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| <div class="subTitle">org.apache.hadoop.mapreduce.lib.partition</div> |
| <h2 title="Class KeyFieldBasedPartitioner" class="title">Class KeyFieldBasedPartitioner<K2,V2></h2> |
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| <li> |
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| <li><a href="../../../../../../org/apache/hadoop/mapreduce/Partitioner.html" title="class in org.apache.hadoop.mapreduce">org.apache.hadoop.mapreduce.Partitioner</a><K2,V2></li> |
| <li> |
| <ul class="inheritance"> |
| <li>org.apache.hadoop.mapreduce.lib.partition.KeyFieldBasedPartitioner<K2,V2></li> |
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| <dt>Direct Known Subclasses:</dt> |
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| <pre>@InterfaceAudience.Public |
| @InterfaceStability.Stable |
| public class <span class="typeNameLabel">KeyFieldBasedPartitioner<K2,V2></span> |
| extends <a href="../../../../../../org/apache/hadoop/mapreduce/Partitioner.html" title="class in org.apache.hadoop.mapreduce">Partitioner</a><K2,V2> |
| implements <a href="../../../../../../org/apache/hadoop/conf/Configurable.html" title="interface in org.apache.hadoop.conf">Configurable</a></pre> |
| <div class="block">Defines a way to partition keys based on certain key fields (also see |
| <a href="../../../../../../org/apache/hadoop/mapreduce/lib/partition/KeyFieldBasedComparator.html" title="class in org.apache.hadoop.mapreduce.lib.partition"><code>KeyFieldBasedComparator</code></a>. |
| The key specification supported is of the form -k pos1[,pos2], where, |
| pos is of the form f[.c][opts], where f is the number |
| of the key field to use, and c is the number of the first character from |
| the beginning of the field. Fields and character posns are numbered |
| starting with 1; a character position of zero in pos2 indicates the |
| field's last character. If '.c' is omitted from pos1, it defaults to 1 |
| (the beginning of the field); if omitted from pos2, it defaults to 0 |
| (the end of the field).</div> |
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| <td class="colFirst"><code>static <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/hadoop/mapreduce/lib/partition/KeyFieldBasedPartitioner.html#PARTITIONER_OPTIONS">PARTITIONER_OPTIONS</a></span></code> </td> |
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| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/mapreduce/lib/partition/KeyFieldBasedPartitioner.html#KeyFieldBasedPartitioner--">KeyFieldBasedPartitioner</a></span>()</code> </td> |
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| <th class="colFirst" scope="col">Modifier and Type</th> |
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| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code><a href="../../../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/mapreduce/lib/partition/KeyFieldBasedPartitioner.html#getConf--">getConf</a></span>()</code> |
| <div class="block">Return the configuration used by this object.</div> |
| </td> |
| </tr> |
| <tr id="i1" 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/hadoop/mapreduce/lib/partition/KeyFieldBasedPartitioner.html#getKeyFieldPartitionerOption-org.apache.hadoop.mapreduce.JobContext-">getKeyFieldPartitionerOption</a></span>(<a href="../../../../../../org/apache/hadoop/mapreduce/JobContext.html" title="interface in org.apache.hadoop.mapreduce">JobContext</a> job)</code> |
| <div class="block">Get the <a href="../../../../../../org/apache/hadoop/mapreduce/lib/partition/KeyFieldBasedPartitioner.html" title="class in org.apache.hadoop.mapreduce.lib.partition"><code>KeyFieldBasedPartitioner</code></a> options</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>protected int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/mapreduce/lib/partition/KeyFieldBasedPartitioner.html#getPartition-int-int-">getPartition</a></span>(int hash, |
| int numReduceTasks)</code> </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/mapreduce/lib/partition/KeyFieldBasedPartitioner.html#getPartition-K2-V2-int-">getPartition</a></span>(<a href="../../../../../../org/apache/hadoop/mapreduce/lib/partition/KeyFieldBasedPartitioner.html" title="type parameter in KeyFieldBasedPartitioner">K2</a> key, |
| <a href="../../../../../../org/apache/hadoop/mapreduce/lib/partition/KeyFieldBasedPartitioner.html" title="type parameter in KeyFieldBasedPartitioner">V2</a> value, |
| int numReduceTasks)</code> |
| <div class="block">Get the partition number for a given key (hence record) given the total |
| number of partitions i.e.</div> |
| </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>protected int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/mapreduce/lib/partition/KeyFieldBasedPartitioner.html#hashCode-byte:A-int-int-int-">hashCode</a></span>(byte[] b, |
| int start, |
| int end, |
| int currentHash)</code> </td> |
| </tr> |
| <tr id="i5" class="rowColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/mapreduce/lib/partition/KeyFieldBasedPartitioner.html#setConf-org.apache.hadoop.conf.Configuration-">setConf</a></span>(<a href="../../../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</a> conf)</code> |
| <div class="block">Set the configuration to be used by this object.</div> |
| </td> |
| </tr> |
| <tr id="i6" class="altColor"> |
| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/mapreduce/lib/partition/KeyFieldBasedPartitioner.html#setKeyFieldPartitionerOptions-org.apache.hadoop.mapreduce.Job-java.lang.String-">setKeyFieldPartitionerOptions</a></span>(<a href="../../../../../../org/apache/hadoop/mapreduce/Job.html" title="class in org.apache.hadoop.mapreduce">Job</a> job, |
| <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> keySpec)</code> |
| <div class="block">Set the <a href="../../../../../../org/apache/hadoop/mapreduce/lib/partition/KeyFieldBasedPartitioner.html" title="class in org.apache.hadoop.mapreduce.lib.partition"><code>KeyFieldBasedPartitioner</code></a> options used for |
| <a href="../../../../../../org/apache/hadoop/mapreduce/Partitioner.html" title="class in org.apache.hadoop.mapreduce"><code>Partitioner</code></a></div> |
| </td> |
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| <h3>Field Detail</h3> |
| <a name="PARTITIONER_OPTIONS"> |
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| <h4>PARTITIONER_OPTIONS</h4> |
| <pre>public static <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> PARTITIONER_OPTIONS</pre> |
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| <h4>KeyFieldBasedPartitioner</h4> |
| <pre>public KeyFieldBasedPartitioner()</pre> |
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| <a name="setConf-org.apache.hadoop.conf.Configuration-"> |
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| <h4>setConf</h4> |
| <pre>public void setConf(<a href="../../../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</a> conf)</pre> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from interface: <code><a href="../../../../../../org/apache/hadoop/conf/Configurable.html#setConf-org.apache.hadoop.conf.Configuration-">Configurable</a></code></span></div> |
| <div class="block">Set the configuration to be used by this object.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../../../org/apache/hadoop/conf/Configurable.html#setConf-org.apache.hadoop.conf.Configuration-">setConf</a></code> in interface <code><a href="../../../../../../org/apache/hadoop/conf/Configurable.html" title="interface in org.apache.hadoop.conf">Configurable</a></code></dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>conf</code> - configuration to be used</dd> |
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| <h4>getConf</h4> |
| <pre>public <a href="../../../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</a> getConf()</pre> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from interface: <code><a href="../../../../../../org/apache/hadoop/conf/Configurable.html#getConf--">Configurable</a></code></span></div> |
| <div class="block">Return the configuration used by this object.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../../../org/apache/hadoop/conf/Configurable.html#getConf--">getConf</a></code> in interface <code><a href="../../../../../../org/apache/hadoop/conf/Configurable.html" title="interface in org.apache.hadoop.conf">Configurable</a></code></dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>Configuration</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="getPartition-java.lang.Object-java.lang.Object-int-"> |
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| <h4>getPartition</h4> |
| <pre>public int getPartition(<a href="../../../../../../org/apache/hadoop/mapreduce/lib/partition/KeyFieldBasedPartitioner.html" title="type parameter in KeyFieldBasedPartitioner">K2</a> key, |
| <a href="../../../../../../org/apache/hadoop/mapreduce/lib/partition/KeyFieldBasedPartitioner.html" title="type parameter in KeyFieldBasedPartitioner">V2</a> value, |
| int numReduceTasks)</pre> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from class: <code><a href="../../../../../../org/apache/hadoop/mapreduce/Partitioner.html#getPartition-KEY-VALUE-int-">Partitioner</a></code></span></div> |
| <div class="block">Get the partition number for a given key (hence record) given the total |
| number of partitions i.e. number of reduce-tasks for the job. |
| |
| <p>Typically a hash function on a all or a subset of the key.</p></div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../../../org/apache/hadoop/mapreduce/Partitioner.html#getPartition-KEY-VALUE-int-">getPartition</a></code> in class <code><a href="../../../../../../org/apache/hadoop/mapreduce/Partitioner.html" title="class in org.apache.hadoop.mapreduce">Partitioner</a><<a href="../../../../../../org/apache/hadoop/mapreduce/lib/partition/KeyFieldBasedPartitioner.html" title="type parameter in KeyFieldBasedPartitioner">K2</a>,<a href="../../../../../../org/apache/hadoop/mapreduce/lib/partition/KeyFieldBasedPartitioner.html" title="type parameter in KeyFieldBasedPartitioner">V2</a>></code></dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>key</code> - the key to be partioned.</dd> |
| <dd><code>value</code> - the entry value.</dd> |
| <dd><code>numReduceTasks</code> - the total number of partitions.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the partition number for the <code>key</code>.</dd> |
| </dl> |
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| <h4>hashCode</h4> |
| <pre>protected int hashCode(byte[] b, |
| int start, |
| int end, |
| int currentHash)</pre> |
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| <h4>getPartition</h4> |
| <pre>protected int getPartition(int hash, |
| int numReduceTasks)</pre> |
| </li> |
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| <a name="setKeyFieldPartitionerOptions-org.apache.hadoop.mapreduce.Job-java.lang.String-"> |
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| <h4>setKeyFieldPartitionerOptions</h4> |
| <pre>public void setKeyFieldPartitionerOptions(<a href="../../../../../../org/apache/hadoop/mapreduce/Job.html" title="class in org.apache.hadoop.mapreduce">Job</a> job, |
| <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> keySpec)</pre> |
| <div class="block">Set the <a href="../../../../../../org/apache/hadoop/mapreduce/lib/partition/KeyFieldBasedPartitioner.html" title="class in org.apache.hadoop.mapreduce.lib.partition"><code>KeyFieldBasedPartitioner</code></a> options used for |
| <a href="../../../../../../org/apache/hadoop/mapreduce/Partitioner.html" title="class in org.apache.hadoop.mapreduce"><code>Partitioner</code></a></div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>keySpec</code> - the key specification of the form -k pos1[,pos2], where, |
| pos is of the form f[.c][opts], where f is the number |
| of the key field to use, and c is the number of the first character from |
| the beginning of the field. Fields and character posns are numbered |
| starting with 1; a character position of zero in pos2 indicates the |
| field's last character. If '.c' is omitted from pos1, it defaults to 1 |
| (the beginning of the field); if omitted from pos2, it defaults to 0 |
| (the end of the field).</dd> |
| </dl> |
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| <a name="getKeyFieldPartitionerOption-org.apache.hadoop.mapreduce.JobContext-"> |
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| <h4>getKeyFieldPartitionerOption</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> getKeyFieldPartitionerOption(<a href="../../../../../../org/apache/hadoop/mapreduce/JobContext.html" title="interface in org.apache.hadoop.mapreduce">JobContext</a> job)</pre> |
| <div class="block">Get the <a href="../../../../../../org/apache/hadoop/mapreduce/lib/partition/KeyFieldBasedPartitioner.html" title="class in org.apache.hadoop.mapreduce.lib.partition"><code>KeyFieldBasedPartitioner</code></a> options</div> |
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