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

[joccau]

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]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• 3pointer
• YuJuncen

To complete the pull request process, please ask the reviewers in the list to review by filling /cc @reviewer in the comment.
After your PR has acquired the required number of LGTMs, you can assign this pull request to the committer in the list by filling /assign @committer in the comment to help you merge this pull request.

The full list of commands accepted by this bot can be found here.

Reviewer can indicate their review by submitting an approval review.
Reviewer can cancel approval by submitting a request changes review.

[joccau]

/run-integration-br-test

[joccau]

/run-integration-br-test

[ti-chi-bot]

@tonyxuqqi: Thanks for your review. The bot only counts approvals from reviewers and higher roles in list, but you're still welcome to leave your comments.

In response to this:

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.

[joccau]

/merge

[ti-chi-bot]

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

Commit hash: 399df3c

[YuJuncen]

/merge

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.4: #41847.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.5: #41848.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.6: #41849.