tkaymak opened a new issue, #40446: URL: https://github.com/apache/beam/issues/40446
### What needs to happen? The Spark 4 Structured Streaming stateful ParDo filters late data against the watermark stored on the key's previous visit, so a key on its first visit or idle for several batches accepts data that a per batch bound would drop. Spark holds the per batch value as `eventTimeWatermarkForLateEvents` in `TransformWithStateExec`, but `StatefulProcessor` only sees the eviction watermark through `TimerValues`. Tighten the bound once Spark exposes the late events watermark, or by tracking the previous batch watermark outside keyed state. Part of #36841. ### Issue Priority Priority: 3 (nice-to-have improvement) ### Issue Components - [x] Component: Spark Runner -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
