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https://issues.apache.org/jira/browse/SPARK-33361?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17227078#comment-17227078
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Jungtaek Lim commented on SPARK-33361:
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cc. [~hvanhovell]
> Dataset.observe() functionality does not work with structured streaming
> -----------------------------------------------------------------------
>
> Key: SPARK-33361
> URL: https://issues.apache.org/jira/browse/SPARK-33361
> Project: Spark
> Issue Type: Bug
> Components: Structured Streaming
> Affects Versions: 3.0.0
> Environment: Spark on k8s, version 3.0.0
> Reporter: John Wesley
> Priority: Major
>
> The dataset observe() functionality does not work as expected with spark in
> cluster mode.
> Related discussion here:
> [http://apache-spark-user-list.1001560.n3.nabble.com/Best-way-to-emit-custom-metrics-to-Prometheus-in-spark-structured-streaming-td38826.html]
> Using lit() as the aggregation column goes through well. However sum, count
> etc returns 0 all the time.
>
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