slfan1989 commented on code in PR #6569:
URL: https://github.com/apache/hadoop/pull/6569#discussion_r1499283399
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hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/event/Event.java:
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@@ -32,4 +32,14 @@ public interface Event<TYPE extends Enum<TYPE>> {
TYPE getType();
long getTimestamp();
String toString();
+
+ /**
+ * In case of parallel execution of events in the same dispatcher,
+ * the result of this method will be used as semaphore.
+ * If method returns null, then a default semaphore will be used.
+ * @return the semaphore
+ */
+ default String getLockKey() {
+ return null;
Review Comment:
Is returning null expected here?
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