nikitagrover19 opened a new pull request, #37345:
URL: https://github.com/apache/beam/pull/37345
Fixes #36201
This PR fixes the `WriteToPubSub` transform in the Python SDK to properly
pass the `ordering_key` parameter to the Google Cloud Pub/Sub `publish()`
method.
**The Problem**
While the `ordering_key` field was correctly serialized into the
`PubsubMessage` protobuf, it was not being extracted and passed to
`PublisherClient.publish()` in the `_PubSubWriteDoFn._flush()` method. This
caused message ordering to not work even when users explicitly specified an
`ordering_key`.
**The Solution:**
Modified `_PubSubWriteDoFn._flush()` to:
- Extract `ordering_key` from the deserialized `PubsubMessage`
- Pass it to `publish()` in both code paths (with attributes and data-only)
- Handle empty/missing `ordering_key` for backward compatibility
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