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<div class="subTitle">org.apache.beam.runners.spark.structuredstreaming.translation</div>
<h2 title="Class PipelineTranslator" class="title">Class PipelineTranslator</h2>
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<li>java.lang.Object</li>
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<li>org.apache.beam.runners.spark.structuredstreaming.translation.PipelineTranslator</li>
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<dd><a href="../../../../../../../org/apache/beam/runners/spark/structuredstreaming/translation/batch/PipelineTranslatorBatch.html" title="class in org.apache.beam.runners.spark.structuredstreaming.translation.batch">PipelineTranslatorBatch</a></dd>
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<pre><a href="../../../../../../../org/apache/beam/sdk/annotations/Internal.html" title="annotation in org.apache.beam.sdk.annotations">@Internal</a>
public abstract class <span class="typeNameLabel">PipelineTranslator</span>
extends java.lang.Object</pre>
<div class="block">The pipeline translator translates a Beam <a href="../../../../../../../org/apache/beam/sdk/Pipeline.html" title="class in org.apache.beam.sdk"><code>Pipeline</code></a> into a Spark correspondence, that can
then be evaluated.
<p>The translation involves traversing the hierarchy of a pipeline multiple times:
<ol>
<li>Detect if <a href="../../../../../../../org/apache/beam/sdk/options/StreamingOptions.html#setStreaming-boolean-"><code>streaming</code></a> mode is required.
<li>Identify datasets that are repeatedly used as input and should be cached.
<li>And finally, translate each primitive or composite <a href="../../../../../../../org/apache/beam/sdk/transforms/PTransform.html" title="class in org.apache.beam.sdk.transforms"><code>PTransform</code></a> that is <a href="../../../../../../../org/apache/beam/runners/spark/structuredstreaming/translation/PipelineTranslator.html#getTransformTranslator-TransformT-"><code>known</code></a> and <a href="../../../../../../../org/apache/beam/runners/spark/structuredstreaming/translation/TransformTranslator.html#canTranslate-TransformT-"><code>supported</code></a> into
its Spark correspondence. If a composite is not supported, it will be expanded further into
its parts and translated then.
</ol></div>
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<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Class and Description</th>
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<td class="colFirst"><code>static interface&nbsp;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/beam/runners/spark/structuredstreaming/translation/PipelineTranslator.TranslationState.html" title="interface in org.apache.beam.runners.spark.structuredstreaming.translation">PipelineTranslator.TranslationState</a></span></code>
<div class="block">Shared, mutable state during the translation of a pipeline and omitted afterwards.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>static interface&nbsp;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/beam/runners/spark/structuredstreaming/translation/PipelineTranslator.UnresolvedTranslation.html" title="interface in org.apache.beam.runners.spark.structuredstreaming.translation">PipelineTranslator.UnresolvedTranslation</a>&lt;<a href="../../../../../../../org/apache/beam/runners/spark/structuredstreaming/translation/PipelineTranslator.UnresolvedTranslation.html" title="type parameter in PipelineTranslator.UnresolvedTranslation">InT</a>,<a href="../../../../../../../org/apache/beam/runners/spark/structuredstreaming/translation/PipelineTranslator.UnresolvedTranslation.html" title="type parameter in PipelineTranslator.UnresolvedTranslation">T</a>&gt;</span></code>
<div class="block">Unresolved translation, allowing to optimize the generated Spark DAG.</div>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/beam/runners/spark/structuredstreaming/translation/PipelineTranslator.html#PipelineTranslator--">PipelineTranslator</a></span>()</code>&nbsp;</td>
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<td class="colFirst"><code>static void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/beam/runners/spark/structuredstreaming/translation/PipelineTranslator.html#detectStreamingMode-org.apache.beam.sdk.Pipeline-org.apache.beam.sdk.options.StreamingOptions-">detectStreamingMode</a></span>(<a href="../../../../../../../org/apache/beam/sdk/Pipeline.html" title="class in org.apache.beam.sdk">Pipeline</a>&nbsp;pipeline,
<a href="../../../../../../../org/apache/beam/sdk/options/StreamingOptions.html" title="interface in org.apache.beam.sdk.options">StreamingOptions</a>&nbsp;options)</code>
<div class="block">Analyse the pipeline to determine if we have to switch to streaming mode for the pipeline
translation and update <a href="../../../../../../../org/apache/beam/sdk/options/StreamingOptions.html" title="interface in org.apache.beam.sdk.options"><code>StreamingOptions</code></a> accordingly.</div>
</td>
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<tr id="i1" class="rowColor">
<td class="colFirst"><code>protected abstract &lt;InT extends <a href="../../../../../../../org/apache/beam/sdk/values/PInput.html" title="interface in org.apache.beam.sdk.values">PInput</a>,OutT extends <a href="../../../../../../../org/apache/beam/sdk/values/POutput.html" title="interface in org.apache.beam.sdk.values">POutput</a>,TransformT extends <a href="../../../../../../../org/apache/beam/sdk/transforms/PTransform.html" title="class in org.apache.beam.sdk.transforms">PTransform</a>&lt;InT,OutT&gt;&gt;<br><a href="../../../../../../../org/apache/beam/runners/spark/structuredstreaming/translation/TransformTranslator.html" title="class in org.apache.beam.runners.spark.structuredstreaming.translation">TransformTranslator</a>&lt;InT,OutT,TransformT&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/beam/runners/spark/structuredstreaming/translation/PipelineTranslator.html#getTransformTranslator-TransformT-">getTransformTranslator</a></span>(TransformT&nbsp;transform)</code>
<div class="block">Returns a <a href="../../../../../../../org/apache/beam/runners/spark/structuredstreaming/translation/TransformTranslator.html" title="class in org.apache.beam.runners.spark.structuredstreaming.translation"><code>TransformTranslator</code></a> for the given <a href="../../../../../../../org/apache/beam/sdk/transforms/PTransform.html" title="class in org.apache.beam.sdk.transforms"><code>PTransform</code></a> if known.</div>
</td>
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<tr id="i2" class="altColor">
<td class="colFirst"><code>static void</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/beam/runners/spark/structuredstreaming/translation/PipelineTranslator.html#replaceTransforms-org.apache.beam.sdk.Pipeline-org.apache.beam.sdk.options.StreamingOptions-">replaceTransforms</a></span>(<a href="../../../../../../../org/apache/beam/sdk/Pipeline.html" title="class in org.apache.beam.sdk">Pipeline</a>&nbsp;pipeline,
<a href="../../../../../../../org/apache/beam/sdk/options/StreamingOptions.html" title="interface in org.apache.beam.sdk.options">StreamingOptions</a>&nbsp;options)</code>&nbsp;</td>
</tr>
<tr id="i3" class="rowColor">
<td class="colFirst"><code><a href="../../../../../../../org/apache/beam/runners/spark/structuredstreaming/translation/EvaluationContext.html" title="class in org.apache.beam.runners.spark.structuredstreaming.translation">EvaluationContext</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/beam/runners/spark/structuredstreaming/translation/PipelineTranslator.html#translate-org.apache.beam.sdk.Pipeline-org.apache.spark.sql.SparkSession-org.apache.beam.runners.spark.SparkCommonPipelineOptions-">translate</a></span>(<a href="../../../../../../../org/apache/beam/sdk/Pipeline.html" title="class in org.apache.beam.sdk">Pipeline</a>&nbsp;pipeline,
org.apache.spark.sql.SparkSession&nbsp;session,
<a href="../../../../../../../org/apache/beam/runners/spark/SparkCommonPipelineOptions.html" title="interface in org.apache.beam.runners.spark">SparkCommonPipelineOptions</a>&nbsp;options)</code>
<div class="block">Translates a Beam pipeline into its Spark correspondence using the Spark SQL / Dataset API.</div>
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<h3>Methods inherited from class&nbsp;java.lang.Object</h3>
<code>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</code></li>
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<h4>PipelineTranslator</h4>
<pre>public&nbsp;PipelineTranslator()</pre>
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<h4>replaceTransforms</h4>
<pre>public static&nbsp;void&nbsp;replaceTransforms(<a href="../../../../../../../org/apache/beam/sdk/Pipeline.html" title="class in org.apache.beam.sdk">Pipeline</a>&nbsp;pipeline,
<a href="../../../../../../../org/apache/beam/sdk/options/StreamingOptions.html" title="interface in org.apache.beam.sdk.options">StreamingOptions</a>&nbsp;options)</pre>
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<h4>detectStreamingMode</h4>
<pre>public static&nbsp;void&nbsp;detectStreamingMode(<a href="../../../../../../../org/apache/beam/sdk/Pipeline.html" title="class in org.apache.beam.sdk">Pipeline</a>&nbsp;pipeline,
<a href="../../../../../../../org/apache/beam/sdk/options/StreamingOptions.html" title="interface in org.apache.beam.sdk.options">StreamingOptions</a>&nbsp;options)</pre>
<div class="block">Analyse the pipeline to determine if we have to switch to streaming mode for the pipeline
translation and update <a href="../../../../../../../org/apache/beam/sdk/options/StreamingOptions.html" title="interface in org.apache.beam.sdk.options"><code>StreamingOptions</code></a> accordingly.</div>
</li>
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<a name="getTransformTranslator-org.apache.beam.sdk.transforms.PTransform-">
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<h4>getTransformTranslator</h4>
<pre><a href="https://static.javadoc.io/com.google.code.findbugs/jsr305/3.0.2/javax/annotation/Nullable.html?is-external=true" title="class or interface in javax.annotation">@Nullable</a>
protected abstract&nbsp;&lt;InT extends <a href="../../../../../../../org/apache/beam/sdk/values/PInput.html" title="interface in org.apache.beam.sdk.values">PInput</a>,OutT extends <a href="../../../../../../../org/apache/beam/sdk/values/POutput.html" title="interface in org.apache.beam.sdk.values">POutput</a>,TransformT extends <a href="../../../../../../../org/apache/beam/sdk/transforms/PTransform.html" title="class in org.apache.beam.sdk.transforms">PTransform</a>&lt;InT,OutT&gt;&gt;&nbsp;<a href="../../../../../../../org/apache/beam/runners/spark/structuredstreaming/translation/TransformTranslator.html" title="class in org.apache.beam.runners.spark.structuredstreaming.translation">TransformTranslator</a>&lt;InT,OutT,TransformT&gt;&nbsp;getTransformTranslator(TransformT&nbsp;transform)</pre>
<div class="block">Returns a <a href="../../../../../../../org/apache/beam/runners/spark/structuredstreaming/translation/TransformTranslator.html" title="class in org.apache.beam.runners.spark.structuredstreaming.translation"><code>TransformTranslator</code></a> for the given <a href="../../../../../../../org/apache/beam/sdk/transforms/PTransform.html" title="class in org.apache.beam.sdk.transforms"><code>PTransform</code></a> if known.</div>
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<h4>translate</h4>
<pre>public&nbsp;<a href="../../../../../../../org/apache/beam/runners/spark/structuredstreaming/translation/EvaluationContext.html" title="class in org.apache.beam.runners.spark.structuredstreaming.translation">EvaluationContext</a>&nbsp;translate(<a href="../../../../../../../org/apache/beam/sdk/Pipeline.html" title="class in org.apache.beam.sdk">Pipeline</a>&nbsp;pipeline,
org.apache.spark.sql.SparkSession&nbsp;session,
<a href="../../../../../../../org/apache/beam/runners/spark/SparkCommonPipelineOptions.html" title="interface in org.apache.beam.runners.spark">SparkCommonPipelineOptions</a>&nbsp;options)</pre>
<div class="block">Translates a Beam pipeline into its Spark correspondence using the Spark SQL / Dataset API.
<p>Note, in some cases this involves the early evaluation of some parts of the pipeline. For
example, in order to use a side-input <a href="../../../../../../../org/apache/beam/sdk/values/PCollectionView.html" title="interface in org.apache.beam.sdk.values"><code>PCollectionView</code></a> in a translation the corresponding Spark <code>Dataset</code> might have to be collected and
broadcasted to be able to continue with the translation.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>The result of the translation is an <a href="../../../../../../../org/apache/beam/runners/spark/structuredstreaming/translation/EvaluationContext.html" title="class in org.apache.beam.runners.spark.structuredstreaming.translation"><code>EvaluationContext</code></a> that can trigger the
evaluation of the Spark pipeline.</dd>
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