haseebmalik18 opened a new pull request, #67974:
URL: https://github.com/apache/airflow/pull/67974
Reserves the IPC channel and Java SDK API so JVM tasks can ship an opt-in
`lineage` payload back to Python listeners.
The supervisor adds an optional `lineage` field on `SucceedTask` and
`TaskState`, gated by a `Cadwyn` version change so the wire stays compatible
with older clients. `BaseCoordinator.on_lineage_received` re-emits the payload
through the listener manager as `on_lang_task_lineage_received`, and the Python
coordinator path leaves the `lineage_handler` unwired so existing tasks pay
nothing.
On the Java side, `Context.setLineage` and `Context.putLineage` give users
an opt-in builder. Tasks that never call them produce the same wire bytes as
before, which the existing byte-for-byte `CommTest` assertion still proves.
The OpenLineage provider listener does not yet consume
`on_lang_task_lineage_received`.
closes: #67111
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