*: extract conn and replace GetAllocator

[rleungx]

What problem does this PR solve?

Issue Number: Ref #5839.

What is changed and how does it work?

Just as the title says. It should be reviewed after #6553 is merged.

Check List

Tests

• Unit test

Release note

None.

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• CabinfeverB
• nolouch

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[codecov]

Codecov Report

Patch coverage: 88.09% and project coverage change: +0.09 🎉

Comparison is base (6afbcec) 74.57% compared to head (32ce0c0) 74.66%.

❗ Current head 32ce0c0 differs from pull request most recent head 4a28a46. Consider uploading reports for the commit 4a28a46 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6557      +/-   ##
==========================================
+ Coverage   74.57%   74.66%   +0.09%     
==========================================
  Files         417      415       -2     
  Lines       42896    42580     -316     
==========================================
- Hits        31990    31793     -197     
+ Misses       8079     7980      -99     
+ Partials     2827     2807      -20     

Flag	Coverage Δ
unittests	74.66% <88.09%> (+0.09%)	⬆️

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

Impacted Files	Coverage Δ
pkg/core/basic_cluster.go	93.75% <ø> (ø)
pkg/core/region.go	88.97% <ø> (ø)
pkg/schedule/checker/merge_checker.go	70.99% <ø> (ø)
pkg/schedule/filter/healthy.go	100.00% <ø> (ø)
pkg/schedule/operator/create_operator.go	91.77% <ø> (ø)
pkg/schedule/schedulers/evict_slow_store.go	75.90% <ø> (ø)
pkg/schedule/schedulers/evict_slow_trend.go	64.86% <ø> (ø)
pkg/schedule/schedulers/grant_hot_region.go	54.60% <ø> (ø)
pkg/schedule/schedulers/grant_leader.go	68.15% <0.00%> (ø)
pkg/schedule/schedulers/hot_region_config.go	93.85% <ø> (ø)
... and 37 more

... and 44 files with indirect coverage changes

☔ View full report in Codecov by Sentry.
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[CabinfeverB]

LGTM

[CabinfeverB]

Now that we've extracted conn, how about extracting these parameters as well

[rleungx]

sounds great

[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: 06ddb44

[ti-chi-bot]

@rleungx: Your PR was out of date, I have automatically updated it for you.

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.

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