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https://issues.apache.org/jira/browse/SPARK-24634?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16520948#comment-16520948
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Jungtaek Lim commented on SPARK-24634:
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Working on this. Will submit a patch soon.
> Add a new metric regarding number of rows later than watermark
> --------------------------------------------------------------
>
> Key: SPARK-24634
> URL: https://issues.apache.org/jira/browse/SPARK-24634
> Project: Spark
> Issue Type: Improvement
> Components: Structured Streaming
> Affects Versions: 2.4.0
> Reporter: Jungtaek Lim
> Priority: Major
>
> Spark filters out late rows which are later than watermark while applying
> operations which leverage window. While Spark exposes information regarding
> watermark to StreamingQueryListener, there's no information regarding rows
> being filtered out due to watermark. The information should help end users to
> adjust watermark while operating their query.
> We could expose metric regarding number of rows later than watermark and
> being filtered out. It would be ideal to support side-output to consume late
> rows, but it doesn't look like easy so addressing this first.
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