[FLINK-40552][runtime] Support asynchronous transform execution - #4526
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September 8, 2026 02:16
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Thanks Haruki for the contribution!
Could you please add IT / E2e cases to cover this feature? Currently there are merely 2 unit tests. For simplicity we may make current transform e2e cases parameterized.
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| private static void drainMailbox(OneInputStreamOperatorTestHarness<Event, Event> harness) | ||
| throws Exception { | ||
| while (true) { | ||
| Mail mail = harness.getTaskMailbox().tryTake(TaskMailbox.MIN_PRIORITY).orElse(null); | ||
| if (mail == null) { | ||
| return; | ||
| } | ||
| mail.run(); | ||
| } | ||
| } |
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This test case seems too low-level and artificial. Replacing it with some IT cases might work better?
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CI is failing. Mind you take a look? |
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The CI failure was caused by an outdated validation call that had already been removed by FLINK-40572. The branch has now been rebased and the stale call has been removed. |
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Kindly ping @lvyanquan and @haruki-830, just resolved some conflicts. |
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What is the purpose of this pull request?
JIRA: https://issues.apache.org/jira/browse/FLINK-40552
This PR introduces opt-in ordered asynchronous execution for post-transform processing. It improves the throughput of I/O-bound transform expressions, such as AI model calls, while preserving CDC event ordering and schema consistency.
Brief change log
PostTransformProcessorfor both synchronous and asynchronous execution.DataChangeEvents can execute concurrently while outputs remain ordered.SchemaChangeEvents as barriers to preserve schema/data ordering.CreateTableEventonly once before subsequent data events.Verifying this change
This change added unit tests covering:
CreateTableEvent.Documentation
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