[GitHub] [yunikorn-core] lixmgl commented on a diff in pull request #429: [YUNIKORN-790] Implement MaxApplications enforcement

[GitBox <gi...@apache.org>]

lixmgl commented on code in PR #429:
URL: https://github.com/apache/yunikorn-core/pull/429#discussion_r989537935


##########
pkg/scheduler/objects/queue.go:
##########
@@ -1292,3 +1304,67 @@ func (sq *Queue) String() string {
 	return fmt.Sprintf("{QueuePath: %s, State: %s, StateTime: %x, MaxResource: %s}",
 		sq.QueuePath, sq.stateMachine.Current(), sq.stateTime, sq.maxResource)
 }
+
+func (sq *Queue) incRunningApps() {
+	if sq == nil {
+		return
+	}
+	if sq.parent != nil {
+		sq.parent.incRunningApps()
+	}
+	sq.internalIncRunningApps()
+}
+
+func (sq *Queue) internalIncRunningApps() {
+	sq.Lock()
+	defer sq.Unlock()
+	sq.runningApps++
+}

Review Comment:
   @pbacsko what i did is first find the parent recursively [method](https://github.com/apache/yunikorn-core/pull/429/files#diff-27632d48eb925e150a33bc92370ceaa66c31048018d11ca7a53a0b50ab7250acR1310 ) 
   Then lock this parent sq only and incRunningApps. It's not single threaded. 
   This way we can avoid locking all the parents during the recursion. 
   I recall @wilfred-s pointed out this issue here https://github.com/apache/yunikorn-core/pull/384/files#r843616529 for combining into one method. 
   



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