restore: auto tune concurrency configuration when using new mode restoration

[3pointer]

What problem does this PR solve?

Issue Number: ref #50701
Problem Summary:
make concurrency easy to use for user.

What changed and how does it work?

based on tikv config import.num-threads to determine the concurrency.

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No need to test

  • I checked and no code files have been changed.

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

Please refer to Release Notes Language Style Guide to write a quality release note.

None

[ti-chi-bot]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[tiprow]

Hi @3pointer. Thanks for your PR.

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[codecov]

Codecov Report

Merging #50877 (c04e0ad) into master (c852515) will decrease coverage by 12.3570%.
Report is 222 commits behind head on master.
The diff coverage is 66.6666%.

Additional details and impacted files

@@                Coverage Diff                @@
##             master     #50877         +/-   ##
=================================================
- Coverage   70.3605%   58.0036%   -12.3570%     
=================================================
  Files          1456       1581        +125     
  Lines        420835     619732     +198897     
=================================================
+ Hits         296102     359467      +63365     
- Misses       104393     236833     +132440     
- Partials      20340      23432       +3092     

Flag	Coverage Δ
integration	36.6206% <59.2592%> (?)
unit	70.3151% <50.0000%> (-0.0293%)	⬇️

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

Components	Coverage Δ
dumpling	54.0514% <ø> (+0.0245%)	⬆️
parser	∅ <ø> (∅)
br	57.6275% <66.6666%> (+7.0574%)	⬆️

[3pointer]

/retest

[tiprow]

@3pointer: Cannot trigger testing until a trusted user reviews the PR and leaves an /ok-to-test message.

In response to this:

/retest

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[YuJuncen]

It seems this function is only called in conn package and doesn't rely on any item in config. Why not make it a private function in conn?

[3pointer]

I'd like to put all parse config logic into one pkg for future usage.

[YuJuncen]

Why rename it to kvconfig? It seems belongs to BR. Perhaps use pconfig as restore.go did.

[3pointer]

I think all logic belong to TiKV could use this name

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Leavrth, YuJuncen

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-02-06 02:56:45.5668568 +0000 UTC m=+239131.133626683: ☑️ agreed by Leavrth.
• 2024-02-29 03:23:32.026990738 +0000 UTC m=+1105100.774613850: ☑️ agreed by YuJuncen.

[tiprow]

@3pointer: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
fast_test_tiprow	c04e0ad	link	true	/test fast_test_tiprow
tidb_parser_test	c04e0ad	link	true	/test tidb_parser_test

Full PR test history. Your PR dashboard.

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