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https://issues.apache.org/jira/browse/SPARK-22557?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16258690#comment-16258690
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Apache Spark commented on SPARK-22557:
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User 'dongjoon-hyun' has created a pull request for this issue:
https://github.com/apache/spark/pull/19784

> Use ThreadSignaler explicitly
> -----------------------------
>
>                 Key: SPARK-22557
>                 URL: https://issues.apache.org/jira/browse/SPARK-22557
>             Project: Spark
>          Issue Type: Bug
>          Components: Tests
>    Affects Versions: 2.3.0
>            Reporter: Dongjoon Hyun
>            Priority: Minor
>
> ScalaTest 3.0 uses an implicit `Signaler`. This PR makes it sure all Spark 
> tests uses `ThreadSignaler` explicitly which has the same default behavior of 
> interrupting a thread on the JVM in ScalaTest 2.2.x. This will reduce 
> potential flakiness inside the other test suites.



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