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| <div class="subTitle">org.apache.hadoop.mapreduce.lib.partition</div> |
| <h2 title="Class BinaryPartitioner" class="title">Class BinaryPartitioner<V></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><<a href="../../../../../../org/apache/hadoop/io/BinaryComparable.html" title="class in org.apache.hadoop.io">BinaryComparable</a>,V></li> |
| <li> |
| <ul class="inheritance"> |
| <li>org.apache.hadoop.mapreduce.lib.partition.BinaryPartitioner<V></li> |
| </ul> |
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| <dd><a href="../../../../../../org/apache/hadoop/conf/Configurable.html" title="interface in org.apache.hadoop.conf">Configurable</a></dd> |
| </dl> |
| <dl> |
| <dt>Direct Known Subclasses:</dt> |
| <dd><a href="../../../../../../org/apache/hadoop/mapred/lib/BinaryPartitioner.html" title="class in org.apache.hadoop.mapred.lib">BinaryPartitioner</a></dd> |
| </dl> |
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| <br> |
| <pre>@InterfaceAudience.Public |
| @InterfaceStability.Evolving |
| public class <span class="typeNameLabel">BinaryPartitioner<V></span> |
| extends <a href="../../../../../../org/apache/hadoop/mapreduce/Partitioner.html" title="class in org.apache.hadoop.mapreduce">Partitioner</a><<a href="../../../../../../org/apache/hadoop/io/BinaryComparable.html" title="class in org.apache.hadoop.io">BinaryComparable</a>,V> |
| implements <a href="../../../../../../org/apache/hadoop/conf/Configurable.html" title="interface in org.apache.hadoop.conf">Configurable</a></pre> |
| <div class="block"><p>Partition <a href="../../../../../../org/apache/hadoop/io/BinaryComparable.html" title="class in org.apache.hadoop.io"><code>BinaryComparable</code></a> keys using a configurable part of |
| the bytes array returned by <a href="../../../../../../org/apache/hadoop/io/BinaryComparable.html#getBytes--"><code>BinaryComparable.getBytes()</code></a>.</p> |
| |
| <p>The subarray to be used for the partitioning can be defined by means |
| of the following properties: |
| <ul> |
| <li> |
| <i>mapreduce.partition.binarypartitioner.left.offset</i>: |
| left offset in array (0 by default) |
| </li> |
| <li> |
| <i>mapreduce.partition.binarypartitioner.right.offset</i>: |
| right offset in array (-1 by default) |
| </li> |
| </ul> |
| Like in Python, both negative and positive offsets are allowed, but |
| the meaning is slightly different. In case of an array of length 5, |
| for instance, the possible offsets are: |
| <pre><code> |
| +---+---+---+---+---+ |
| | B | B | B | B | B | |
| +---+---+---+---+---+ |
| 0 1 2 3 4 |
| -5 -4 -3 -2 -1 |
| </code></pre> |
| The first row of numbers gives the position of the offsets 0...5 in |
| the array; the second row gives the corresponding negative offsets. |
| Contrary to Python, the specified subarray has byte <code>i</code> |
| and <code>j</code> as first and last element, repectively, when |
| <code>i</code> and <code>j</code> are the left and right offset. |
| |
| <p>For Hadoop programs written in Java, it is advisable to use one of |
| the following static convenience methods for setting the offsets: |
| <ul> |
| <li><a href="../../../../../../org/apache/hadoop/mapreduce/lib/partition/BinaryPartitioner.html#setOffsets-org.apache.hadoop.conf.Configuration-int-int-"><code>setOffsets(org.apache.hadoop.conf.Configuration, int, int)</code></a></li> |
| <li><a href="../../../../../../org/apache/hadoop/mapreduce/lib/partition/BinaryPartitioner.html#setLeftOffset-org.apache.hadoop.conf.Configuration-int-"><code>setLeftOffset(org.apache.hadoop.conf.Configuration, int)</code></a></li> |
| <li><a href="../../../../../../org/apache/hadoop/mapreduce/lib/partition/BinaryPartitioner.html#setRightOffset-org.apache.hadoop.conf.Configuration-int-"><code>setRightOffset(org.apache.hadoop.conf.Configuration, int)</code></a></li> |
| </ul></div> |
| </li> |
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| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/mapreduce/lib/partition/BinaryPartitioner.html#LEFT_OFFSET_PROPERTY_NAME">LEFT_OFFSET_PROPERTY_NAME</a></span></code> </td> |
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| <tr class="rowColor"> |
| <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/BinaryPartitioner.html#RIGHT_OFFSET_PROPERTY_NAME">RIGHT_OFFSET_PROPERTY_NAME</a></span></code> </td> |
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| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/mapreduce/lib/partition/BinaryPartitioner.html#BinaryPartitioner--">BinaryPartitioner</a></span>()</code> </td> |
| </tr> |
| </table> |
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| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
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| </tr> |
| <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/BinaryPartitioner.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>int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/mapreduce/lib/partition/BinaryPartitioner.html#getPartition-org.apache.hadoop.io.BinaryComparable-V-int-">getPartition</a></span>(<a href="../../../../../../org/apache/hadoop/io/BinaryComparable.html" title="class in org.apache.hadoop.io">BinaryComparable</a> key, |
| <a href="../../../../../../org/apache/hadoop/mapreduce/lib/partition/BinaryPartitioner.html" title="type parameter in BinaryPartitioner">V</a> value, |
| int numPartitions)</code> |
| <div class="block">Use (the specified slice of the array returned by) |
| <a href="../../../../../../org/apache/hadoop/io/BinaryComparable.html#getBytes--"><code>BinaryComparable.getBytes()</code></a> to partition.</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/hadoop/mapreduce/lib/partition/BinaryPartitioner.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="i3" class="rowColor"> |
| <td class="colFirst"><code>static void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/mapreduce/lib/partition/BinaryPartitioner.html#setLeftOffset-org.apache.hadoop.conf.Configuration-int-">setLeftOffset</a></span>(<a href="../../../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</a> conf, |
| int offset)</code> |
| <div class="block">Set the subarray to be used for partitioning to |
| <code>bytes[offset:]</code> in Python syntax.</div> |
| </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>static void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/mapreduce/lib/partition/BinaryPartitioner.html#setOffsets-org.apache.hadoop.conf.Configuration-int-int-">setOffsets</a></span>(<a href="../../../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</a> conf, |
| int left, |
| int right)</code> |
| <div class="block">Set the subarray to be used for partitioning to |
| <code>bytes[left:(right+1)]</code> in Python syntax.</div> |
| </td> |
| </tr> |
| <tr id="i5" class="rowColor"> |
| <td class="colFirst"><code>static void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/hadoop/mapreduce/lib/partition/BinaryPartitioner.html#setRightOffset-org.apache.hadoop.conf.Configuration-int-">setRightOffset</a></span>(<a href="../../../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</a> conf, |
| int offset)</code> |
| <div class="block">Set the subarray to be used for partitioning to |
| <code>bytes[:(offset+1)]</code> in Python syntax.</div> |
| </td> |
| </tr> |
| </table> |
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| <a name="LEFT_OFFSET_PROPERTY_NAME"> |
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| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>LEFT_OFFSET_PROPERTY_NAME</h4> |
| <pre>public static final <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> LEFT_OFFSET_PROPERTY_NAME</pre> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../../../constant-values.html#org.apache.hadoop.mapreduce.lib.partition.BinaryPartitioner.LEFT_OFFSET_PROPERTY_NAME">Constant Field Values</a></dd> |
| </dl> |
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| <h4>RIGHT_OFFSET_PROPERTY_NAME</h4> |
| <pre>public static final <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> RIGHT_OFFSET_PROPERTY_NAME</pre> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../../../constant-values.html#org.apache.hadoop.mapreduce.lib.partition.BinaryPartitioner.RIGHT_OFFSET_PROPERTY_NAME">Constant Field Values</a></dd> |
| </dl> |
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| <a name="BinaryPartitioner--"> |
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| <h4>BinaryPartitioner</h4> |
| <pre>public BinaryPartitioner()</pre> |
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| <h4>setOffsets</h4> |
| <pre>public static void setOffsets(<a href="../../../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</a> conf, |
| int left, |
| int right)</pre> |
| <div class="block">Set the subarray to be used for partitioning to |
| <code>bytes[left:(right+1)]</code> in Python syntax.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>conf</code> - configuration object</dd> |
| <dd><code>left</code> - left Python-style offset</dd> |
| <dd><code>right</code> - right Python-style offset</dd> |
| </dl> |
| </li> |
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| <a name="setLeftOffset-org.apache.hadoop.conf.Configuration-int-"> |
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| <h4>setLeftOffset</h4> |
| <pre>public static void setLeftOffset(<a href="../../../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</a> conf, |
| int offset)</pre> |
| <div class="block">Set the subarray to be used for partitioning to |
| <code>bytes[offset:]</code> in Python syntax.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>conf</code> - configuration object</dd> |
| <dd><code>offset</code> - left Python-style offset</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="setRightOffset-org.apache.hadoop.conf.Configuration-int-"> |
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| </a> |
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| <h4>setRightOffset</h4> |
| <pre>public static void setRightOffset(<a href="../../../../../../org/apache/hadoop/conf/Configuration.html" title="class in org.apache.hadoop.conf">Configuration</a> conf, |
| int offset)</pre> |
| <div class="block">Set the subarray to be used for partitioning to |
| <code>bytes[:(offset+1)]</code> in Python syntax.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>conf</code> - configuration object</dd> |
| <dd><code>offset</code> - right Python-style offset</dd> |
| </dl> |
| </li> |
| </ul> |
| <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> |
| </dl> |
| </li> |
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| <a name="getConf--"> |
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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> |
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| <a name="getPartition-org.apache.hadoop.io.BinaryComparable-java.lang.Object-int-"> |
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| <h4>getPartition</h4> |
| <pre>public int getPartition(<a href="../../../../../../org/apache/hadoop/io/BinaryComparable.html" title="class in org.apache.hadoop.io">BinaryComparable</a> key, |
| <a href="../../../../../../org/apache/hadoop/mapreduce/lib/partition/BinaryPartitioner.html" title="type parameter in BinaryPartitioner">V</a> value, |
| int numPartitions)</pre> |
| <div class="block">Use (the specified slice of the array returned by) |
| <a href="../../../../../../org/apache/hadoop/io/BinaryComparable.html#getBytes--"><code>BinaryComparable.getBytes()</code></a> to partition.</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/io/BinaryComparable.html" title="class in org.apache.hadoop.io">BinaryComparable</a>,<a href="../../../../../../org/apache/hadoop/mapreduce/lib/partition/BinaryPartitioner.html" title="type parameter in BinaryPartitioner">V</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>numPartitions</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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