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https://issues.apache.org/jira/browse/SPARK-50046?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jungtaek Lim reassigned SPARK-50046:
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Assignee: Jungtaek Lim
> [Possible bug] Incorrect watermark advancement if watermark node is
> lost/pruned
> -------------------------------------------------------------------------------
>
> Key: SPARK-50046
> URL: https://issues.apache.org/jira/browse/SPARK-50046
> Project: Spark
> Issue Type: Bug
> Components: Structured Streaming
> Affects Versions: 4.0.0
> Reporter: Jungtaek Lim
> Assignee: Jungtaek Lim
> Priority: Major
> Labels: pull-request-available
>
> This does not happen in current optimization rules, but it was mostly a luck
> and we were silently dropping CollectMetrics node, hence it'd be ideal to
> address the issue in prior.
> WatermarkTracker only looks at the physical plan during calculation of the
> new watermark value. It determines the watermark node by index, hence we have
> various issues when the watermark node is lost on the optimization.
> 1) watermark advancement is made even there is one node to be dropped (should
> be considered as no data from that node)
> 2) watermark tracker incorrectly update the memory map of the previous value
> of watermark node (index is not a stable key)
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