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| <h2 title="Class GroupIntoBatches" class="title">Class GroupIntoBatches<K,InputT></h2> |
| </div> |
| <div class="contentContainer"> |
| <ul class="inheritance"> |
| <li>java.lang.Object</li> |
| <li> |
| <ul class="inheritance"> |
| <li><a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html" title="class in org.apache.beam.sdk.transforms">org.apache.beam.sdk.transforms.PTransform</a><<a href="../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values">PCollection</a><<a href="../../../../../org/apache/beam/sdk/values/KV.html" title="class in org.apache.beam.sdk.values">KV</a><K,InputT>>,<a href="../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values">PCollection</a><<a href="../../../../../org/apache/beam/sdk/values/KV.html" title="class in org.apache.beam.sdk.values">KV</a><K,java.lang.Iterable<InputT>>>></li> |
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| <ul class="inheritance"> |
| <li>org.apache.beam.sdk.transforms.GroupIntoBatches<K,InputT></li> |
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| <dd>java.io.Serializable, <a href="../../../../../org/apache/beam/sdk/transforms/display/HasDisplayData.html" title="interface in org.apache.beam.sdk.transforms.display">HasDisplayData</a></dd> |
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| <pre>public class <span class="typeNameLabel">GroupIntoBatches<K,InputT></span> |
| extends <a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html" title="class in org.apache.beam.sdk.transforms">PTransform</a><<a href="../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values">PCollection</a><<a href="../../../../../org/apache/beam/sdk/values/KV.html" title="class in org.apache.beam.sdk.values">KV</a><K,InputT>>,<a href="../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values">PCollection</a><<a href="../../../../../org/apache/beam/sdk/values/KV.html" title="class in org.apache.beam.sdk.values">KV</a><K,java.lang.Iterable<InputT>>>></pre> |
| <div class="block">A <a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html" title="class in org.apache.beam.sdk.transforms"><code>PTransform</code></a> that batches inputs to a desired batch size. Batches will contain only |
| elements of a single key. |
| |
| <p>Elements are buffered until there are <code>batchSize</code> elements buffered, at which point they |
| are output to the output <a href="../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values"><code>PCollection</code></a>. |
| |
| <p>Windows are preserved (batches contain elements from the same window). Batches may contain |
| elements from more than one bundle |
| |
| <p>Example (batch call a webservice and get return codes) |
| |
| <pre><code> |
| Pipeline pipeline = Pipeline.create(...); |
| ... // KV collection |
| long batchSize = 100L; |
| pipeline.apply(GroupIntoBatches.<String, String>ofSize(batchSize)) |
| .setCoder(KvCoder.of(StringUtf8Coder.of(), IterableCoder.of(StringUtf8Coder.of()))) |
| .apply(ParDo.of(new DoFn<KV<String, Iterable<String>>, KV<String, String>>() { |
| {@literal @}ProcessElement |
| public void processElement({@literal @}Element KV<String, Iterable<String>> element, |
| OutputReceiver<KV<String, String>> r) { |
| r.output(KV.of(element.getKey(), callWebService(element.getValue()))); |
| } |
| })); |
| pipeline.run(); |
| </code></pre></div> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../../serialized-form.html#org.apache.beam.sdk.transforms.GroupIntoBatches">Serialized Form</a></dd> |
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| <code><a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html#name">name</a></code></li> |
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| <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><a href="../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values">PCollection</a><<a href="../../../../../org/apache/beam/sdk/values/KV.html" title="class in org.apache.beam.sdk.values">KV</a><<a href="../../../../../org/apache/beam/sdk/transforms/GroupIntoBatches.html" title="type parameter in GroupIntoBatches">K</a>,java.lang.Iterable<<a href="../../../../../org/apache/beam/sdk/transforms/GroupIntoBatches.html" title="type parameter in GroupIntoBatches">InputT</a>>>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/transforms/GroupIntoBatches.html#expand-org.apache.beam.sdk.values.PCollection-">expand</a></span>(<a href="../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values">PCollection</a><<a href="../../../../../org/apache/beam/sdk/values/KV.html" title="class in org.apache.beam.sdk.values">KV</a><<a href="../../../../../org/apache/beam/sdk/transforms/GroupIntoBatches.html" title="type parameter in GroupIntoBatches">K</a>,<a href="../../../../../org/apache/beam/sdk/transforms/GroupIntoBatches.html" title="type parameter in GroupIntoBatches">InputT</a>>> input)</code> |
| <div class="block">Override this method to specify how this <code>PTransform</code> should be expanded on the given |
| <code>InputT</code>.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>static <K,InputT> <a href="../../../../../org/apache/beam/sdk/transforms/GroupIntoBatches.html" title="class in org.apache.beam.sdk.transforms">GroupIntoBatches</a><K,InputT></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/transforms/GroupIntoBatches.html#ofSize-long-">ofSize</a></span>(long batchSize)</code> </td> |
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| <h3>Methods inherited from class org.apache.beam.sdk.transforms.<a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html" title="class in org.apache.beam.sdk.transforms">PTransform</a></h3> |
| <code><a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html#getAdditionalInputs--">getAdditionalInputs</a>, <a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html#getDefaultOutputCoder--">getDefaultOutputCoder</a>, <a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html#getDefaultOutputCoder-InputT-">getDefaultOutputCoder</a>, <a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html#getDefaultOutputCoder-InputT-org.apache.beam.sdk.values.PCollection-">getDefaultOutputCoder</a>, <a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html#getKindString--">getKindString</a>, <a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html#getName--">getName</a>, <a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html#populateDisplayData-org.apache.beam.sdk.transforms.display.DisplayData.Builder-">populateDisplayData</a>, <a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html#toString--">toString</a>, <a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html#validate-org.apache.beam.sdk.options.PipelineOptions-">validate</a></code></li> |
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| <!-- --> |
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| <code>clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait</code></li> |
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| <h4>ofSize</h4> |
| <pre>public static <K,InputT> <a href="../../../../../org/apache/beam/sdk/transforms/GroupIntoBatches.html" title="class in org.apache.beam.sdk.transforms">GroupIntoBatches</a><K,InputT> ofSize(long batchSize)</pre> |
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| <h4>expand</h4> |
| <pre>public <a href="../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values">PCollection</a><<a href="../../../../../org/apache/beam/sdk/values/KV.html" title="class in org.apache.beam.sdk.values">KV</a><<a href="../../../../../org/apache/beam/sdk/transforms/GroupIntoBatches.html" title="type parameter in GroupIntoBatches">K</a>,java.lang.Iterable<<a href="../../../../../org/apache/beam/sdk/transforms/GroupIntoBatches.html" title="type parameter in GroupIntoBatches">InputT</a>>>> expand(<a href="../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values">PCollection</a><<a href="../../../../../org/apache/beam/sdk/values/KV.html" title="class in org.apache.beam.sdk.values">KV</a><<a href="../../../../../org/apache/beam/sdk/transforms/GroupIntoBatches.html" title="type parameter in GroupIntoBatches">K</a>,<a href="../../../../../org/apache/beam/sdk/transforms/GroupIntoBatches.html" title="type parameter in GroupIntoBatches">InputT</a>>> input)</pre> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from class: <code><a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html#expand-InputT-">PTransform</a></code></span></div> |
| <div class="block">Override this method to specify how this <code>PTransform</code> should be expanded on the given |
| <code>InputT</code>. |
| |
| <p>NOTE: This method should not be called directly. Instead apply the <code>PTransform</code> should |
| be applied to the <code>InputT</code> using the <code>apply</code> method. |
| |
| <p>Composite transforms, which are defined in terms of other transforms, should return the |
| output of one of the composed transforms. Non-composite transforms, which do not apply any |
| transforms internally, should return a new unbound output and register evaluators (via |
| backend-specific registration methods).</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html#expand-InputT-">expand</a></code> in class <code><a href="../../../../../org/apache/beam/sdk/transforms/PTransform.html" title="class in org.apache.beam.sdk.transforms">PTransform</a><<a href="../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values">PCollection</a><<a href="../../../../../org/apache/beam/sdk/values/KV.html" title="class in org.apache.beam.sdk.values">KV</a><<a href="../../../../../org/apache/beam/sdk/transforms/GroupIntoBatches.html" title="type parameter in GroupIntoBatches">K</a>,<a href="../../../../../org/apache/beam/sdk/transforms/GroupIntoBatches.html" title="type parameter in GroupIntoBatches">InputT</a>>>,<a href="../../../../../org/apache/beam/sdk/values/PCollection.html" title="class in org.apache.beam.sdk.values">PCollection</a><<a href="../../../../../org/apache/beam/sdk/values/KV.html" title="class in org.apache.beam.sdk.values">KV</a><<a href="../../../../../org/apache/beam/sdk/transforms/GroupIntoBatches.html" title="type parameter in GroupIntoBatches">K</a>,java.lang.Iterable<<a href="../../../../../org/apache/beam/sdk/transforms/GroupIntoBatches.html" title="type parameter in GroupIntoBatches">InputT</a>>>>></code></dd> |
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