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| |
| Adding Timestamp - ParDo |
| ------------------------ |
| |
| 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. |
| |
| 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. |
| |
| **Kata:** Please assign each element a timestamp based on the `Event.timestamp`. |
| |
| <div class="hint"> |
| Use <a href="https://beam.apache.org/releases/pydoc/current/apache_beam.transforms.core.html#apache_beam.transforms.core.ParDo"> |
| ParDo</a> with |
| <a href="https://beam.apache.org/releases/pydoc/current/apache_beam.transforms.core.html#apache_beam.transforms.core.DoFn">DoFn</a>. |
| </div> |
| |
| <div class="hint"> |
| Use <a href="https://beam.apache.org/releases/pydoc/current/apache_beam.transforms.window.html#apache_beam.transforms.window.TimestampedValue"> |
| beam.transforms.window.TimestampedValue</a> 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> |
