[Pending] Fix singleflight race

[kevindiu]

Signed-off-by: kevindiu [email protected]

Description:

This PR fixes singleflight race error.

Related Issue:

How Has This Been Tested?:

Environment:

• Go Version: 1.17.2
• Docker Version: 20.10.8
• Kubernetes Version: 1.22.0
• NGT Version: 1.13.7

Types of changes:

• [x] Bug fix [type/bug]
• [ ] New feature [type/feature]
• [ ] Add tests [type/test]
• [ ] Security related changes [type/security]
• [ ] Add documents [type/documentation]
• [ ] Refactoring [type/refactoring]
• [ ] Update dependencies [type/dependency]
• [ ] Update benchmarks and performances [type/bench]
• [ ] Update CI [type/ci]

Changes to Core Features:

• [x] Have you added an explanation of what your changes do and why you'd like us to include them?
• [x] Have you written new tests for your core changes, as applicable?
• [x] Have you successfully ran tests with your changes locally?

Checklist:

• [x] I have read the CONTRIBUTING document.
• [x] I have checked open Pull Requests for the similar feature or fixes?
• [x] I have added tests and benchmarks to cover my changes.
• [x] I have ensured all new and existing tests passed.
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] I have updated the documentation accordingly.

[vdaas-ci]

[CHATOPS:HELP] ChatOps commands.

• :ok_woman: /approve - approve
• :love_letter: /changelog - replace the PR body by changelog details
• :bento: /format - format codes and add licenses
• :white_check_mark: /gen-test - generate test codes
• :label: /label - add labels
• :rewind: /rebase - rebase master
• :end: :two: :end: /label actions/e2e-deploy - run E2E deploy & integration test

[codecov[bot]]

Codecov Report

Merging #1499 (19c908f) into master (c4768a7) will increase coverage by 0.05%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1499      +/-   ##
==========================================
+ Coverage   30.51%   30.56%   +0.05%     
==========================================
  Files         372      373       +1     
  Lines       32212    32238      +26     
==========================================
+ Hits         9828     9853      +25     
+ Misses      22020    22019       -1     
- Partials      364      366       +2     

Impacted Files	Coverage Δ
internal/singleflight/singleflight.go	100.00% <100.00%> (ø)
...nt/core/ngt/service/vqueue/uninserted_index_map.go	64.48% <0.00%> (-8.75%)	:arrow_down:
internal/worker/worker.go	84.37% <0.00%> (+0.78%)	:arrow_up:
pkg/agent/core/ngt/service/ngt.go	20.44% <0.00%> (+1.11%)	:arrow_up:
pkg/agent/core/ngt/service/option.go	91.41% <0.00%> (+1.84%)	:arrow_up:

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