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| <div class="subTitle">org.apache.beam.runners.spark.io</div> |
| <h2 title="Class SparkUnboundedSource" class="title">Class SparkUnboundedSource</h2> |
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| <ul class="inheritance"> |
| <li>java.lang.Object</li> |
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| <li>org.apache.beam.runners.spark.io.SparkUnboundedSource</li> |
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| <pre>public class <span class="typeNameLabel">SparkUnboundedSource</span> |
| extends java.lang.Object</pre> |
| <div class="block">A "composite" InputDStream implementation for <a href="../../../../../../org/apache/beam/sdk/io/UnboundedSource.html" title="class in org.apache.beam.sdk.io"><code>UnboundedSource</code></a>s. |
| |
| <p>This read is a composite of the following steps: |
| |
| <ul> |
| <li>Create a single-element (per-partition) stream, that contains the (partitioned) <a href="../../../../../../org/apache/beam/sdk/io/Source.html" title="class in org.apache.beam.sdk.io"><code>Source</code></a> and an optional <a href="../../../../../../org/apache/beam/sdk/io/UnboundedSource.CheckpointMark.html" title="interface in org.apache.beam.sdk.io"><code>UnboundedSource.CheckpointMark</code></a> to start from. |
| <li>Read from within a stateful operation <code>JavaPairDStream.mapWithState(StateSpec)</code> |
| using the <a href="../../../../../../org/apache/beam/runners/spark/stateful/StateSpecFunctions.html#mapSourceFunction-org.apache.beam.runners.core.construction.SerializablePipelineOptions-java.lang.String-"><code>StateSpecFunctions.mapSourceFunction(org.apache.beam.runners.core.construction.SerializablePipelineOptions, java.lang.String)</code></a> mapping function, which manages the |
| state of the CheckpointMark per partition. |
| <li>Since the stateful operation is a map operation, the read iterator needs to be flattened, |
| while reporting the properties of the read (such as number of records) to the tracker. |
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| <td class="colFirst"><code>static class </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/runners/spark/io/SparkUnboundedSource.Metadata.html" title="class in org.apache.beam.runners.spark.io">SparkUnboundedSource.Metadata</a></span></code> |
| <div class="block">A metadata holder for an input stream partition.</div> |
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| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/runners/spark/io/SparkUnboundedSource.html#SparkUnboundedSource--">SparkUnboundedSource</a></span>()</code> </td> |
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| <td class="colFirst"><code>static <T,CheckpointMarkT extends <a href="../../../../../../org/apache/beam/sdk/io/UnboundedSource.CheckpointMark.html" title="interface in org.apache.beam.sdk.io">UnboundedSource.CheckpointMark</a>><br><any></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/runners/spark/io/SparkUnboundedSource.html#read-org.apache.spark.streaming.api.java.JavaStreamingContext-org.apache.beam.runners.core.construction.SerializablePipelineOptions-org.apache.beam.sdk.io.UnboundedSource-java.lang.String-">read</a></span>(org.apache.spark.streaming.api.java.JavaStreamingContext jssc, |
| org.apache.beam.runners.core.construction.SerializablePipelineOptions rc, |
| <a href="../../../../../../org/apache/beam/sdk/io/UnboundedSource.html" title="class in org.apache.beam.sdk.io">UnboundedSource</a><T,CheckpointMarkT> source, |
| java.lang.String stepName)</code> </td> |
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| <h4>SparkUnboundedSource</h4> |
| <pre>public SparkUnboundedSource()</pre> |
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| <pre>public static <T,CheckpointMarkT extends <a href="../../../../../../org/apache/beam/sdk/io/UnboundedSource.CheckpointMark.html" title="interface in org.apache.beam.sdk.io">UnboundedSource.CheckpointMark</a>> <any> read(org.apache.spark.streaming.api.java.JavaStreamingContext jssc, |
| org.apache.beam.runners.core.construction.SerializablePipelineOptions rc, |
| <a href="../../../../../../org/apache/beam/sdk/io/UnboundedSource.html" title="class in org.apache.beam.sdk.io">UnboundedSource</a><T,CheckpointMarkT> source, |
| java.lang.String stepName)</pre> |
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