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| <h2 title="Class UnboundedSource" class="title">Class UnboundedSource<OutputT,CheckpointMarkT extends <a href="../../../../../org/apache/beam/sdk/io/UnboundedSource.CheckpointMark.html" title="interface in org.apache.beam.sdk.io">UnboundedSource.CheckpointMark</a>></h2> |
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| <li>java.lang.Object</li> |
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| <li><a href="../../../../../org/apache/beam/sdk/io/Source.html" title="class in org.apache.beam.sdk.io">org.apache.beam.sdk.io.Source</a><OutputT></li> |
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| <ul class="inheritance"> |
| <li>org.apache.beam.sdk.io.UnboundedSource<OutputT,CheckpointMarkT></li> |
| </ul> |
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| <div class="description"> |
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| <dl> |
| <dt><span class="paramLabel">Type Parameters:</span></dt> |
| <dd><code>OutputT</code> - Type of records output by this source.</dd> |
| <dd><code>CheckpointMarkT</code> - Type of checkpoint marks used by the readers of this source.</dd> |
| </dl> |
| <dl> |
| <dt>All Implemented Interfaces:</dt> |
| <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> |
| </dl> |
| <hr> |
| <br> |
| <pre>public abstract class <span class="typeNameLabel">UnboundedSource<OutputT,CheckpointMarkT extends <a href="../../../../../org/apache/beam/sdk/io/UnboundedSource.CheckpointMark.html" title="interface in org.apache.beam.sdk.io">UnboundedSource.CheckpointMark</a>></span> |
| extends <a href="../../../../../org/apache/beam/sdk/io/Source.html" title="class in org.apache.beam.sdk.io">Source</a><OutputT></pre> |
| <div class="block">A <a href="../../../../../org/apache/beam/sdk/io/Source.html" title="class in org.apache.beam.sdk.io"><code>Source</code></a> that reads an unbounded amount of input and, because of that, supports some |
| additional operations such as checkpointing, watermarks, and record ids. |
| |
| <ul> |
| <li>Checkpointing allows sources to not re-read the same data again in the case of failures. |
| <li>Watermarks allow for downstream parts of the pipeline to know up to what point in time the |
| data is complete. |
| <li>Record ids allow for efficient deduplication of input records; many streaming sources do |
| not guarantee that a given record will only be read a single time. |
| </ul> |
| |
| <p>See <a href="../../../../../org/apache/beam/sdk/transforms/windowing/Window.html" title="class in org.apache.beam.sdk.transforms.windowing"><code>Window</code></a> and <a href="../../../../../org/apache/beam/sdk/transforms/windowing/Trigger.html" title="class in org.apache.beam.sdk.transforms.windowing"><code>Trigger</code></a> for more information on timestamps and |
| watermarks.</div> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../../serialized-form.html#org.apache.beam.sdk.io.UnboundedSource">Serialized Form</a></dd> |
| </dl> |
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| <caption><span>Nested Classes</span><span class="tabEnd"> </span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Class and Description</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>static interface </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/io/UnboundedSource.CheckpointMark.html" title="interface in org.apache.beam.sdk.io">UnboundedSource.CheckpointMark</a></span></code> |
| <div class="block">A marker representing the progress and state of an <a href="../../../../../org/apache/beam/sdk/io/UnboundedSource.UnboundedReader.html" title="class in org.apache.beam.sdk.io"><code>UnboundedSource.UnboundedReader</code></a>.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>static class </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/io/UnboundedSource.UnboundedReader.html" title="class in org.apache.beam.sdk.io">UnboundedSource.UnboundedReader</a><<a href="../../../../../org/apache/beam/sdk/io/UnboundedSource.UnboundedReader.html" title="type parameter in UnboundedSource.UnboundedReader">OutputT</a>></span></code> |
| <div class="block">A <code>Reader</code> that reads an unbounded amount of input.</div> |
| </td> |
| </tr> |
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| <h3>Nested classes/interfaces inherited from class org.apache.beam.sdk.io.<a href="../../../../../org/apache/beam/sdk/io/Source.html" title="class in org.apache.beam.sdk.io">Source</a></h3> |
| <code><a href="../../../../../org/apache/beam/sdk/io/Source.Reader.html" title="class in org.apache.beam.sdk.io">Source.Reader</a><<a href="../../../../../org/apache/beam/sdk/io/Source.Reader.html" title="type parameter in Source.Reader">T</a>></code></li> |
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| <tr class="altColor"> |
| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/io/UnboundedSource.html#UnboundedSource--">UnboundedSource</a></span>()</code> </td> |
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| <h3>Method Summary</h3> |
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| <caption><span id="t0" class="activeTableTab"><span>All Methods</span><span class="tabEnd"> </span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">Instance Methods</a></span><span class="tabEnd"> </span></span><span id="t3" class="tableTab"><span><a href="javascript:show(4);">Abstract Methods</a></span><span class="tabEnd"> </span></span><span id="t4" class="tableTab"><span><a href="javascript:show(8);">Concrete Methods</a></span><span class="tabEnd"> </span></span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
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| </tr> |
| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code>abstract <a href="../../../../../org/apache/beam/sdk/io/UnboundedSource.UnboundedReader.html" title="class in org.apache.beam.sdk.io">UnboundedSource.UnboundedReader</a><<a href="../../../../../org/apache/beam/sdk/io/UnboundedSource.html" title="type parameter in UnboundedSource">OutputT</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/io/UnboundedSource.html#createReader-org.apache.beam.sdk.options.PipelineOptions-CheckpointMarkT-">createReader</a></span>(<a href="../../../../../org/apache/beam/sdk/options/PipelineOptions.html" title="interface in org.apache.beam.sdk.options">PipelineOptions</a> options, |
| <a href="../../../../../org/apache/beam/sdk/io/UnboundedSource.html" title="type parameter in UnboundedSource">CheckpointMarkT</a> checkpointMark)</code> |
| <div class="block">Create a new <a href="../../../../../org/apache/beam/sdk/io/UnboundedSource.UnboundedReader.html" title="class in org.apache.beam.sdk.io"><code>UnboundedSource.UnboundedReader</code></a> to read from this source, resuming from the given |
| checkpoint if present.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>abstract <a href="../../../../../org/apache/beam/sdk/coders/Coder.html" title="class in org.apache.beam.sdk.coders">Coder</a><<a href="../../../../../org/apache/beam/sdk/io/UnboundedSource.html" title="type parameter in UnboundedSource">CheckpointMarkT</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/io/UnboundedSource.html#getCheckpointMarkCoder--">getCheckpointMarkCoder</a></span>()</code> |
| <div class="block">Returns a <a href="../../../../../org/apache/beam/sdk/coders/Coder.html" title="class in org.apache.beam.sdk.coders"><code>Coder</code></a> for encoding and decoding the checkpoints for this source.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/io/UnboundedSource.html#requiresDeduping--">requiresDeduping</a></span>()</code> |
| <div class="block">Returns whether this source requires explicit deduping.</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>abstract java.util.List<? extends <a href="../../../../../org/apache/beam/sdk/io/UnboundedSource.html" title="class in org.apache.beam.sdk.io">UnboundedSource</a><<a href="../../../../../org/apache/beam/sdk/io/UnboundedSource.html" title="type parameter in UnboundedSource">OutputT</a>,<a href="../../../../../org/apache/beam/sdk/io/UnboundedSource.html" title="type parameter in UnboundedSource">CheckpointMarkT</a>>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/io/UnboundedSource.html#split-int-org.apache.beam.sdk.options.PipelineOptions-">split</a></span>(int desiredNumSplits, |
| <a href="../../../../../org/apache/beam/sdk/options/PipelineOptions.html" title="interface in org.apache.beam.sdk.options">PipelineOptions</a> options)</code> |
| <div class="block">Returns a list of <code>UnboundedSource</code> objects representing the instances of this source |
| that should be used when executing the workflow.</div> |
| </td> |
| </tr> |
| </table> |
| <ul class="blockList"> |
| <li class="blockList"><a name="methods.inherited.from.class.org.apache.beam.sdk.io.Source"> |
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| </a> |
| <h3>Methods inherited from class org.apache.beam.sdk.io.<a href="../../../../../org/apache/beam/sdk/io/Source.html" title="class in org.apache.beam.sdk.io">Source</a></h3> |
| <code><a href="../../../../../org/apache/beam/sdk/io/Source.html#getDefaultOutputCoder--">getDefaultOutputCoder</a>, <a href="../../../../../org/apache/beam/sdk/io/Source.html#getOutputCoder--">getOutputCoder</a>, <a href="../../../../../org/apache/beam/sdk/io/Source.html#populateDisplayData-org.apache.beam.sdk.transforms.display.DisplayData.Builder-">populateDisplayData</a>, <a href="../../../../../org/apache/beam/sdk/io/Source.html#validate--">validate</a></code></li> |
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| <code>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</code></li> |
| </ul> |
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| <h4>UnboundedSource</h4> |
| <pre>public UnboundedSource()</pre> |
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| <h4>split</h4> |
| <pre>public abstract java.util.List<? extends <a href="../../../../../org/apache/beam/sdk/io/UnboundedSource.html" title="class in org.apache.beam.sdk.io">UnboundedSource</a><<a href="../../../../../org/apache/beam/sdk/io/UnboundedSource.html" title="type parameter in UnboundedSource">OutputT</a>,<a href="../../../../../org/apache/beam/sdk/io/UnboundedSource.html" title="type parameter in UnboundedSource">CheckpointMarkT</a>>> split(int desiredNumSplits, |
| <a href="../../../../../org/apache/beam/sdk/options/PipelineOptions.html" title="interface in org.apache.beam.sdk.options">PipelineOptions</a> options) |
| throws java.lang.Exception</pre> |
| <div class="block">Returns a list of <code>UnboundedSource</code> objects representing the instances of this source |
| that should be used when executing the workflow. Each split should return a separate partition |
| of the input data. |
| |
| <p>For example, for a source reading from a growing directory of files, each split could |
| correspond to a prefix of file names. |
| |
| <p>Some sources are not splittable, such as reading from a single TCP stream. In that case, |
| only a single split should be returned. |
| |
| <p>Some data sources automatically partition their data among readers. For these types of |
| inputs, <code>n</code> identical replicas of the top-level source can be returned. |
| |
| <p>The size of the returned list should be as close to <code>desiredNumSplits</code> as possible, |
| but does not have to match exactly. A low number of splits will limit the amount of parallelism |
| in the source.</div> |
| <dl> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code>java.lang.Exception</code></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="createReader-org.apache.beam.sdk.options.PipelineOptions-org.apache.beam.sdk.io.UnboundedSource.CheckpointMark-"> |
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| </a><a name="createReader-org.apache.beam.sdk.options.PipelineOptions-CheckpointMarkT-"> |
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| <h4>createReader</h4> |
| <pre>public abstract <a href="../../../../../org/apache/beam/sdk/io/UnboundedSource.UnboundedReader.html" title="class in org.apache.beam.sdk.io">UnboundedSource.UnboundedReader</a><<a href="../../../../../org/apache/beam/sdk/io/UnboundedSource.html" title="type parameter in UnboundedSource">OutputT</a>> createReader(<a href="../../../../../org/apache/beam/sdk/options/PipelineOptions.html" title="interface in org.apache.beam.sdk.options">PipelineOptions</a> options, |
| <a href="../../../../../org/apache/beam/sdk/io/UnboundedSource.html" title="type parameter in UnboundedSource">CheckpointMarkT</a> checkpointMark) |
| throws java.io.IOException</pre> |
| <div class="block">Create a new <a href="../../../../../org/apache/beam/sdk/io/UnboundedSource.UnboundedReader.html" title="class in org.apache.beam.sdk.io"><code>UnboundedSource.UnboundedReader</code></a> to read from this source, resuming from the given |
| checkpoint if present.</div> |
| <dl> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code>java.io.IOException</code></dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="getCheckpointMarkCoder--"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>getCheckpointMarkCoder</h4> |
| <pre>public abstract <a href="../../../../../org/apache/beam/sdk/coders/Coder.html" title="class in org.apache.beam.sdk.coders">Coder</a><<a href="../../../../../org/apache/beam/sdk/io/UnboundedSource.html" title="type parameter in UnboundedSource">CheckpointMarkT</a>> getCheckpointMarkCoder()</pre> |
| <div class="block">Returns a <a href="../../../../../org/apache/beam/sdk/coders/Coder.html" title="class in org.apache.beam.sdk.coders"><code>Coder</code></a> for encoding and decoding the checkpoints for this source.</div> |
| </li> |
| </ul> |
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| </a> |
| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>requiresDeduping</h4> |
| <pre>public boolean requiresDeduping()</pre> |
| <div class="block">Returns whether this source requires explicit deduping. |
| |
| <p>This is needed if the underlying data source can return the same record multiple times, such |
| a queuing system with a pull-ack model. Sources where the records read are uniquely identified |
| by the persisted state in the CheckpointMark do not need this. |
| |
| <p>Generally, if <a href="../../../../../org/apache/beam/sdk/io/UnboundedSource.CheckpointMark.html#finalizeCheckpoint--"><code>UnboundedSource.CheckpointMark.finalizeCheckpoint()</code></a> is overridden, this method should |
| return true. Checkpoint finalization is best-effort, and readers can be resumed from a |
| checkpoint that has not been finalized.</div> |
| </li> |
| </ul> |
| </li> |
| </ul> |
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