br: multi download and parse metafile

[Leavrth]

What problem does this PR solve?

Issue Number: close #50772

Problem Summary:
br restore is very slow when there are many metafiles

What changed and how does it work?

multi download and parse metafile

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)

1 hours -> 20 minutes

• 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

[tiprow]

Hi @Leavrth. Thanks for your PR.

PRs from untrusted users cannot be marked as trusted with /ok-to-test in this repo meaning untrusted PR authors can never trigger tests themselves. Collaborators can still trigger tests on the PR using /test all.

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[codecov]

Codecov Report

Merging #50829 (e5f9ddd) into master (789cd3e) will increase coverage by 4.4438%.
Report is 246 commits behind head on master.
The diff coverage is 66.1538%.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #50829        +/-   ##
================================================
+ Coverage   72.2373%   76.6812%   +4.4438%     
================================================
  Files          1465       1481        +16     
  Lines        360787     475154    +114367     
================================================
+ Hits         260623     364354    +103731     
- Misses        80896      90755      +9859     
- Partials      19268      20045       +777     

Flag	Coverage Δ
integration	51.2580% <61.5384%> (?)
unit	73.6020% <65.3846%> (+1.4832%)	⬆️

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

Components	Coverage Δ
dumpling	54.1396% <ø> (-2.3375%)	⬇️
parser	∅ <ø> (∅)
br	58.3008% <66.1538%> (+12.0585%)	⬆️

[3pointer]

LGTM

[3pointer]

do we need a copy of cipher?

[Leavrth]

it is a readonly data.

[Leavrth]

/retest

[tiprow]

@Leavrth: 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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[Leavrth]

/test pull-br-integration-test

[tiprow]

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

In response to this:

/test pull-br-integration-test

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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: 3pointer, YuJuncen

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Needs approval from an approver in each of these files:

• br/OWNERS [3pointer,YuJuncen]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-03-04 09:44:44.641285077 +0000 UTC m=+73911.663531467: ☑️ agreed by 3pointer.
• 2024-03-06 03:17:11.286526245 +0000 UTC m=+223458.308772628: ☑️ agreed by YuJuncen.