Github user jerryshao commented on a diff in the pull request:
https://github.com/apache/spark/pull/20781#discussion_r173709533
--- Diff:
resource-managers/yarn/src/main/scala/org/apache/spark/deploy/yarn/YarnAllocator.scala
---
@@ -81,7 +81,7 @@ private[yarn] class YarnAllocator(
private val releasedContainers = Collections.newSetFromMap[ContainerId](
new ConcurrentHashMap[ContainerId, java.lang.Boolean])
- private val numExecutorsRunning = new AtomicInteger(0)
+ private val runningExecutors = new
java.util.concurrent.ConcurrentHashMap[String, Unit]()
--- End diff --
This can be changed to `Collections.newSetFromMap`, since we only need
`Set` instead of `Map`.
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