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https://issues.apache.org/jira/browse/SPARK-24730?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Apache Spark reassigned SPARK-24730:
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Assignee: Apache Spark (was: Tathagata Das)
> Add policy to choose max as global watermark when streaming query has
> multiple watermarks
> -----------------------------------------------------------------------------------------
>
> Key: SPARK-24730
> URL: https://issues.apache.org/jira/browse/SPARK-24730
> Project: Spark
> Issue Type: New Feature
> Components: Structured Streaming
> Affects Versions: 2.3.1
> Reporter: Tathagata Das
> Assignee: Apache Spark
> Priority: Major
>
> Currently, when a streaming query has multiple watermark, the policy is to
> choose the min of them as the global watermark. This is safe to do as the
> global watermark moves with the slowest stream, and is therefore is safe as
> it does not unexpectedly drop some data as late, etc. While this is indeed
> the safe thing to do, in some cases, you may want the watermark to advance
> with the fastest stream, that is, take the max of multiple watermarks. This
> JIRA is to add that configuration.
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