branch-4.1: [improve](streaming-job) avoid potential OOM when reading large snapshot splits #63833#63883
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…hot splits (#63833) ## Summary - Default-skip flink-cdc's in-snapshot backfill on the from-to path so large splits no longer accumulate the entire chunk + backfill stream in the fetcher's outputBuffer; from-to is at-least-once and tolerates the duplicates this introduces. TVF (job-driven and standalone) keeps the standard `false` default for exactly-once via per-task offset commit. - Expose `skip_snapshot_backfill` as a user-facing property with strict `true`/`false` validation on both from-to (CREATE JOB) and TVF (SELECT FROM cdc_stream(...)) entry points. - Fix snapshot completion under `pollWithoutBuffer`: a split is now marked complete only after its high-watermark event has been consumed (`splitState.getHighWatermark() != null`), not on the first non-empty fetcher batch. Without this, enabling the new default truncates any split larger than debezium's `max.batch.size` and yields an NPE on offset extraction. - Read `streaming_task_timeout_multiplier` live in `StreamingMultiTblTask.isTimeout()` so `admin set frontend config` affects already-running tasks, matching the `@ConfField(mutable=true)` contract.
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yiguolei
approved these changes
May 30, 2026
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Cherry-picked from #63833