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| <div class="subTitle">org.apache.accumulo.core.client.sample</div> |
| <h2 title="Class AbstractHashSampler" class="title">Class AbstractHashSampler</h2> |
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| <li>org.apache.accumulo.core.client.sample.AbstractHashSampler</li> |
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| <dt>All Implemented Interfaces:</dt> |
| <dd><a href="../../../../../../org/apache/accumulo/core/client/sample/Sampler.html" title="interface in org.apache.accumulo.core.client.sample">Sampler</a></dd> |
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| <dl> |
| <dt>Direct Known Subclasses:</dt> |
| <dd><a href="../../../../../../org/apache/accumulo/core/client/sample/RowColumnSampler.html" title="class in org.apache.accumulo.core.client.sample">RowColumnSampler</a>, <a href="../../../../../../org/apache/accumulo/core/client/sample/RowSampler.html" title="class in org.apache.accumulo.core.client.sample">RowSampler</a></dd> |
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| <pre>public abstract class <span class="typeNameLabel">AbstractHashSampler</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> |
| implements <a href="../../../../../../org/apache/accumulo/core/client/sample/Sampler.html" title="interface in org.apache.accumulo.core.client.sample">Sampler</a></pre> |
| <div class="block">A base class that can be used to create Samplers based on hashing. This class offers consistent |
| options for configuring the hash function. The subclass decides which parts of the key to hash. |
| |
| <p> |
| This class support two options passed into <a href="../../../../../../org/apache/accumulo/core/client/sample/AbstractHashSampler.html#init-org.apache.accumulo.core.client.sample.SamplerConfiguration-"><code>init(SamplerConfiguration)</code></a>. One option is |
| <code>hasher</code> which specifies a hashing algorithm. Valid values for this option are <code>md5</code>, |
| <code>sha1</code>, and <code>murmur3_32</code>. If you are not sure, then choose <code>murmur3_32</code>. |
| |
| <p> |
| The second option is <code>modulus</code> which can have any positive integer as a value. |
| |
| <p> |
| Any data where <code>hash(data) % modulus == 0</code> will be selected for the sample.</div> |
| <dl> |
| <dt><span class="simpleTagLabel">Since:</span></dt> |
| <dd>1.8.0</dd> |
| </dl> |
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| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../org/apache/accumulo/core/client/sample/AbstractHashSampler.html#AbstractHashSampler--">AbstractHashSampler</a></span>()</code> </td> |
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| <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>boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/accumulo/core/client/sample/AbstractHashSampler.html#accept-org.apache.accumulo.core.data.Key-">accept</a></span>(<a href="../../../../../../org/apache/accumulo/core/data/Key.html" title="class in org.apache.accumulo.core.data">Key</a> k)</code> </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>protected abstract void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/accumulo/core/client/sample/AbstractHashSampler.html#hash-java.io.DataOutput-org.apache.accumulo.core.data.Key-">hash</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/io/DataOutput.html?is-external=true" title="class or interface in java.io">DataOutput</a> hasher, |
| <a href="../../../../../../org/apache/accumulo/core/data/Key.html" title="class in org.apache.accumulo.core.data">Key</a> k)</code> |
| <div class="block">Subclass must override this method and hash some portion of the key.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/accumulo/core/client/sample/AbstractHashSampler.html#init-org.apache.accumulo.core.client.sample.SamplerConfiguration-">init</a></span>(<a href="../../../../../../org/apache/accumulo/core/client/sample/SamplerConfiguration.html" title="class in org.apache.accumulo.core.client.sample">SamplerConfiguration</a> config)</code> |
| <div class="block">Subclasses with options should override this method and call <code>super.init(config)</code>.</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>protected boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/accumulo/core/client/sample/AbstractHashSampler.html#isValidOption-java.lang.String-">isValidOption</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> option)</code> |
| <div class="block">Subclasses with options should override this method and return true if the option is valid for |
| the subclass or if <code>super.isValidOption(opt)</code> returns true.</div> |
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| <h4>AbstractHashSampler</h4> |
| <pre>public AbstractHashSampler()</pre> |
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| <pre>protected boolean isValidOption(<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> option)</pre> |
| <div class="block">Subclasses with options should override this method and return true if the option is valid for |
| the subclass or if <code>super.isValidOption(opt)</code> returns true.</div> |
| </li> |
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| <a name="init-org.apache.accumulo.core.client.sample.SamplerConfiguration-"> |
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| <h4>init</h4> |
| <pre>public void init(<a href="../../../../../../org/apache/accumulo/core/client/sample/SamplerConfiguration.html" title="class in org.apache.accumulo.core.client.sample">SamplerConfiguration</a> config)</pre> |
| <div class="block">Subclasses with options should override this method and call <code>super.init(config)</code>.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../../../org/apache/accumulo/core/client/sample/Sampler.html#init-org.apache.accumulo.core.client.sample.SamplerConfiguration-">init</a></code> in interface <code><a href="../../../../../../org/apache/accumulo/core/client/sample/Sampler.html" title="interface in org.apache.accumulo.core.client.sample">Sampler</a></code></dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>config</code> - Configuration options for a sampler.</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="hash-java.io.DataOutput-org.apache.accumulo.core.data.Key-"> |
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| <h4>hash</h4> |
| <pre>protected abstract void hash(<a href="https://docs.oracle.com/javase/8/docs/api/java/io/DataOutput.html?is-external=true" title="class or interface in java.io">DataOutput</a> hasher, |
| <a href="../../../../../../org/apache/accumulo/core/data/Key.html" title="class in org.apache.accumulo.core.data">Key</a> k) |
| throws <a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></pre> |
| <div class="block">Subclass must override this method and hash some portion of the key.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>hasher</code> - Data written to this will be used to compute the hash for the key.</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/io/IOException.html?is-external=true" title="class or interface in java.io">IOException</a></code></dd> |
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| <h4>accept</h4> |
| <pre>public boolean accept(<a href="../../../../../../org/apache/accumulo/core/data/Key.html" title="class in org.apache.accumulo.core.data">Key</a> k)</pre> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../../../org/apache/accumulo/core/client/sample/Sampler.html#accept-org.apache.accumulo.core.data.Key-">accept</a></code> in interface <code><a href="../../../../../../org/apache/accumulo/core/client/sample/Sampler.html" title="interface in org.apache.accumulo.core.client.sample">Sampler</a></code></dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>k</code> - A key that was written to a rfile.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>True if the key (and its associtated value) should be stored in the rfile's sample. |
| Return false if it should not be included.</dd> |
| </dl> |
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