*: save TS into metadata for external engine, and prepare to use it as startTS

[lance6716]

What problem does this PR solve?

Issue Number: close #46986 ref #51312

Problem Summary:

What changed and how does it work?

for external engine, save the startTS in disttask metadata, so after failover it will not change

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

[tiprow]

Hi @lance6716. Thanks for your PR.

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[codecov]

Codecov Report

Merging #51283 (5302b8e) into master (a6768bc) will decrease coverage by 15.5867%.
Report is 3 commits behind head on master.
The diff coverage is 65.5737%.

Additional details and impacted files

@@                Coverage Diff                @@
##             master     #51283         +/-   ##
=================================================
- Coverage   70.5513%   54.9646%   -15.5867%     
=================================================
  Files          1459       1571        +112     
  Lines        434196     604028     +169832     
=================================================
+ Hits         306331     332002      +25671     
- Misses       108552     248852     +140300     
- Partials      19313      23174       +3861     

Flag	Coverage Δ
integration	37.7872% <65.5737%> (?)
unit	70.3132% <13.1147%> (-0.0067%)	⬇️

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

Components	Coverage Δ
dumpling	53.9957% <ø> (ø)
parser	∅ <ø> (∅)
br	56.5798% <54.1666%> (+10.7652%)	⬆️

[lance6716]

I will merge kvproto PR after this PR is approved

[lance6716]

/ok-to-test

[D3Hunter]

/test pull-lightning-integration-test

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@D3Hunter: The specified target(s) for /test were not found.
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[D3Hunter]

rest lgtm

[ti-chi-bot]

@lance6716: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
idc-jenkins-ci-tidb/build	5302b8e	link	true	/test build

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[lance6716]

lightning CI passed https://do.pingcap.net/jenkins/blue/organizations/jenkins/pingcap%2Ftidb%2Fpull_lightning_integration_test/detail/pull_lightning_integration_test/67/pipeline

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: D3Hunter, tangenta

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Needs approval from an approver in each of these files:

• OWNERS [D3Hunter,tangenta]
• br/pkg/lightning/OWNERS [D3Hunter]
• pkg/ddl/OWNERS [tangenta]
• pkg/disttask/OWNERS [D3Hunter,tangenta]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-02-26 06:29:32.030499664 +0000 UTC m=+857060.778122774: ☑️ agreed by D3Hunter.
• 2024-02-26 07:13:48.002676014 +0000 UTC m=+859716.750299141: ☑️ agreed by tangenta.

[lance6716]

change target branch because kvproto PR will not be merged soon