Github user vanzin commented on a diff in the pull request: https://github.com/apache/spark/pull/19893#discussion_r155366150 --- Diff: core/src/test/scala/org/apache/spark/SparkFunSuite.scala --- @@ -52,6 +62,23 @@ abstract class SparkFunSuite getTestResourceFile(file).getCanonicalPath } + private def saveThreadNames(): Unit = { + beforeAllTestThreadNames = Thread.getAllStackTraces.keySet().map(_.getName).toSet + } + + private def printRemainingThreadNames(): Unit = { + val currentThreadNames = Thread.getAllStackTraces.keySet().map(_.getName).toSet + val whitelistedThreadNames = currentThreadNames. + filterNot(s => SparkFunSuite.threadWhiteList.exists(s.matches(_))) --- End diff -- style: `.filterNot { s => `
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