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https://issues.apache.org/jira/browse/SPARK-56566?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jungtaek Lim reassigned SPARK-56566:
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Assignee: Jungtaek Lim
> ransformWithState silently drops user timers registered at or below the
> previous batch's lower bound
> ----------------------------------------------------------------------------------------------------
>
> Key: SPARK-56566
> URL: https://issues.apache.org/jira/browse/SPARK-56566
> Project: Spark
> Issue Type: Bug
> Components: Structured Streaming
> Affects Versions: 4.2.0
> Reporter: Jungtaek Lim
> Assignee: Jungtaek Lim
> Priority: Major
> Labels: pull-request-available
>
> (This is a correctness issue but the change is yet to be released, so just
> marked as major.)
>
> https://issues.apache.org/jira/browse/SPARK-56400 introduced a bounded
> rangeScan in TimerStateImpl.getExpiredTimers with an exclusive lower bound
> set from prevBatchTimestampMs (ProcessingTime) or
> eventTimeWatermarkForLateEvents (EventTime multi-op).
>
> This is based on the general invariant with stateful operator that we do not
> reuse the timestamp offset of state after we perform eviction, which is
> unfortunately not true. registerTimer has no guard on the registered expiry,
> so a user can legally call registerTimer(ts) with ts at or below that lower
> bound.
>
> In that case, the bounded scan excludes the entry, and because
> prevBatchTimestampMs / lateEventsWatermark are monotonically non-decreasing,
> the timer is never fired in any subsequent batch either — silently lost.
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