9uapaw commented on a change in pull request #3342:
URL: https://github.com/apache/hadoop/pull/3342#discussion_r698335050
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File path:
hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/scheduler/capacity/QueuePath.java
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@@ -116,8 +121,79 @@ public boolean hasParent() {
return parent != null;
}
+ /**
+ * Creates a new {@code QueuePath} from the current full path as parent, and
+ * the appended child queue path as leaf.
+ * @param childQueue path of leaf queue
+ * @return new queue path made of current full path and appended leaf path
+ */
+ public QueuePath append(String childQueue) {
+ return new QueuePath(getFullPath(), childQueue);
+ }
+
+ /**
+ * Returns an iterator of queue path parts, starting from the highest level
+ * (generally root).
+ * @return queue part iterator
+ */
+ @Override
+ public Iterator<String> iterator() {
+ return
Arrays.asList(getFullPath().split(QUEUE_REGEX_DELIMITER)).iterator();
Review comment:
I agree that returning a pointer based on a temporary object/local
variable is discouraged in non-GC languages, but it is completely safe to do so
in Java (there are only some very intricate, JVM distribution specific methods
that allow one to create a dangling pointer) as long as you are not returning a
null explicitly.
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