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https://issues.apache.org/jira/browse/SPARK-26362?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16734355#comment-16734355
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Reynold Xin commented on SPARK-26362:
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[~hyukjin.kwon] please make sure we add releasenotes label to tickets like this.
> Remove 'spark.driver.allowMultipleContexts' to disallow multiple Spark
> contexts
> -------------------------------------------------------------------------------
>
> Key: SPARK-26362
> URL: https://issues.apache.org/jira/browse/SPARK-26362
> Project: Spark
> Issue Type: Improvement
> Components: Spark Core
> Affects Versions: 3.0.0
> Reporter: Hyukjin Kwon
> Assignee: Hyukjin Kwon
> Priority: Major
> Labels: releasenotes
> Fix For: 3.0.0
>
>
> Multiple Spark contexts are discouraged and it has been warning from 4 years
> ago (see SPARK-4180).
> It could cause arbitrary and mysterious error cases. (Honestly, I didn't even
> know Spark allows it).
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