ConeyLiu commented on a change in pull request #21913: [SPARK-24005][CORE]
Remove usage of Scala’s parallel collection
URL: https://github.com/apache/spark/pull/21913#discussion_r258039288
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File path: core/src/test/scala/org/apache/spark/util/ThreadUtilsSuite.scala
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@@ -133,4 +133,37 @@ class ThreadUtilsSuite extends SparkFunSuite {
"stack trace contains unexpected references to ThreadUtils"
)
}
+
+ test("parmap should be interruptible") {
+ val t = new Thread() {
+ setDaemon(true)
+
+ override def run() {
+ try {
+ // "par" is uninterruptible. The following will keep running even if
the thread is
+ // interrupted. We should prefer to use "ThreadUtils.parmap".
+ //
+ // (1 to 10).par.flatMap { i =>
+ // Thread.sleep(100000)
+ // 1 to i
+ // }
+ //
+ ThreadUtils.parmap(1 to 10, "test", 2) { i =>
+ Thread.sleep(100000)
+ 1 to i
+ }.flatten
+ } catch {
+ case _: InterruptedException => // excepted
+ }
+ }
+ }
+ t.start()
+ eventually(timeout(10.seconds)) {
+ assert(t.isAlive)
+ }
+ t.interrupt()
+ eventually(timeout(10.seconds)) {
+ assert(!t.isAlive)
+ }
+ }
Review comment:
Hi, @MaxGekk @zsxwing Could you tell me why this can be interrupted? while
`(1 to 10).par` can't.
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