mridulm commented on code in PR #52373:
URL: https://github.com/apache/spark/pull/52373#discussion_r2611586876
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core/src/test/scala/org/apache/spark/util/UninterruptibleThreadSuite.scala:
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@@ -28,50 +28,69 @@ import org.apache.spark.SparkFunSuite
class UninterruptibleThreadSuite extends SparkFunSuite {
- /** Sleep millis and return true if it's interrupted */
+ /* Sleep millis and return true if it's interrupted */
private def sleep(millis: Long): Boolean = {
try {
Thread.sleep(millis)
false
} catch {
- case _: InterruptedException =>
+ case e: InterruptedException =>
+ log.error("Thread interrupted during sleep", e)
+ true
+ }
+ }
+
+ /* Await latch and return true if it's interrupted */
+ private def await(
+ latch: CountDownLatch,
+ timeout: Long = 10,
+ timeUnit: TimeUnit = TimeUnit.SECONDS): Boolean = {
+ try {
+ if (!latch.await(timeout, timeUnit)) {
+ log.error("timeout while waiting for the latch")
+ fail("timeout while waiting for the latch")
+ }
+ false
+ } catch {
+ case e: InterruptedException =>
+ log.error("Thread interrupted during await", e)
true
}
}
test("interrupt when runUninterruptibly is running") {
val enterRunUninterruptibly = new CountDownLatch(1)
+ val interruptLatch = new CountDownLatch(1)
@volatile var hasInterruptedException = false
@volatile var interruptStatusBeforeExit = false
- val t = new UninterruptibleThread("test") {
+ val t = new UninterruptibleThread("runUninterruptibly") {
override def run(): Unit = {
runUninterruptibly {
enterRunUninterruptibly.countDown()
- hasInterruptedException = sleep(1000)
+ hasInterruptedException = await(interruptLatch)
}
interruptStatusBeforeExit = Thread.interrupted()
}
}
t.start()
- assert(enterRunUninterruptibly.await(10, TimeUnit.SECONDS), "await
timeout")
+ assert(!await(enterRunUninterruptibly), "await interrupted")
t.interrupt()
+ interruptLatch.countDown()
Review Comment:
To clarify with a contrived example:
Test thread (t):
* latch.await(timeout, timeUnit)
* sync.tryAcquireSharedNanos()
* if (Thread.interrupted()) -> not yet interrupted.
-- Context switch --
Main thread:
* t.interrupt()
* interruptLatch.countDown()
-- Context switch --
Test thread (t):
* tryAcquireShared -> return (getState() == 0) ? 1 : -1; -> succeeds.
This results in the intent of why we are interrupt'ing getting ignored.
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