*: fix scheduling can not immediately start after transfer leader (#4875)

[ti-chi-bot]

This is an automated cherry-pick of #4875

Signed-off-by: Ryan Leung [email protected]

What problem does this PR solve?

Issue Number: Close #4769.

What is changed and how does it work?

This PR uses the flag to distinguish if the region's heartbeat is new when transferring the PD leader.

Check List

Tests

• Unit test

Release note

Fix the issue that scheduling cannot immediately start after PD leader transfers

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• lhy1024
• rleungx

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[codecov]

Codecov Report

Merging #4974 (74c651c) into release-5.1 (204ed42) will increase coverage by 0.29%.
The diff coverage is 85.18%.

@@               Coverage Diff               @@
##           release-5.1    #4974      +/-   ##
===============================================
+ Coverage        75.14%   75.43%   +0.29%     
===============================================
  Files              245      245              
  Lines            24784    24797      +13     
===============================================
+ Hits             18623    18705      +82     
+ Misses            4526     4473      -53     
+ Partials          1635     1619      -16     

Flag	Coverage Δ
unittests	75.43% <85.18%> (+0.29%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
server/region_syncer/client.go	79.84% <50.00%> (+0.15%)	⬆️
server/cluster/cluster.go	81.51% <81.25%> (-0.64%)	⬇️
server/cluster/coordinator.go	73.22% <100.00%> (+0.60%)	⬆️
server/core/region.go	91.27% <100.00%> (+0.05%)	⬆️
server/core/region_option.go	84.61% <100.00%> (+0.34%)	⬆️
server/grpc_service.go	48.34% <100.00%> (+0.22%)	⬆️
pkg/tempurl/tempurl.go	45.00% <0.00%> (-15.00%)	⬇️
client/client.go	71.82% <0.00%> (+0.13%)	⬆️
... and 13 more

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[rleungx]

/merge

[ti-chi-bot]

@rleungx: 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.

Commit hash: 72785d2

[ti-chi-bot]

@ti-chi-bot: Your PR was out of date, I have automatically updated it for you.

At the same time I will also trigger all tests for you:

/run-all-tests

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.

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.