Github user tdas commented on a diff in the pull request: https://github.com/apache/spark/pull/14292#discussion_r71924307 --- Diff: sql/core/src/test/scala/org/apache/spark/sql/test/SQLTestUtils.scala --- @@ -247,6 +248,46 @@ private[sql] trait SQLTestUtils } } } + + /** Run a test on a separate [[UninterruptibleThread]]. */ + protected def testWithUninterruptibleThread(name: String, quietly: Boolean = false) + (body: => Unit): Unit = { + val timeoutMillis = 10000 + var ex: Throwable = null + + def runOnThread(): Unit = { + val thread = new UninterruptibleThread(s"Testing thread for test $name") { + override def run(): Unit = { + try { + body + } catch { + case NonFatal(e) => + ex = e + } + } + } + thread.setDaemon(true) + thread.start() + thread.join(timeoutMillis) + if (thread.isAlive) { + thread.interrupt() + // If this interrupt does not work, then this thread is most likely running something that + // is not interruptible. There is not much point to wait for the thread to termniate, and + // we rather let the JVM terminate the thread on exit. + fail( + s"Test '$name' running on o.a.s.util.UninterruptibleThread timed out after" + + s" $timeoutMillis ms") + } else if (ex != null) { + throw ex + } + } + + if (quietly) { --- End diff -- Its more scala-ish, but slightly non-intuitive to read. Maybe rename f to testingFunc
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