core: change scoreV2 to adapt the higher disk capacity and amp .

[bufferflies]

Signed-off-by: bufferflies [email protected]

What problem does this PR solve?

Issue Number: Close #4805

What is changed and how it works?

if the biggest store's capacity is more than 2T , the store's score may be closed to the up score as b(1e7). so the smallest store will not be balanced even if they has less available capacity.

Check List

Tests

• Unit test

Code changes

Side effects

Related changes

Release note

None.

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• disksing
• rleungx

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[codecov]

Codecov Report

Merging #4837 (1a036db) into master (1885540) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #4837   +/-   ##
=======================================
  Coverage   75.34%   75.34%           
=======================================
  Files         295      295           
  Lines       28810    28810           
=======================================
+ Hits        21706    21708    +2     
+ Misses       5186     5181    -5     
- Partials     1918     1921    +3     

Flag	Coverage Δ
unittests	75.34% <100.00%> (+<0.01%)	⬆️

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

Impacted Files	Coverage Δ
server/core/test_util.go	83.20% <ø> (ø)
server/core/store.go	81.68% <100.00%> (ø)
server/storage/kv/etcd_kv.go	69.56% <0.00%> (-10.15%)	⬇️
pkg/dashboard/adapter/manager.go	78.72% <0.00%> (-4.26%)	⬇️
server/tso/tso.go	61.14% <0.00%> (-4.00%)	⬇️
server/schedule/operator_controller.go	85.65% <0.00%> (-0.81%)	⬇️
server/config/persist_options.go	92.91% <0.00%> (-0.75%)	⬇️
server/server.go	75.00% <0.00%> (-0.47%)	⬇️
server/grpc_service.go	54.22% <0.00%> (-0.36%)	⬇️
server/schedulers/hot_region.go	83.08% <0.00%> (-0.31%)	⬇️
... and 12 more

---

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[rleungx]

LGTM, and we need some regression tests to ensure it works better.

[disksing]

/merge

[ti-chi-bot]

@disksing: 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: 1a036db

[ti-chi-bot]

In response to a cherrypick label: new pull request created: #4838.

[ti-chi-bot]

In response to a cherrypick label: new pull request created: #4847.

[ti-chi-bot]

In response to a cherrypick label: new pull request created: #4848.

[ti-chi-bot]

In response to a cherrypick label: new pull request created: #4849.

[ti-chi-bot]

In response to a cherrypick label: new pull request created: #5769.