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https://issues.apache.org/jira/browse/SPARK-4893?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14252763#comment-14252763
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Apache Spark commented on SPARK-4893:
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User 'JoshRosen' has created a pull request for this issue:
https://github.com/apache/spark/pull/3739
> Use test fixture to reset system properties after individual test runs
> ----------------------------------------------------------------------
>
> Key: SPARK-4893
> URL: https://issues.apache.org/jira/browse/SPARK-4893
> Project: Spark
> Issue Type: Improvement
> Components: Spark Core
> Reporter: Josh Rosen
> Assignee: Josh Rosen
>
> Several of our tests call {{System.setProperty}} (or test code which
> implicitly sets system properties) and don't always reset/clear the modified
> properties, which can create ordering dependencies between tests and cause
> [hard-to-diagnose
> failures|https://github.com/apache/spark/pull/3561#issuecomment-67583605].
> I think that we should use a ScalaTest fixture / mixin to automatically
> snapshot and restore system properties after test runs.
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