cluster: speed scheduler exit (#4148)

[ti-chi-bot]

This is an automated cherry-pick of #4148

What problem does this PR solve?

closed #4146 speed schedule exit

What is changed and how it works?

pause scheduler after accept stop signal, and do not loop

Check List

Tests

• Manual test (add detailed scripts or steps below)

Code changes

Side effects

Related changes

• Need to cherry-pick to the release branch

Release note

speed scheduler exit  

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• disksing
• nolouch

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[disksing]

need resolve conflict

[codecov]

Codecov Report

Merging #4200 (0a5d96f) into release-4.0 (ae08ed0) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@               Coverage Diff               @@
##           release-4.0    #4200      +/-   ##
===============================================
- Coverage        74.98%   74.97%   -0.01%     
===============================================
  Files              211      211              
  Lines            20061    20065       +4     
===============================================
+ Hits             15042    15043       +1     
- Misses            3693     3697       +4     
+ Partials          1326     1325       -1     

Flag	Coverage Δ
unittests	74.97% <100.00%> (-0.01%)	⬇️

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

Impacted Files	Coverage Δ
server/cluster/cluster.go	77.77% <100.00%> (+0.88%)	⬆️
server/cluster/coordinator.go	68.43% <100.00%> (+0.33%)	⬆️
server/schedulers/shuffle_hot_region.go	57.14% <0.00%> (-12.50%)	⬇️
server/kv/etcd_kv.go	78.26% <0.00%> (-7.25%)	⬇️
server/heartbeat_streams.go	65.93% <0.00%> (-6.60%)	⬇️
pkg/etcdutil/etcdutil.go	72.05% <0.00%> (-5.89%)	⬇️
server/tso/tso.go	78.98% <0.00%> (-3.63%)	⬇️
pkg/mock/mockhbstream/mockhbstream.go	87.03% <0.00%> (-1.86%)	⬇️
server/grpc_service.go	59.87% <0.00%> (+0.40%)	⬆️
server/server.go	75.24% <0.00%> (+0.80%)	⬆️
... and 7 more

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[VelocityLight]

/merge

[ti-chi-bot]

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

/run-all-tests

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.

Commit hash: 96101b5

[nolouch]

ref #4146

[VelocityLight]

/merge

[ti-chi-bot]

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

/run-all-tests

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.

Commit hash: cd2d333