felixcheung commented on a change in pull request #24017: [SPARK-27094][YARN]
Work around RackResolver swallowing thread interrupt.
URL: https://github.com/apache/spark/pull/24017#discussion_r266188431
##########
File path:
resource-managers/yarn/src/main/scala/org/apache/spark/deploy/yarn/YarnAllocator.scala
##########
@@ -417,12 +424,40 @@ private[yarn] class YarnAllocator(
containersToUse, remainingAfterHostMatches)
}
- // Match remaining by rack
+ // Match remaining by rack. Because YARN's RackResolver swallows thread
interrupts
+ // (see SPARK-27094), which can cause this code to miss interrupts from
the AM, use
+ // a separate thread to perform the operation.
val remainingAfterRackMatches = new ArrayBuffer[Container]
- for (allocatedContainer <- remainingAfterHostMatches) {
- val rack = resolver.resolve(conf, allocatedContainer.getNodeId.getHost)
- matchContainerToRequest(allocatedContainer, rack, containersToUse,
- remainingAfterRackMatches)
+ if (remainingAfterHostMatches.nonEmpty) {
+ var exception: Option[Throwable] = None
+ val thread = new Thread("spark-rack-resolver") {
+ override def run(): Unit = {
+ try {
+ for (allocatedContainer <- remainingAfterHostMatches) {
+ val rack = resolver.resolve(conf,
allocatedContainer.getNodeId.getHost)
+ matchContainerToRequest(allocatedContainer, rack,
containersToUse,
+ remainingAfterRackMatches)
+ }
+ } catch {
+ case NonFatal(e) =>
+ exception = Some(e)
Review comment:
should it capture all exception/error when it is fatal (if possible)
I can see how the error can be "lost" on this new thread instead of getting
propagate to re-throw from the original (the one calling thread.join())
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