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| <html> |
| <h2>Adding Timestamp - ParDo</h2> |
| <p> |
| Bounded sources (such as a file from TextIO) do not provide timestamps for elements. If you need |
| timestamps, you must add them to your PCollection’s elements. |
| </p> |
| <p> |
| You can assign new timestamps to the elements of a PCollection by applying a ParDo transform that |
| outputs new elements with timestamps that you set. |
| </p> |
| <p> |
| <b>Kata:</b> Please assign each element a timestamp based on the the <code>Event.getDate()</code>. |
| </p> |
| <br> |
| <div class="hint"> |
| Use <a href="https://beam.apache.org/releases/javadoc/current/org/apache/beam/sdk/transforms/ParDo.html"> |
| ParDo</a> |
| with <a href="https://beam.apache.org/releases/javadoc/current/org/apache/beam/sdk/transforms/DoFn.html"> |
| DoFn</a>. |
| </div> |
| <div class="hint"> |
| Use <a href="https://beam.apache.org/releases/javadoc/current/org/apache/beam/sdk/transforms/DoFn.OutputReceiver.html#outputWithTimestamp-T-org.joda.time.Instant-"> |
| OutputReceiver.outputWithTimestamp</a> method to assign timestamp to the element. |
| </div> |
| <div class="hint"> |
| Refer to the Beam Programming Guide |
| <a href="https://beam.apache.org/documentation/programming-guide/#adding-timestamps-to-a-pcollections-elements"> |
| "Adding timestamps to a PCollection’s elements"</a> section for more information. |
| </div> |
| </html> |
