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Posted to github@beam.apache.org by GitBox <gi...@apache.org> on 2022/06/03 23:54:29 UTC

[GitHub] [beam] kennknowles opened a new issue, #19411: Spark unbounded source advances watermarks prematurely

kennknowles opened a new issue, #19411:
URL: https://github.com/apache/beam/issues/19411

   `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](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.
   
   Imported from Jira [BEAM-7423](https://issues.apache.org/jira/browse/BEAM-7423). Original Jira may contain additional context.
   Reported by: mikekap.


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