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| <div class="subTitle">org.apache.beam.sdk.transforms.windowing</div> |
| <h2 title="Class AfterWatermark" class="title">Class AfterWatermark</h2> |
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| <li>org.apache.beam.sdk.transforms.windowing.AfterWatermark</li> |
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| <pre><a href="../../../../../../org/apache/beam/sdk/annotations/Experimental.html" title="annotation in org.apache.beam.sdk.annotations">@Experimental</a>(<a href="../../../../../../org/apache/beam/sdk/annotations/Experimental.html#value--">value</a>=<a href="../../../../../../org/apache/beam/sdk/annotations/Experimental.Kind.html#TRIGGER">TRIGGER</a>) |
| public class <span class="typeNameLabel">AfterWatermark</span> |
| extends java.lang.Object</pre> |
| <div class="block"><code>AfterWatermark</code> triggers fire based on progress of the system watermark. This time is a |
| lower-bound, sometimes heuristically established, on event times that have been fully processed |
| by the pipeline. |
| |
| <p>For sources that provide non-heuristic watermarks (e.g. PubsubIO when using arrival times as |
| event times), the watermark is a strict guarantee that no data with an event time earlier than |
| that watermark will ever be observed in the pipeline. In this case, it's safe to assume that any |
| pane triggered by an <code>AfterWatermark</code> trigger with a reference point at or beyond the end |
| of the window will be the last pane ever for that window. |
| |
| <p>For sources that provide heuristic watermarks (e.g. PubsubIO when using user-supplied event |
| times), the watermark itself becomes an <i>estimate</i> that no data with an event time earlier |
| than that watermark (i.e. "late data") will ever be observed in the pipeline. These heuristics |
| can often be quite accurate, but the chance of seeing late data for any given window is non-zero. |
| Thus, if absolute correctness over time is important to your use case, you may want to consider |
| using a trigger that accounts for late data. The default trigger, <code>Repeatedly.forever(AfterWatermark.pastEndOfWindow())</code>, which fires once when the watermark passes |
| the end of the window and then immediately therafter when any late data arrives, is one such |
| example. |
| |
| <p>The watermark is the clock that defines <a href="../../../../../../org/apache/beam/sdk/state/TimeDomain.html#EVENT_TIME"><code>TimeDomain.EVENT_TIME</code></a>. |
| |
| <p>Additionaly firings before or after the watermark can be requested by calling <code>AfterWatermark.pastEndOfWindow.withEarlyFirings(OnceTrigger)</code> or <code>AfterWatermark.pastEndOfWindow.withLateFirings(OnceTrigger)</code>.</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/transforms/windowing/AfterWatermark.AfterWatermarkEarlyAndLate.html" title="class in org.apache.beam.sdk.transforms.windowing">AfterWatermark.AfterWatermarkEarlyAndLate</a></span></code> </td> |
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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/transforms/windowing/AfterWatermark.FromEndOfWindow.html" title="class in org.apache.beam.sdk.transforms.windowing">AfterWatermark.FromEndOfWindow</a></span></code> |
| <div class="block">A watermark trigger targeted relative to the end of the window.</div> |
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| <td class="colFirst"><code>static <a href="../../../../../../org/apache/beam/sdk/transforms/windowing/AfterWatermark.FromEndOfWindow.html" title="class in org.apache.beam.sdk.transforms.windowing">AfterWatermark.FromEndOfWindow</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../org/apache/beam/sdk/transforms/windowing/AfterWatermark.html#pastEndOfWindow--">pastEndOfWindow</a></span>()</code> |
| <div class="block">Creates a trigger that fires when the watermark passes the end of the window.</div> |
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| <h4>pastEndOfWindow</h4> |
| <pre>public static <a href="../../../../../../org/apache/beam/sdk/transforms/windowing/AfterWatermark.FromEndOfWindow.html" title="class in org.apache.beam.sdk.transforms.windowing">AfterWatermark.FromEndOfWindow</a> pastEndOfWindow()</pre> |
| <div class="block">Creates a trigger that fires when the watermark passes the end of the window.</div> |
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