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https://issues.apache.org/jira/browse/BEAM-7423?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ismaël Mejía updated BEAM-7423:
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Status: Open (was: Triage Needed)
> Spark unbounded source advances watermarks prematurely
> ------------------------------------------------------
>
> Key: BEAM-7423
> URL: https://issues.apache.org/jira/browse/BEAM-7423
> Project: Beam
> Issue Type: Bug
> Components: runner-spark
> Reporter: Mike Kaplinskiy
> Priority: Major
>
> {{SparkUnboundedSource}} will advance the watermark to the MAX of the
> watermark of any partition. You can see it at
> [https://github.com/apache/beam/blob/fab12c772d461fc8db4b3c361d38fe2781926fff/runners/spark/src/main/java/org/apache/beam/runners/spark/io/SparkUnboundedSource.java#L204]
> .
> This should be the MIN - this is a combining of watermarks - not advancing.
> This currently means the watermark moves too quickly and the slowest
> partition of an unbounded source has elements that are routinely marked late.
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