log-backup: fix the issue that gc-worker owner cannot check log-backup task existed. (#41824)

[ti-chi-bot]

This is an automated cherry-pick of #41824

What problem does this PR solve?

Issue Number: close #41806
close #41642

Problem Summary:
If the gc-worker owner and the pitr owner is not the same node, the gc-worker owner cannot check the log-backup task existed.

What is changed and how it works?

Check List

Tests

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

Manual test

• Create a TiDB cluster with the 3 tidb-server, 3 pd-server and 3 tikv-server.
• Create a log-backup task, Search the log in all of tidb-server, the log like this

2023-03-01 16:38:04 (UTC+08:00)TiDB 10.2.5.20:4100[db.go:206] ["inc log backup task"] [count=1]
2023-03-01 16:38:07 (UTC+08:00)TiDB 10.2.5.31:4100[db.go:206] ["inc log backup task"] [count=1]
2023-03-01 16:38:10 (UTC+08:00)TiDB 10.2.5.32:4100[db.go:206] ["inc log backup task"] [count=1]

• restart all of tidb-server, and search the log

2023-03-01 17:11:27 (UTC+08:00)TiDB 10.2.5.31:4100[db.go:206] ["inc log backup task"] [count=1]
2023-03-01 17:11:27 (UTC+08:00)TiDB 10.2.5.32:4100[db.go:206] ["inc log backup task"] [count=1]
2023-03-01 17:11:27 (UTC+08:00)TiDB 10.2.5.20:4100[db.go:206] ["inc log backup task"] [count=1]

• stop a log-backup task. Search the log

2023-03-01 17:13:02 (UTC+08:00)TiDB 10.2.5.32:4100[db.go:212] ["dec log backup task"] [count=0]
2023-03-01 17:13:02 (UTC+08:00)TiDB 10.2.5.20:4100[db.go:212] ["dec log backup task"] [count=0]
2023-03-01 17:13:02 (UTC+08:00)TiDB 10.2.5.31:4100[db.go:212] ["dec log backup task"] [count=0]

• start the log-backup task again, and search the log

2023-03-01 17:13:50 (UTC+08:00)TiDB 10.2.5.32:4100[db.go:206] ["inc log backup task"] [count=1]
2023-03-01 17:13:50 (UTC+08:00)TiDB 10.2.5.31:4100[db.go:206] ["inc log backup task"] [count=1]
2023-03-01 17:13:50 (UTC+08:00)TiDB 10.2.5.20:4100[db.go:206] ["inc log backup task"] [count=1]

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.

fix the issue that gc owner cannot check log-backup task existed

[ti-chi-bot]

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[ti-chi-bot]

@ti-chi-bot: This cherry pick PR is for a release branch and has not yet been approved by release team.
Adding the do-not-merge/cherry-pick-not-approved label.

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[ti-chi-bot]

@ti-chi-bot: 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
idc-jenkins-ci-tidb/check_dev_2	38b614d	link	true	/test check-dev2
idc-jenkins-ci-tidb/check_dev	38b614d	link	true	/test check-dev
idc-jenkins-ci-tidb/build	38b614d	link	true	/test build
idc-jenkins-ci-tidb/unit-test	38b614d	link	true	/test unit-test
idc-jenkins-ci-tidb/mysql-test	38b614d	link	true	/test mysql-test

Full PR test history. Your PR dashboard.

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