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| <h2 title="Interface DoFn.BundleFinalizer" class="title">Interface DoFn.BundleFinalizer</h2> |
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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#SPLITTABLE_DO_FN">SPLITTABLE_DO_FN</a>) |
| public static interface <span class="typeNameLabel">DoFn.BundleFinalizer</span></pre> |
| <div class="block">A parameter that is accessible during <a href="../../../../../org/apache/beam/sdk/transforms/DoFn.StartBundle.html" title="annotation in org.apache.beam.sdk.transforms"><code>@StartBundle</code></a>, <a href="../../../../../org/apache/beam/sdk/transforms/DoFn.ProcessElement.html" title="annotation in org.apache.beam.sdk.transforms"><code>@ProcessElement</code></a> and <a href="../../../../../org/apache/beam/sdk/transforms/DoFn.FinishBundle.html" title="annotation in org.apache.beam.sdk.transforms"><code>@FinishBundle</code></a> that allows the caller |
| to register a callback that will be invoked after the bundle has been successfully completed |
| and the runner has commit the output. |
| |
| <p>A common usage would be to perform any acknowledgements required by an external system such |
| as acking messages from a message queue since this callback is only invoked after the output of |
| the bundle has been durably persisted by the runner. |
| |
| <p>Note that a runner may make the output of the bundle available immediately to downstream |
| consumers without waiting for finalization to succeed. For pipelines that are sensitive to |
| duplicate messages, they must perform output deduplication in the pipeline.</div> |
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| <td class="colFirst"><code>static interface </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/transforms/DoFn.BundleFinalizer.Callback.html" title="interface in org.apache.beam.sdk.transforms">DoFn.BundleFinalizer.Callback</a></span></code> |
| <div class="block">An instance of a function that will be invoked after bundle finalization.</div> |
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| <td class="colFirst"><code>void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/beam/sdk/transforms/DoFn.BundleFinalizer.html#afterBundleCommit-org.joda.time.Instant-org.apache.beam.sdk.transforms.DoFn.BundleFinalizer.Callback-">afterBundleCommit</a></span>(<a href="https://static.javadoc.io/joda-time/joda-time/2.10.1/org/joda/time/Instant.html?is-external=true" title="class or interface in org.joda.time">Instant</a> callbackExpiry, |
| <a href="../../../../../org/apache/beam/sdk/transforms/DoFn.BundleFinalizer.Callback.html" title="interface in org.apache.beam.sdk.transforms">DoFn.BundleFinalizer.Callback</a> callback)</code> |
| <div class="block">The provided function will be called after the runner successfully commits the output of a |
| successful bundle.</div> |
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| <h4>afterBundleCommit</h4> |
| <pre>void afterBundleCommit(<a href="https://static.javadoc.io/joda-time/joda-time/2.10.1/org/joda/time/Instant.html?is-external=true" title="class or interface in org.joda.time">Instant</a> callbackExpiry, |
| <a href="../../../../../org/apache/beam/sdk/transforms/DoFn.BundleFinalizer.Callback.html" title="interface in org.apache.beam.sdk.transforms">DoFn.BundleFinalizer.Callback</a> callback)</pre> |
| <div class="block">The provided function will be called after the runner successfully commits the output of a |
| successful bundle. Throwing during finalization represents that bundle finalization may have |
| failed and the runner may choose to attempt finalization again. The provided <code>callbackExpiry</code> controls how long the finalization is valid for before it is garbage |
| collected and no longer able to be invoked. |
| |
| <p>Note that finalization is best effort and it is expected that the external system will |
| self recover state if finalization never happens or consistently fails. For example, a queue |
| based system that requires message acknowledgement would replay messages if that |
| acknowledgement was never received within the provided time bound. |
| |
| <p>See <a href="https://s.apache.org/beam-finalizing-bundles">Apache Beam Portability API: |
| How to Finalize Bundles</a> for further details.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>callbackExpiry</code> - When the finalization callback expires. If the runner cannot commit |
| results and execute the callback within this duration, the callback will not be invoked.</dd> |
| <dd><code>callback</code> - The finalization callback method for the runner to invoke after processing |
| results have been successfully committed.</dd> |
| </dl> |
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