core: batch get region size (#7252)

[ti-chi-bot]

This is an automated cherry-pick of #7252

What problem does this PR solve?

Issue Number: Close #7248.

What is changed and how does it work?

Check List

Tests

• Unit test

Release note

None.

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• disksing
• lhy1024

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[lhy1024]

lgtm, but need to fix conflict

[nolouch]

/merge

[ti-chi-bot]

@nolouch: It seems you want to merge this PR, I will help you trigger all the tests:

/run-all-tests

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[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Details

Commit hash: 87881b8

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (e0ab17c) 75.68% compared to head (b183e19) 75.55%.

Files	Patch %	Lines
server/cluster/cluster.go	50.00%	1 Missing ⚠️

Additional details and impacted files

@@               Coverage Diff               @@
##           release-6.5    #7329      +/-   ##
===============================================
- Coverage        75.68%   75.55%   -0.13%     
===============================================
  Files              332      332              
  Lines            33685    33695      +10     
===============================================
- Hits             25493    25457      -36     
- Misses            6007     6050      +43     
- Partials          2185     2188       +3     

Flag	Coverage Δ
unittests	75.55% <94.44%> (-0.13%)	⬇️

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[nolouch]

/merge

[ti-chi-bot]

@nolouch: It seems you want to merge this PR, I will help you trigger all the tests:

/run-all-tests

You only need to trigger /merge once, and if the CI test fails, you just re-trigger the test that failed and the bot will merge the PR for you after the CI passes.

If you have any questions about the PR merge process, please refer to pr process.

Details

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the ti-community-infra/tichi repository.

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Details

Commit hash: b183e19