[jira] [Created] (YUNIKORN-2206) Make user/queue headroom checks more performant

["Peter Bacsko (Jira)" <ji...@apache.org>]

Peter Bacsko created YUNIKORN-2206:
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             Summary: Make user/queue headroom checks more performant
                 Key: YUNIKORN-2206
                 URL: https://issues.apache.org/jira/browse/YUNIKORN-2206
             Project: Apache YuniKorn
          Issue Type: Improvement
          Components: core - scheduler
            Reporter: Peter Bacsko
            Assignee: Peter Bacsko


Inside Application.tryAllocate() and tryReservedAllocate(), we have code like:

{noformat}
		if !userHeadroom.FitInMaxUndef(ask.GetAllocatedResource()) {
			continue
		}

		// check if this fits in the queue's headroom
		if !headRoom.FitInMaxUndef(ask.GetAllocatedResource()) {
			continue
		}
{noformat}

These calls are relatively expensive, but necessary. Calling them once isn't a problem. 

However, repeated calls are slowing things down considerably.  Yunikorn keeps trying to schedule asks and until there's enough room for the request, these checks will fail. We need a way to speed it up.

See YUNIKORN-2201 about the details.



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