[jira] [Created] (YUNIKORN-1715) Yunikorn performance improvements

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

Peter Bacsko created YUNIKORN-1715:
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             Summary: Yunikorn performance improvements
                 Key: YUNIKORN-1715
                 URL: https://issues.apache.org/jira/browse/YUNIKORN-1715
             Project: Apache YuniKorn
          Issue Type: Improvement
          Components: core - scheduler
            Reporter: Peter Bacsko


There are some methods/functions in Yunikorn which are called frequently and often unnecessarily. On a large, busy cluster, eliminating these calls can result in faster scheduling cycle, therefore better throughput.

In the listed cases below, we can re-use a previously computed value and the expensive copy/sort phase can be eliminated completely.

*Retrieving node iterators*: in {{baseNodeCollection.getNodeIteratorInternal()}}, we always clone the tree of sorted nodes, then we build a slice. The node tree is only modified when a node gets a new score.

*Queue sorting*: only need sorting in the following events:
* Allocated resource changed in one of the child queues (most common)
* Pending resource changed from 0 to "n", or from "n" to 0 (affects filtering)
* Child queue got stopped (affects filtering)
* Child queue structure changed on config update

*Application sorting*: in {{Queue.TryAllocate()}} and {{Queue.TryPlaceholderAllocate()}}, {{sortApplications()}} always runs. In every iteration, it calls {{Queue.GetCopyOfApps()}}. It only has to run if something relevant happens from the sorting POV:
* Application added/removed
* Ask added to an application
* Ask max priority changed in at least one application
* Allocated resource changed in at least one application

*Request sorting*: request (ask) sorting is only necessary when the following occurs:
* Ask added
* pendingAskRepeat gets 0 in an ask



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