vanzin commented on a change in pull request #24616: [SPARK-27726] [Core] Fix 
performance of ElementTrackingStore deletes when using InMemoryStore under high 
loads
URL: https://github.com/apache/spark/pull/24616#discussion_r284494865
 
 

 ##########
 File path: 
core/src/main/scala/org/apache/spark/status/ElementTrackingStore.scala
 ##########
 @@ -46,7 +50,26 @@ import org.apache.spark.util.kvstore._
  */
 private[spark] class ElementTrackingStore(store: KVStore, conf: SparkConf) 
extends KVStore {
 
-  private val triggers = new HashMap[Class[_], Seq[Trigger[_]]]()
+  private class LatchedTriggers(val triggers: Seq[Trigger[_]]) {
+    val countDeferred = new AtomicInteger(0)
+
+    def fireOnce(f: Seq[Trigger[_]] => Unit): Boolean = {
+      val shouldExecute = countDeferred.compareAndSet(0, 1)
+      if (shouldExecute) {
+        doAsync {
+          countDeferred.set(0)
+          f(triggers)
+        }
+      }
+      shouldExecute
 
 Review comment:
   You could avoid the `WriteQueueResult` object with an inlined `if...else` 
here.

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