sketch with significantly improved error behavior. |
| |
| <p>If the ONLY use case for sketching is counting uniques and merging, the |
| HLL sketch is the highest performing in terms of accuracy for space |
| consumed. For large counts, this HLL version will be 2 to 16 times |
| smaller for the same accuracy than the Theta Sketches. |
| |
| <p>HLL sketches do not retain any of the hash values of the associated unique identifiers, |
| so if there is any anticipation of a future need to leverage associations with these |
| retained hash values, Theta Sketches would be a better choice.</p> |
| |
| <p>HLL sketches cannot be intermixed or merged in any way with Theta Sketches. |
| </p></div> |
| <dl> |
| <dt><span class="simpleTagLabel">Author:</span></dt> |
| <dd>Lee Rhodes, Kevin Lang</dd> |
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