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| <dd><code><a href="Partitioner.html" title="interface in org.apache.nemo.common.partitioner">Partitioner</a><java.lang.Integer></code></dd> |
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| <pre><a href="DedicatedKeyPerElement.html" title="annotation in org.apache.nemo.common.partitioner">@DedicatedKeyPerElement</a> |
| public final class <span class="typeNameLabel">DedicatedKeyPerElementPartitioner</span> |
| extends java.lang.Object |
| implements <a href="Partitioner.html" title="interface in org.apache.nemo.common.partitioner">Partitioner</a><java.lang.Integer></pre> |
| <div class="block">An implementation of <a href="Partitioner.html" title="interface in org.apache.nemo.common.partitioner"><code>Partitioner</code></a> which assigns a dedicated key per an output data from a task. |
| WARNING: Because this partitioner assigns a dedicated key per element, it should be used under specific circumstances |
| that the number of output element is not that many. For example, every output element of |
| StreamTransform inserted by large shuffle optimization is always |
| a partition. In this case, assigning a key for each element can be useful.</div> |
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| <td class="colFirst"><code>java.lang.Integer</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#partition(java.lang.Object)">partition</a></span>​(java.lang.Object element)</code></th> |
| <td class="colLast"> |
| <div class="block">Divides the output data from a task into multiple blocks.</div> |
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| <h4>DedicatedKeyPerElementPartitioner</h4> |
| <pre>public DedicatedKeyPerElementPartitioner()</pre> |
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| <h4>partition</h4> |
| <pre class="methodSignature">public java.lang.Integer partition​(java.lang.Object element)</pre> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from interface: <code><a href="Partitioner.html#partition(java.lang.Object)">Partitioner</a></code></span></div> |
| <div class="block">Divides the output data from a task into multiple blocks.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="Partitioner.html#partition(java.lang.Object)">partition</a></code> in interface <code><a href="Partitioner.html" title="interface in org.apache.nemo.common.partitioner">Partitioner</a><java.lang.Integer></code></dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>element</code> - the output element from a source task.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the key of the partition in the block to write the element.</dd> |
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