adjust the Priority of General and Accurate Estimator of Karmada Scheduler

[chaosi-zju]

What type of PR is this?

/kind feature

What this PR does / why we need it:

If the accurate estimator is enabled and karmada-scheduler-estimator components also are enabled, the accurate estimator should be prior to ResourceModeling rather than using the minumal value of them.

Which issue(s) this PR fixes:

Fixes #3333

Special notes for your reviewer:

CC @lonelyCZ @whitewindmills

Does this PR introduce a user-facing change?:

introduced priority to schedule estimator so that higher-priority estimator can override the result given by lower-priority.

[codecov-commenter]

Codecov Report

Attention: 48 lines in your changes are missing coverage. Please review.

Comparison is base (697170b) 51.82% compared to head (2a208c7) 51.84%.
Report is 5 commits behind head on master.

Files	Patch %	Lines
pkg/descheduler/core/helper.go	0.00%	34 Missing ⚠️
pkg/scheduler/core/util.go	65.71%	7 Missing and 5 partials ⚠️
pkg/descheduler/descheduler.go	0.00%	2 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4398      +/-   ##
==========================================
+ Coverage   51.82%   51.84%   +0.02%     
==========================================
  Files         244      246       +2     
  Lines       24238    24378     +140     
==========================================
+ Hits        12561    12639      +78     
- Misses      10995    11049      +54     
- Partials      682      690       +8     

Flag	Coverage Δ
unittests	51.84% <34.24%> (+0.02%)	⬆️

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[chaunceyjiang]

Just a question, will this modification require compatibility? Will it force users to upgrade the Estimator component?

[chaosi-zju]

will this modification require compatibility

I don't think it matters. What do you think?

Will it force users to upgrade the Estimator component

I think it's only about the scheduler, and doesn't require upgrading estimator

[jwcesign]

/lgtm

[zhzhuang-zju]

/lgtm

[chaosi-zju]

CC @RainbowMango may be ready to merge, any further comments?

[chaosi-zju]

@whitewindmills sorry for delayed a while, I have updated the code, do you have time checking once more?

[chaosi-zju]

@whitewindmills @RainbowMango @Garrybest

I have improved the logic as:

• priority is not declared by estimator itself, but by the function caller, just like:

// NewGeneralEstimator builds a new GeneralEstimator.
func NewGeneralEstimator(priority EstimatorPriority) *GeneralEstimator {
	return &GeneralEstimator{priority: priority}
}

// GetPriority return the priority of this estimator
func (ge *GeneralEstimator) GetPriority() EstimatorPriority {
	return ge.priority
}

• If higher-priority estimators haven't given the result for certain member clusters, lower-priority estimator only continue to estimate for such clusters haven't got a result. Just like for the cluster which already estimated by its karmada-estimator no need to back off to general estimator.

Sorry for delayed, and thanks for review again~

[whitewindmills]

/lgtm

[karmada-bot]

New changes are detected. LGTM label has been removed.

[karmada-bot]

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