vanzin commented on a change in pull request #23344: [SPARK-26392][YARN] Cancel
pending allocate requests by taking locality preference into a…
URL: https://github.com/apache/spark/pull/23344#discussion_r242700484
##########
File path:
resource-managers/yarn/src/main/scala/org/apache/spark/deploy/yarn/YarnAllocator.scala
##########
@@ -374,14 +374,18 @@ private[yarn] class YarnAllocator(
val numToCancel = math.min(numPendingAllocate, -missing)
logInfo(s"Canceling requests for $numToCancel executor container(s) to
have a new desired " +
s"total $targetNumExecutors executors.")
-
- val matchingRequests = amClient.getMatchingRequests(RM_REQUEST_PRIORITY,
ANY_HOST, resource)
- if (!matchingRequests.isEmpty) {
- matchingRequests.iterator().next().asScala
- .take(numToCancel).foreach(amClient.removeContainerRequest)
- } else {
- logWarning("Expected to find pending requests, but found none.")
+ // cancel pending allocate requests by taking locality preference into
account
+ val cancelRequests = {
Review comment:
This could be a single statement, since `take` handles negative values.
```
scala> Seq(1, 2, 3).take(-1)
res0: Seq[Int] = List()
```
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