disttask: merge handle task loop

[D3Hunter]

What problem does this PR solve?

Issue Number: ref #49008

Problem Summary:

What changed and how does it work?

• merge fetchAndHandleRunnableTasksLoop and fetchAndFastCancelTasksLoop into handleTasksLoop
• remove useless taskExecutor.Pause

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 @D3Hunter. 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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[D3Hunter]

remove duplicate cancel

[D3Hunter]

unreachable, prev state check will return directly

[codecov]

Codecov Report

Merging #50224 (cd3cd6d) into master (56c619f) will decrease coverage by 14.7369%.
Report is 3 commits behind head on master.
The diff coverage is 97.8723%.

Additional details and impacted files

@@                Coverage Diff                @@
##             master     #50224         +/-   ##
=================================================
- Coverage   70.1081%   55.3713%   -14.7369%     
=================================================
  Files          1442       1553        +111     
  Lines        419730     586594     +166864     
=================================================
+ Hits         294265     324805      +30540     
- Misses       105216     239122     +133906     
- Partials      20249      22667       +2418     

Flag	Coverage Δ
integration	36.5485% <80.8510%> (?)
unit	70.0210% <97.8723%> (-0.0872%)	⬇️

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

Components	Coverage Δ
dumpling	54.0269% <ø> (ø)
parser	∅ <ø> (∅)
br	55.5063% <ø> (+5.7746%)	⬆️

[D3Hunter]

/retest

[tiprow]

@D3Hunter: 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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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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• pkg/disttask/OWNERS [tangenta,ywqzzy]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-01-09 05:50:42.887423284 +0000 UTC m=+336032.471676969: ☑️ agreed by ywqzzy.
• 2024-01-10 02:07:45.852251109 +0000 UTC m=+409055.436504793: ☑️ agreed by tangenta.