Reduce unnecessary watch events and bindingSpec change in the binding controller

[XiShanYongYe-Chang]

What type of PR is this?

/kind cleanup

What this PR does / why we need it:

ref #6780

Which issue(s) this PR fixes:

Part of #6780

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

[karmada-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[gemini-code-assist]

Summary of Changes

Hello @XiShanYongYe-Chang, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request aims to enhance the efficiency of the binding controllers by significantly reducing the number of unnecessary watch events that trigger reconciliation. By introducing a custom predicate, the controllers will now only process updates to ResourceBinding and ClusterResourceBinding objects when specific, relevant fields within their Spec have been modified, thereby optimizing performance and decreasing system load.

Highlights

• Optimized Event Handling: Implemented a new predicate function to filter ResourceBinding and ClusterResourceBinding update events, ensuring reconciliations only occur when significant Spec fields change.
• Reduced Controller Load: Introduced careBindingSpecChanged function to precisely identify relevant changes in ResourceBindingSpec, preventing unnecessary controller re-syncs for irrelevant field updates.
• Enhanced Test Coverage: Added comprehensive unit tests for the careBindingSpecChanged function, covering various scenarios of field modifications to ensure its correctness.

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[gemini-code-assist]

Code Review

This pull request introduces predicate functions to the binding controllers to filter out unnecessary update events, which is a great optimization to reduce controller load. The new careBindingSpecChanged function correctly identifies most of the relevant fields in ResourceBindingSpec. I've found a critical issue in the cluster_resource_binding_controller and a minor bug in the comparison logic, along with a suggestion for improving maintainability. Overall, this is a valuable improvement.

[XiShanYongYe-Chang]

Given that @rohan-019 has already submitted the PR, I plan to close the current PR at last.

[codecov-commenter]

⚠️ Please install the to ensure uploads and comments are reliably processed by Codecov.

Codecov Report

❌ Patch coverage is 35.59322% with 38 lines in your changes missing coverage. Please review.
✅ Project coverage is 45.74%. Comparing base (70411ab) to head (2ca74fa).
⚠️ Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
pkg/controllers/binding/binding_controller.go	0.00%	19 Missing ⚠️
...ers/binding/cluster_resource_binding_controller.go	0.00%	19 Missing ⚠️
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Additional details and impacted files

@@           Coverage Diff           @@
##           master    #6786   +/-   ##
=======================================
  Coverage   45.74%   45.74%           
=======================================
  Files         689      689           
  Lines       57161    57231   +70     
=======================================
+ Hits        26149    26183   +34     
- Misses      29383    29421   +38     
+ Partials     1629     1627    -2     

Flag	Coverage Δ
unittests	45.74% <35.59%> (+<0.01%)	⬆️

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[XiShanYongYe-Chang]

Hi @rohan-019, You can refer to this PR.

[RainbowMango]

Please add some descriptions to this PR.

[XiShanYongYe-Chang]

Please add some descriptions to this PR.

@rohan-019 submitted PR #6784 to address the same subtask, and the PR is almost ready after several rounds of iterations. Let me close the current PR.
/close

[karmada-bot]

@XiShanYongYe-Chang: Closed this PR.

In response to this:

Please add some descriptions to this PR.

@rohan-019 submitted PR #6784 to address the same subtask, and the PR is almost ready after several rounds of iterations. Let me close the current PR.
/close

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