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https://issues.apache.org/jira/browse/SPARK-18721?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15723691#comment-15723691
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Apache Spark commented on SPARK-18721:
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User 'zsxwing' has created a pull request for this issue:
https://github.com/apache/spark/pull/16160
> ForeachSink breaks Watermark in append mode
> -------------------------------------------
>
> Key: SPARK-18721
> URL: https://issues.apache.org/jira/browse/SPARK-18721
> Project: Spark
> Issue Type: Bug
> Components: Structured Streaming
> Affects Versions: 2.1.0
> Reporter: Cristian Opris
> Assignee: Shixiong Zhu
> Priority: Critical
>
> The watermark is not updated in append mode with a ForeachSink
> Because ForeachSink creates a separate IncrementalExecution instance, the
> physical plan will be recreated for the logical plan, which results in a new
> EventTimeWatermarkExec operator being created, that's unreachable from
> StreamExecution. This results in the watermark never being updated, and
> append mode never emits results.
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