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https://issues.apache.org/jira/browse/SPARK-60359?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jungtaek Lim updated SPARK-60359:
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Affects Version/s: 4.4.0
(was: 5.0.0)
> EvictionIterator removes state rows in hasNext instead of next
> --------------------------------------------------------------
>
> Key: SPARK-60359
> URL: https://issues.apache.org/jira/browse/SPARK-60359
> Project: Spark
> Issue Type: Bug
> Components: Structured Streaming
> Affects Versions: 4.4.0
> Reporter: Min Yang
> Assignee: Min Yang
> Priority: Major
> Labels: pull-request-available
>
> EvictionIterator (used by StreamingAggregationStateManager.evictionIterator
> and StatefulStreamlineAggregateExec) removes an evictable row from the state
> store, and increments numRowsRemovedSoFar, inside hasNext. A caller that
> calls hasNext without a matching next() therefore deletes a row it never
> received.
> Consequences:
> - Append mode emits evicted rows and counts numRowsRemovedSoFar as
> numOutputRows. If the consumer stops after a hasNext probe, the probed row is
> deleted from state but never emitted, and is still counted as output.
> - Update mode incremental cleanup has to re-check its removal budget before
> every hasNext to avoid removing one extra row per input.
> The iterator should only find the next evictable row in hasNext, and remove
> it (and update the metric) when next() returns it.
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