Fix hardlink may cause dead loop, also disable config gc_hardlink_rate (#4452)

[ti-chi-bot]

This is an automated cherry-pick of #4452

What problem does this PR solve?

Issue Number: close #4426

Problem Summary:

What is changed and how it works?

picked from #4425

Check List

Tests

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

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

None

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• flowbehappy
• jiaqizho

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[JaySon-Huang]

/run-all-tests

[JaySon-Huang]

/merge

[ti-chi-bot]

@JaySon-Huang: It seems you want to merge this PR, I will help you trigger all the tests:

/run-all-tests

You only need to trigger /merge once, and 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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[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: ad2e38d

[VelocityLight]

/merge

[ti-chi-bot]

@VelocityLight: It seems you want to merge this PR, I will help you trigger all the tests:

/run-all-tests

You only need to trigger /merge once, and 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.

If you have any questions about the PR merge process, please refer to pr process.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the ti-community-infra/tichi repository.

[sre-bot]

Coverage for changed files

Filename                                Regions    Missed Regions     Cover   Functions  Missed Functions  Executed       Lines      Missed Lines     Cover    Branches   Missed Branches     Cover
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Interpreters/Settings.h                       1                 0   100.00%           1                 0   100.00%           1                 0   100.00%           0                 0         -
Storages/DeltaMerge/StoragePool.cpp          41                 2    95.12%           7                 0   100.00%          88                 4    95.45%          20                 4    80.00%
Storages/Page/V2/PageFile.cpp               502               145    71.12%          55                 3    94.55%         997               229    77.03%         348               120    65.52%
Storages/Page/V2/PageFile.h                  70                15    78.57%          31                 2    93.55%          92                27    70.65%          40                19    52.50%
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
TOTAL                                       614               162    73.62%          94                 5    94.68%        1178               260    77.93%         408               143    64.95%

Coverage summary

Functions  MissedFunctions  Executed  Lines   MissedLines  Cover
16980      9544             43.79%    191342  96874        49.37%

full coverage report (for internal network access only)