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https://issues.apache.org/jira/browse/BEAM-7423?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17137262#comment-17137262
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Beam JIRA Bot commented on BEAM-7423:
-------------------------------------
This issue was marked "stale-P2" and has not received a public comment in 14
days. It is now automatically moved to P3. If you are still affected by it, you
can comment and move it back to P2.
> 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: P3
>
> {{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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