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| <div class="subTitle">com.yahoo.sketches.hllmap</div> |
| <h2 title="Class UniqueCountMap" class="title">Class UniqueCountMap</h2> |
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| <li>com.yahoo.sketches.hllmap.UniqueCountMap</li> |
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| <pre>public class <span class="typeNameLabel">UniqueCountMap</span> |
| extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></pre> |
| <div class="block">This is a real-time, key-value HLL mapping sketch that tracks approximate unique counts of |
| identifiers (the values) associated with each key. An example might be tracking the number of |
| unique user identifiers associated with each IP address. This map has been specifically designed |
| for the use-case where the number of keys is quite large (many millions) and the distribution of |
| identifiers per key is very skewed. A typical distribution where this works well is a |
| power-law distribution of identifiers per key of the form <i>y = Cx<sup>-α</sup></i>, |
| where <i>α</i> < 0.5, and <i>C</i> is roughly <i>y<sub>max</sub></i>. |
| For example, with 100M keys, over 75% of the keys would have only |
| one identifier, 99% of the keys would have less than 20 identifiers, 99.9% would have less than |
| 200 identifiers, and a very tiny fraction might have identifiers in the thousands. |
| |
| <p>The space consumed by this map is quite sensitive to the actual distribution of identifiers |
| per key, so you should characterize and or experiment with your typical input streams. |
| Nonetheless, our experiments on live streams of over 100M keys required about 1.4GB of space. |
| |
| <p>Given such highly-skewed distributions, using this map is far more efficient space-wise than |
| the alternative of dedicating an HLL sketch per key. Based on our use cases, after |
| subtracting the space required for key storage, the average bytes per key required for unique |
| count estimation (<a href="../../../../com/yahoo/sketches/hllmap/UniqueCountMap.html#getAverageSketchMemoryPerKey--"><code>getAverageSketchMemoryPerKey()</code></a>) is about 10. |
| |
| <p>Internally, this map is implemented as a hierarchy of internal hash maps with progressively |
| increasing storage allocated for unique count estimation. As a key acquires more identifiers it |
| is "promoted" up to a higher internal map. The final map of keys is a map of compact HLL |
| sketches. |
| |
| <p>The unique values in all the internal maps, except the final HLL map, are stored in a special |
| form called a coupon. A coupon is a 16-bit value that fully describes a k=1024 HLL bin. |
| It contains 10 bits of address and a 6-bit HLL value. |
| |
| <p>All internal maps use a prime number size and Knuth's Open Addressing Double Hash (OADH) |
| search algorithm. |
| |
| <p>The internal base map holds all the keys and each key is associated with one 16-bit value. |
| Initially, the value is a single coupon. Once the key is promoted, this 16-bit field contains a |
| reference to the internal map where the key is still active. |
| |
| <p>The intermediate maps between the base map and the final HLL map are of two types. |
| The first few of these are called traverse maps where the coupons are |
| stored as unsorted arrays. After the traverse maps are the coupon hash maps, where the coupons |
| are stored in small OASH hash tables. |
| |
| <p>All the intermediate maps support deletes and can dynamically grow and shrink as required by |
| the input stream. |
| |
| <p>The sketch estimator algorithms are unbiased with a Relative Standard Error (RSE) |
| of about 2.6% with 68% confidence, or equivalently, about 5.2% with a 95% confidence. |
| |
| <p>In a parallel package in the sketches-misc repository, there are 2 classes that can be used |
| from the command line to feed this mapping sketch piped from standard-in for experimental |
| evaluation. The first is ProcessIpStream, which processes simple IP/ID pairs and the second, |
| ProcessDistributionStream, which processes pairs that describe a distribution. |
| In this same package is the VariousMapRSETest class that was used to generate the error plots |
| for the web site. Please refer to the javadocs for those classes for more information.</div> |
| <dl> |
| <dt><span class="simpleTagLabel">Author:</span></dt> |
| <dd>Lee Rhodes, Alexander Saydakov, Kevin Lang</dd> |
| </dl> |
| </li> |
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| <th class="colOne" scope="col">Constructor and Description</th> |
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| <tr class="altColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../com/yahoo/sketches/hllmap/UniqueCountMap.html#UniqueCountMap-int-">UniqueCountMap</a></span>(int keySizeBytes)</code> |
| <div class="block">Constructs a UniqueCountMap with an initial capacity of one million entries.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../com/yahoo/sketches/hllmap/UniqueCountMap.html#UniqueCountMap-int-int-">UniqueCountMap</a></span>(int initialNumEntries, |
| int keySizeBytes)</code> |
| <div class="block">Constructs a UniqueCountMap with a given initial number of entries.</div> |
| </td> |
| </tr> |
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| <caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd"> </span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd"> </span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd"> </span></span></caption> |
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| <td class="colFirst"><code>int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../com/yahoo/sketches/hllmap/UniqueCountMap.html#getActiveEntries--">getActiveEntries</a></span>()</code> |
| <div class="block">Returns the number of active, unique keys across all internal maps</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>double</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../com/yahoo/sketches/hllmap/UniqueCountMap.html#getAverageSketchMemoryPerKey--">getAverageSketchMemoryPerKey</a></span>()</code> |
| <div class="block">Returns the average memory storage per key that is dedicated to sketching the unique counts.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>double</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../com/yahoo/sketches/hllmap/UniqueCountMap.html#getEstimate-byte:A-">getEstimate</a></span>(byte[] key)</code> |
| <div class="block">Retrieves the current estimate of unique count for a given key.</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>long</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../com/yahoo/sketches/hllmap/UniqueCountMap.html#getKeyMemoryUsageBytes--">getKeyMemoryUsageBytes</a></span>()</code> |
| <div class="block">Returns total bytes used for key storage</div> |
| </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>double</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../com/yahoo/sketches/hllmap/UniqueCountMap.html#getLowerBound-byte:A-">getLowerBound</a></span>(byte[] key)</code> |
| <div class="block">Returns the lower bound cardinality with respect to <a href="../../../../com/yahoo/sketches/hllmap/UniqueCountMap.html#getEstimate-byte:A-"><code>getEstimate(byte[])</code></a> associated |
| with the given key.</div> |
| </td> |
| </tr> |
| <tr id="i5" class="rowColor"> |
| <td class="colFirst"><code>long</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../com/yahoo/sketches/hllmap/UniqueCountMap.html#getMemoryUsageBytes--">getMemoryUsageBytes</a></span>()</code> |
| <div class="block">Returns total bytes used by all internal maps</div> |
| </td> |
| </tr> |
| <tr id="i6" class="altColor"> |
| <td class="colFirst"><code>double</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../com/yahoo/sketches/hllmap/UniqueCountMap.html#getUpperBound-byte:A-">getUpperBound</a></span>(byte[] key)</code> |
| <div class="block">Returns the upper bound cardinality with respect to <a href="../../../../com/yahoo/sketches/hllmap/UniqueCountMap.html#getEstimate-byte:A-"><code>getEstimate(byte[])</code></a> associated |
| with the given key.</div> |
| </td> |
| </tr> |
| <tr id="i7" class="rowColor"> |
| <td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../com/yahoo/sketches/hllmap/UniqueCountMap.html#toString--">toString</a></span>()</code> |
| <div class="block">Returns a string with a human-readable summary of the UniqueCountMap and all the internal maps</div> |
| </td> |
| </tr> |
| <tr id="i8" class="altColor"> |
| <td class="colFirst"><code>double</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../com/yahoo/sketches/hllmap/UniqueCountMap.html#update-byte:A-byte:A-">update</a></span>(byte[] key, |
| byte[] identifier)</code> |
| <div class="block">Updates the map with a given key and identifier and returns the estimate of the number of |
| unique identifiers encountered so far for the given key.</div> |
| </td> |
| </tr> |
| </table> |
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| <code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#clone--" title="class or interface in java.lang">clone</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#equals-java.lang.Object-" title="class or interface in java.lang">equals</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#finalize--" title="class or interface in java.lang">finalize</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#getClass--" title="class or interface in java.lang">getClass</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#hashCode--" title="class or interface in java.lang">hashCode</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notify--" title="class or interface in java.lang">notify</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notifyAll--" title="class or interface in java.lang">notifyAll</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait--" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-int-" title="class or interface in java.lang">wait</a></code></li> |
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| <h4>UniqueCountMap</h4> |
| <pre>public UniqueCountMap(int keySizeBytes)</pre> |
| <div class="block">Constructs a UniqueCountMap with an initial capacity of one million entries.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>keySizeBytes</code> - must be at least 4 bytes to have sufficient entropy.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="UniqueCountMap-int-int-"> |
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| <h4>UniqueCountMap</h4> |
| <pre>public UniqueCountMap(int initialNumEntries, |
| int keySizeBytes)</pre> |
| <div class="block">Constructs a UniqueCountMap with a given initial number of entries.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>initialNumEntries</code> - The initial number of entries provides a tradeoff between |
| wasted space, if too high, and wasted time resizing the table, if too low.</dd> |
| <dd><code>keySizeBytes</code> - must be at least 4 bytes to have sufficient entropy</dd> |
| </dl> |
| </li> |
| </ul> |
| </li> |
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| <h4>update</h4> |
| <pre>public double update(byte[] key, |
| byte[] identifier)</pre> |
| <div class="block">Updates the map with a given key and identifier and returns the estimate of the number of |
| unique identifiers encountered so far for the given key.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>key</code> - the given key</dd> |
| <dd><code>identifier</code> - the given identifier for unique counting associated with the key</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the estimate of the number of unique identifiers encountered so far for the given key.</dd> |
| </dl> |
| </li> |
| </ul> |
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| <h4>getEstimate</h4> |
| <pre>public double getEstimate(byte[] key)</pre> |
| <div class="block">Retrieves the current estimate of unique count for a given key.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>key</code> - given key</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>estimate of unique count so far</dd> |
| </dl> |
| </li> |
| </ul> |
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| </a> |
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| <h4>getUpperBound</h4> |
| <pre>public double getUpperBound(byte[] key)</pre> |
| <div class="block">Returns the upper bound cardinality with respect to <a href="../../../../com/yahoo/sketches/hllmap/UniqueCountMap.html#getEstimate-byte:A-"><code>getEstimate(byte[])</code></a> associated |
| with the given key.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>key</code> - the given key</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the upper bound cardinality with respect to <a href="../../../../com/yahoo/sketches/hllmap/UniqueCountMap.html#getEstimate-byte:A-"><code>getEstimate(byte[])</code></a> associated |
| with the given key.</dd> |
| </dl> |
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| </a> |
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| <h4>getLowerBound</h4> |
| <pre>public double getLowerBound(byte[] key)</pre> |
| <div class="block">Returns the lower bound cardinality with respect to <a href="../../../../com/yahoo/sketches/hllmap/UniqueCountMap.html#getEstimate-byte:A-"><code>getEstimate(byte[])</code></a> associated |
| with the given key.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>key</code> - the given key</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the lower bound cardinality with respect to <a href="../../../../com/yahoo/sketches/hllmap/UniqueCountMap.html#getEstimate-byte:A-"><code>getEstimate(byte[])</code></a> associated |
| with the given key.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="getActiveEntries--"> |
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| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>getActiveEntries</h4> |
| <pre>public int getActiveEntries()</pre> |
| <div class="block">Returns the number of active, unique keys across all internal maps</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the number of active, unique keys across all internal maps</dd> |
| </dl> |
| </li> |
| </ul> |
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| </a> |
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| <h4>getMemoryUsageBytes</h4> |
| <pre>public long getMemoryUsageBytes()</pre> |
| <div class="block">Returns total bytes used by all internal maps</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>total bytes used by all internal maps</dd> |
| </dl> |
| </li> |
| </ul> |
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| <h4>getKeyMemoryUsageBytes</h4> |
| <pre>public long getKeyMemoryUsageBytes()</pre> |
| <div class="block">Returns total bytes used for key storage</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>total bytes used for key storage</dd> |
| </dl> |
| </li> |
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| <h4>getAverageSketchMemoryPerKey</h4> |
| <pre>public double getAverageSketchMemoryPerKey()</pre> |
| <div class="block">Returns the average memory storage per key that is dedicated to sketching the unique counts.</div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the average memory storage per key that is dedicated to sketching the unique counts.</dd> |
| </dl> |
| </li> |
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| <h4>toString</h4> |
| <pre>public <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> toString()</pre> |
| <div class="block">Returns a string with a human-readable summary of the UniqueCountMap and all the internal maps</div> |
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| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#toString--" title="class or interface in java.lang">toString</a></code> in class <code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></code></dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>human-readable summary</dd> |
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