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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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<li><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</a></li>
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<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">&nbsp;</span></span><span id="t1" class="tableTab"><span><a href="javascript:show(1);">Static Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd">&nbsp;</span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd">&nbsp;</span></span></caption>
<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Method and Description</th>
</tr>
<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&nbsp;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&nbsp;expectedCount,
double&nbsp;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&nbsp;expectedCount,
double&nbsp;fpRate,
org.apache.kudu.util.BloomFilter.HashFunction&nbsp;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&nbsp;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&nbsp;nBytes,
double&nbsp;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&nbsp;nBytes,
double&nbsp;fpRate,
org.apache.kudu.util.BloomFilter.HashFunction&nbsp;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&nbsp;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&nbsp;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[]&nbsp;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&nbsp;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&nbsp;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&nbsp;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&nbsp;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&nbsp;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>&nbsp;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>&nbsp;</td>
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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>bySize</h4>
<pre>public static&nbsp;<a href="../../../../org/apache/kudu/util/BloomFilter.html" title="class in org.apache.kudu.util">BloomFilter</a>&nbsp;bySize(int&nbsp;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&nbsp;<a href="../../../../org/apache/kudu/util/BloomFilter.html" title="class in org.apache.kudu.util">BloomFilter</a>&nbsp;bySizeAndFPRate(int&nbsp;nBytes,
double&nbsp;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>
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<h4>bySizeAndFPRate</h4>
<pre>public static&nbsp;<a href="../../../../org/apache/kudu/util/BloomFilter.html" title="class in org.apache.kudu.util">BloomFilter</a>&nbsp;bySizeAndFPRate(int&nbsp;nBytes,
double&nbsp;fpRate,
org.apache.kudu.util.BloomFilter.HashFunction&nbsp;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>
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<h4>byCount</h4>
<pre>public static&nbsp;<a href="../../../../org/apache/kudu/util/BloomFilter.html" title="class in org.apache.kudu.util">BloomFilter</a>&nbsp;byCount(int&nbsp;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>
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<h4>byCountAndFPRate</h4>
<pre>public static&nbsp;<a href="../../../../org/apache/kudu/util/BloomFilter.html" title="class in org.apache.kudu.util">BloomFilter</a>&nbsp;byCountAndFPRate(int&nbsp;expectedCount,
double&nbsp;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>
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<h4>byCountAndFPRate</h4>
<pre>public static&nbsp;<a href="../../../../org/apache/kudu/util/BloomFilter.html" title="class in org.apache.kudu.util">BloomFilter</a>&nbsp;byCountAndFPRate(int&nbsp;expectedCount,
double&nbsp;fpRate,
org.apache.kudu.util.BloomFilter.HashFunction&nbsp;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>
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<h4>put</h4>
<pre>public&nbsp;void&nbsp;put(byte[]&nbsp;data)</pre>
<div class="block">Update bloom filter with a <code>byte[]</code>.</div>
</li>
</ul>
<a name="put-boolean-">
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</a>
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<h4>put</h4>
<pre>public&nbsp;void&nbsp;put(boolean&nbsp;data)</pre>
<div class="block">Update bloom filter with a <code>boolean</code>.</div>
</li>
</ul>
<a name="put-byte-">
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<h4>put</h4>
<pre>public&nbsp;void&nbsp;put(byte&nbsp;data)</pre>
<div class="block">Update bloom filter with a <code>byte</code>.</div>
</li>
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<pre>public&nbsp;void&nbsp;put(short&nbsp;data)</pre>
<div class="block">Update bloom filter with a <code>short</code>.</div>
</li>
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<pre>public&nbsp;void&nbsp;put(int&nbsp;data)</pre>
<div class="block">Update bloom filter with a <code>int</code>.</div>
</li>
</ul>
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<h4>put</h4>
<pre>public&nbsp;void&nbsp;put(long&nbsp;data)</pre>
<div class="block">Update bloom filter with a <code>long</code>.</div>
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<pre>public&nbsp;void&nbsp;put(float&nbsp;data)</pre>
<div class="block">Update bloom filter with a <code>float</code>.</div>
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<pre>public&nbsp;void&nbsp;put(double&nbsp;data)</pre>
<div class="block">Update bloom filter with a <code>double</code>.</div>
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<pre>public&nbsp;void&nbsp;put(<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>&nbsp;data)</pre>
<div class="block">Update bloom filter with a <code>String</code>.</div>
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<pre>public&nbsp;byte[]&nbsp;getBitSet()</pre>
<div class="block">Get the internal bit set in bytes.</div>
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<pre>public&nbsp;int&nbsp;getNHashes()</pre>
<div class="block">Get the number of hashing times when updating or checking containment.</div>
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<pre>public&nbsp;<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>&nbsp;getHashFunctionName()</pre>
<div class="block">Get the name of hashing used when updating or checking containment.</div>
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<pre>public&nbsp;<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>&nbsp;toString()</pre>
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