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| <h2 title="Interface UnboundedSource.CheckpointMark" class="title">Interface UnboundedSource.CheckpointMark</h2> |
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| <dd><a href="../../../../../org/apache/beam/sdk/io/CountingSource.CounterMark.html" title="class in org.apache.beam.sdk.io">CountingSource.CounterMark</a>, <a href="../../../../../org/apache/beam/runners/spark/io/EmptyCheckpointMark.html" title="class in org.apache.beam.runners.spark.io">EmptyCheckpointMark</a>, <a href="../../../../../org/apache/beam/sdk/io/jms/JmsCheckpointMark.html" title="class in org.apache.beam.sdk.io.jms">JmsCheckpointMark</a>, <a href="../../../../../org/apache/beam/sdk/io/kafka/KafkaCheckpointMark.html" title="class in org.apache.beam.sdk.io.kafka">KafkaCheckpointMark</a>, <a href="../../../../../org/apache/beam/sdk/io/UnboundedSource.CheckpointMark.NoopCheckpointMark.html" title="class in org.apache.beam.sdk.io">UnboundedSource.CheckpointMark.NoopCheckpointMark</a></dd> |
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| <dd><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> extends <a href="../../../../../org/apache/beam/sdk/io/UnboundedSource.CheckpointMark.html" title="interface in org.apache.beam.sdk.io">UnboundedSource.CheckpointMark</a>></dd> |
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| <pre>public static interface <span class="typeNameLabel">UnboundedSource.CheckpointMark</span></pre> |
| <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>. |
| |
| <p>For example, this could be offsets in a set of files being read.</div> |
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| <td class="colFirst"><code>static class </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/io/UnboundedSource.CheckpointMark.NoopCheckpointMark.html" title="class in org.apache.beam.sdk.io">UnboundedSource.CheckpointMark.NoopCheckpointMark</a></span></code> |
| <div class="block">A checkpoint mark that does nothing when finalized.</div> |
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| <td class="colFirst"><code>static <a href="../../../../../org/apache/beam/sdk/io/UnboundedSource.CheckpointMark.NoopCheckpointMark.html" title="class in org.apache.beam.sdk.io">UnboundedSource.CheckpointMark.NoopCheckpointMark</a></code></td> |
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| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/io/UnboundedSource.CheckpointMark.html#finalizeCheckpoint--">finalizeCheckpoint</a></span>()</code> |
| <div class="block">Called by the system to signal that this checkpoint mark has been committed along with all |
| the records which have been read from the <a href="../../../../../org/apache/beam/sdk/io/UnboundedSource.UnboundedReader.html" title="class in org.apache.beam.sdk.io"><code>UnboundedSource.UnboundedReader</code></a> since the previous |
| checkpoint was taken.</div> |
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| <h4>NOOP_CHECKPOINT_MARK</h4> |
| <pre>static final <a href="../../../../../org/apache/beam/sdk/io/UnboundedSource.CheckpointMark.NoopCheckpointMark.html" title="class in org.apache.beam.sdk.io">UnboundedSource.CheckpointMark.NoopCheckpointMark</a> NOOP_CHECKPOINT_MARK</pre> |
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| <h4>finalizeCheckpoint</h4> |
| <pre>void finalizeCheckpoint() |
| throws java.io.IOException</pre> |
| <div class="block">Called by the system to signal that this checkpoint mark has been committed along with all |
| the records which have been read from the <a href="../../../../../org/apache/beam/sdk/io/UnboundedSource.UnboundedReader.html" title="class in org.apache.beam.sdk.io"><code>UnboundedSource.UnboundedReader</code></a> since the previous |
| checkpoint was taken. |
| |
| <p>For example, this method could send acknowledgements to an external data source such as |
| Pubsub. |
| |
| <p>Note that: |
| |
| <ul> |
| <li>This finalize method may be called from any thread, concurrently with calls to the |
| <a href="../../../../../org/apache/beam/sdk/io/UnboundedSource.UnboundedReader.html" title="class in org.apache.beam.sdk.io"><code>UnboundedSource.UnboundedReader</code></a> it was created from. |
| <li>Checkpoints will not necessarily be finalized as soon as they are created. A checkpoint |
| may be taken while a previous checkpoint from the same <a href="../../../../../org/apache/beam/sdk/io/UnboundedSource.UnboundedReader.html" title="class in org.apache.beam.sdk.io"><code>UnboundedSource.UnboundedReader</code></a> has not |
| yet be finalized. |
| <li>In the absence of failures, all checkpoints will be finalized and they will be |
| finalized in the same order they were taken from the <a href="../../../../../org/apache/beam/sdk/io/UnboundedSource.UnboundedReader.html" title="class in org.apache.beam.sdk.io"><code>UnboundedSource.UnboundedReader</code></a>. |
| <li>It is possible for a checkpoint to be taken but this method never called. This method |
| will never be called if the checkpoint could not be committed, and other failures may |
| cause this method to never be called. |
| <li>It is not safe to assume the <a href="../../../../../org/apache/beam/sdk/io/UnboundedSource.UnboundedReader.html" title="class in org.apache.beam.sdk.io"><code>UnboundedSource.UnboundedReader</code></a> from which this checkpoint was |
| created still exists at the time this method is called. |
| </ul></div> |
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| <dd><code>java.io.IOException</code></dd> |
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