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https://issues.apache.org/jira/browse/FLINK-41254?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated FLINK-41254:
-----------------------------------
Labels: pull-request-available (was: )
> Two-phase window aggregation loses buffered records when a source subtask
> becomes idle
> --------------------------------------------------------------------------------------
>
> Key: FLINK-41254
> URL: https://issues.apache.org/jira/browse/FLINK-41254
> Project: Flink
> Issue Type: Bug
> Components: Table SQL / Runtime
> Reporter: Mate Czagany
> Priority: Major
> Labels: pull-request-available
>
> Two-phase event-time window aggregation produces wrong results when a source
> subtask receives records and then becomes idle.
> LocalSlicingWindowAggOperator holds pre-aggregates in-memory and flushes it
> only when its subtask's watermark passes the slice end, or in
> prepareSnapshotPreBarrier. When the chained source emits
> WatermarkStatus.IDLE, the
> subtask's watermark stops advancing, so the buffer is never flushed. The
> global operator excludes the idle channel, advances on the remaining
> subtasks, and fires the window.
> More info can be found here:
> [https://lists.apache.org/thread/128qfwtdgtj6yfhftkj7r15polqqz6mn]
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