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https://issues.apache.org/jira/browse/BEAM-12849?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17416141#comment-17416141
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Etienne Chauchot commented on BEAM-12849:
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it seems to be a gradle conf issue: grade *provided* scope does not put spark
libs in the runtime classpath. I saw that by running nexmark (it is a main)
that uses local (in mem) spark cluster
> Structured Streaming runner: Migrate metrics sources
> ----------------------------------------------------
>
> Key: BEAM-12849
> URL: https://issues.apache.org/jira/browse/BEAM-12849
> Project: Beam
> Issue Type: Sub-task
> Components: runner-spark
> Reporter: Etienne Chauchot
> Priority: P2
> Labels: structured-streaming
>
> java.lang.ClassNotFoundException: org.apache.spark.metrics.source.Source no
> more exists in spark 3.
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