pbacsko commented on code in PR #597:
URL: https://github.com/apache/yunikorn-core/pull/597#discussion_r1276421343


##########
pkg/scheduler/objects/application.go:
##########
@@ -103,6 +104,7 @@ type Application struct {
        stateLog             []*StateLogEntry            // state log for this 
application
        placeholderData      map[string]*PlaceholderData // track placeholder 
and gang related info
        askMaxPriority       int32                       // highest priority 
value of outstanding asks
+       hasPlaceholderAlloc  atomic.Bool                 // Whether there is at 
least one allocated placeholder (has to be atomic.Bool due to queue/app lock 
ordering)

Review Comment:
   Update: I used the new unit test to check performance, we really want to 
avoid `GetCopyOfApps()`. That slows things down significantly. I believe we 
still have a speedup because we avoid the actual sorting, but the speedup is 
much smaller this way.



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