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| <div class="subTitle">org.apache.kudu.util</div> |
| <h2 title="Class BloomFilter" class="title">Class BloomFilter</h2> |
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| <ul class="inheritance"> |
| <li>org.apache.kudu.util.BloomFilter</li> |
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| <pre>@InterfaceAudience.Public |
| @InterfaceStability.Unstable |
| <a href="https://docs.oracle.com/javase/8/docs/api/javax/annotation/concurrent.NotThreadSafe.html?is-external=true" title="class or interface in javax.annotation">@NotThreadSafe</a> |
| public class <span class="typeNameLabel">BloomFilter</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">An space-efficient filter which offers an approximate containment check. |
| |
| <p>It can be used to filter all the records which are wanted, but doesn't guarantee to filter out |
| all the records which are <i>not</i> wanted. |
| |
| <p>Please check this <a |
| href="https://en.wikipedia.org/wiki/Bloom_filter">wiki</a> for more details. |
| |
| <p>The <code>BloomFilter</code> here is a scanning filter and used to constrain the number of records |
| returned from TServer. It provides different types of <code>put</code> methods. When you <code>put</code> a |
| record into <code>BloomFilter</code>, it means you expect the TServer to return records with |
| the same value in a scan. |
| |
| <p>Here is an example for use: |
| <pre> |
| <code> |
| BloomFilter bf = BloomFilter.BySizeAndFPRate(nBytes); |
| bf.put(1); |
| bf.put(3); |
| bf.put(4); |
| byte[] bitSet = bf.getBitSet(); |
| byte[] nHashes = bf.getNHashes(); |
| String hashFunctionName = bf.getHashFunctionName(); |
| // TODO: implement the interface for serializing and sending |
| // (bitSet, nHashes, hashFunctionName) to TServer. |
| </code> |
| </pre></div> |
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| <h3>Method Summary</h3> |
| <table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Method Summary table, listing methods, and an explanation"> |
| <caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd"> </span></span><span id="t1" class="tableTab"><span><a href="javascript:show(1);">Static Methods</a></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> |
| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Method and Description</th> |
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| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code>static <a href="../../../../org/apache/kudu/util/BloomFilter.html" title="class in org.apache.kudu.util">BloomFilter</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/kudu/util/BloomFilter.html#byCount-int-">byCount</a></span>(int expectedCount)</code> |
| <div class="block">Generate bloom filter, default hashing is <code>Murmur2</code> and false positive rate is 0.01.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>static <a href="../../../../org/apache/kudu/util/BloomFilter.html" title="class in org.apache.kudu.util">BloomFilter</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/kudu/util/BloomFilter.html#byCountAndFPRate-int-double-">byCountAndFPRate</a></span>(int expectedCount, |
| double fpRate)</code> |
| <div class="block">Generate bloom filter, default hashing is <code>Murmur2</code>.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>static <a href="../../../../org/apache/kudu/util/BloomFilter.html" title="class in org.apache.kudu.util">BloomFilter</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/kudu/util/BloomFilter.html#byCountAndFPRate-int-double-org.apache.kudu.util.BloomFilter.HashFunction-">byCountAndFPRate</a></span>(int expectedCount, |
| double fpRate, |
| org.apache.kudu.util.BloomFilter.HashFunction hashFunction)</code> |
| <div class="block">Generate bloom filter.</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>static <a href="../../../../org/apache/kudu/util/BloomFilter.html" title="class in org.apache.kudu.util">BloomFilter</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/kudu/util/BloomFilter.html#bySize-int-">bySize</a></span>(int nBytes)</code> |
| <div class="block">Generate bloom filter, default hashing is <code>Murmur2</code> and false positive rate is 0.01.</div> |
| </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>static <a href="../../../../org/apache/kudu/util/BloomFilter.html" title="class in org.apache.kudu.util">BloomFilter</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/kudu/util/BloomFilter.html#bySizeAndFPRate-int-double-">bySizeAndFPRate</a></span>(int nBytes, |
| double fpRate)</code> |
| <div class="block">Generate bloom filter, default hashing is <code>Murmur2</code>.</div> |
| </td> |
| </tr> |
| <tr id="i5" class="rowColor"> |
| <td class="colFirst"><code>static <a href="../../../../org/apache/kudu/util/BloomFilter.html" title="class in org.apache.kudu.util">BloomFilter</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/kudu/util/BloomFilter.html#bySizeAndFPRate-int-double-org.apache.kudu.util.BloomFilter.HashFunction-">bySizeAndFPRate</a></span>(int nBytes, |
| double fpRate, |
| org.apache.kudu.util.BloomFilter.HashFunction hashFunction)</code> |
| <div class="block">Generate bloom filter.</div> |
| </td> |
| </tr> |
| <tr id="i6" class="altColor"> |
| <td class="colFirst"><code>byte[]</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/kudu/util/BloomFilter.html#getBitSet--">getBitSet</a></span>()</code> |
| <div class="block">Get the internal bit set in bytes.</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="../../../../org/apache/kudu/util/BloomFilter.html#getHashFunctionName--">getHashFunctionName</a></span>()</code> |
| <div class="block">Get the name of hashing used when updating or checking containment.</div> |
| </td> |
| </tr> |
| <tr id="i8" class="altColor"> |
| <td class="colFirst"><code>int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/kudu/util/BloomFilter.html#getNHashes--">getNHashes</a></span>()</code> |
| <div class="block">Get the number of hashing times when updating or checking containment.</div> |
| </td> |
| </tr> |
| <tr id="i9" class="rowColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/kudu/util/BloomFilter.html#put-boolean-">put</a></span>(boolean data)</code> |
| <div class="block">Update bloom filter with a <code>boolean</code>.</div> |
| </td> |
| </tr> |
| <tr id="i10" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/kudu/util/BloomFilter.html#put-byte-">put</a></span>(byte data)</code> |
| <div class="block">Update bloom filter with a <code>byte</code>.</div> |
| </td> |
| </tr> |
| <tr id="i11" class="rowColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/kudu/util/BloomFilter.html#put-byte:A-">put</a></span>(byte[] data)</code> |
| <div class="block">Update bloom filter with a <code>byte[]</code>.</div> |
| </td> |
| </tr> |
| <tr id="i12" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/kudu/util/BloomFilter.html#put-double-">put</a></span>(double data)</code> |
| <div class="block">Update bloom filter with a <code>double</code>.</div> |
| </td> |
| </tr> |
| <tr id="i13" class="rowColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/kudu/util/BloomFilter.html#put-float-">put</a></span>(float data)</code> |
| <div class="block">Update bloom filter with a <code>float</code>.</div> |
| </td> |
| </tr> |
| <tr id="i14" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/kudu/util/BloomFilter.html#put-int-">put</a></span>(int data)</code> |
| <div class="block">Update bloom filter with a <code>int</code>.</div> |
| </td> |
| </tr> |
| <tr id="i15" class="rowColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/kudu/util/BloomFilter.html#put-long-">put</a></span>(long data)</code> |
| <div class="block">Update bloom filter with a <code>long</code>.</div> |
| </td> |
| </tr> |
| <tr id="i16" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/kudu/util/BloomFilter.html#put-short-">put</a></span>(short data)</code> |
| <div class="block">Update bloom filter with a <code>short</code>.</div> |
| </td> |
| </tr> |
| <tr id="i17" class="rowColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/kudu/util/BloomFilter.html#put-java.lang.String-">put</a></span>(<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> data)</code> |
| <div class="block">Update bloom filter with a <code>String</code>.</div> |
| </td> |
| </tr> |
| <tr id="i18" class="altColor"> |
| <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="../../../../org/apache/kudu/util/BloomFilter.html#toString--">toString</a></span>()</code> </td> |
| </tr> |
| </table> |
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| <h3>Methods inherited from class java.lang.<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></h3> |
| <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> |
| </ul> |
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| <h4>bySize</h4> |
| <pre>public static <a href="../../../../org/apache/kudu/util/BloomFilter.html" title="class in org.apache.kudu.util">BloomFilter</a> bySize(int nBytes)</pre> |
| <div class="block">Generate bloom filter, default hashing is <code>Murmur2</code> and false positive rate is 0.01.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>nBytes</code> - size of bloom filter in bytes</dd> |
| </dl> |
| </li> |
| </ul> |
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| <h4>bySizeAndFPRate</h4> |
| <pre>public static <a href="../../../../org/apache/kudu/util/BloomFilter.html" title="class in org.apache.kudu.util">BloomFilter</a> bySizeAndFPRate(int nBytes, |
| double fpRate)</pre> |
| <div class="block">Generate bloom filter, default hashing is <code>Murmur2</code>.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>nBytes</code> - size of bloom filter in bytes</dd> |
| <dd><code>fpRate</code> - the probability that TServer will erroneously return a record that has not |
| ever been <code>put</code> into the <code>BloomFilter</code>.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="bySizeAndFPRate-int-double-org.apache.kudu.util.BloomFilter.HashFunction-"> |
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| <h4>bySizeAndFPRate</h4> |
| <pre>public static <a href="../../../../org/apache/kudu/util/BloomFilter.html" title="class in org.apache.kudu.util">BloomFilter</a> bySizeAndFPRate(int nBytes, |
| double fpRate, |
| org.apache.kudu.util.BloomFilter.HashFunction hashFunction)</pre> |
| <div class="block">Generate bloom filter.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>nBytes</code> - size of bloom filter in bytes</dd> |
| <dd><code>fpRate</code> - the probability that TServer will erroneously return a record that has not |
| ever been <code>put</code> into the <code>BloomFilter</code>.</dd> |
| <dd><code>hashFunction</code> - hashing used when updating or checking containment, user should pick |
| the hashing function from <code>HashFunctions</code></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="byCount-int-"> |
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| </a> |
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| <h4>byCount</h4> |
| <pre>public static <a href="../../../../org/apache/kudu/util/BloomFilter.html" title="class in org.apache.kudu.util">BloomFilter</a> byCount(int expectedCount)</pre> |
| <div class="block">Generate bloom filter, default hashing is <code>Murmur2</code> and false positive rate is 0.01.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>expectedCount</code> - The expected number of elements, targeted by this bloom filter. |
| It is used to size the bloom filter.</dd> |
| </dl> |
| </li> |
| </ul> |
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| <h4>byCountAndFPRate</h4> |
| <pre>public static <a href="../../../../org/apache/kudu/util/BloomFilter.html" title="class in org.apache.kudu.util">BloomFilter</a> byCountAndFPRate(int expectedCount, |
| double fpRate)</pre> |
| <div class="block">Generate bloom filter, default hashing is <code>Murmur2</code>.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>expectedCount</code> - The expected number of elements, targeted by this bloom filter. |
| It is used to size the bloom filter.</dd> |
| <dd><code>fpRate</code> - the probability that TServer will erroneously return a record that has not |
| ever been <code>put</code> into the <code>BloomFilter</code>.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="byCountAndFPRate-int-double-org.apache.kudu.util.BloomFilter.HashFunction-"> |
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| </a> |
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| <h4>byCountAndFPRate</h4> |
| <pre>public static <a href="../../../../org/apache/kudu/util/BloomFilter.html" title="class in org.apache.kudu.util">BloomFilter</a> byCountAndFPRate(int expectedCount, |
| double fpRate, |
| org.apache.kudu.util.BloomFilter.HashFunction hashFunction)</pre> |
| <div class="block">Generate bloom filter.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>expectedCount</code> - The expected number of elements, targeted by this bloom filter. |
| It is used to size the bloom filter.</dd> |
| <dd><code>fpRate</code> - the probability that TServer will erroneously return a record that has not |
| ever been <code>put</code> into the <code>BloomFilter</code>.</dd> |
| <dd><code>hashFunction</code> - hashing used when updating or checking containment, user should pick |
| the hashing function from <code>HashFunctions</code></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="put-byte:A-"> |
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| </a> |
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| <h4>put</h4> |
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