ddl: limit the count of getting ddlhistory jobs (#55590)

[ti-chi-bot]

This is an automated cherry-pick of #55590

What problem does this PR solve?

Issue Number: close #55711

Problem Summary:
If user want to get all of DDL-history jobs, the tidb-server has the risk of OOM because of large mount of DDL-history jobs.

What changed and how does it work?

1. Limit the count of jobs when getting the ddl history jobs.
2. The parameter 'limit' should be large than 1 and less than or equal to 1024.
3. If use default 'limit', user can get the 1024 ddl history jobs by default.

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.

Manual test steps

1. create 5k table in database with the 'sysbench' tool.
2. query the mount of ddl-history jobs, it contains 6052 ddl history jobs.

mysql> select count(*) from mysql.tidb_ddl_history;
+----------+
| count(*) |
+----------+
|     6052 |
+----------+
1 row in set (0.00 sec)

4. run below command

curl -X POST http://172.16.6.95:11080/ddl/history

and the it gets the 1024 ddl history jobs by default.

5. run below command, it gets the fault messages when limit < 0 or limit >= 1025

# curl -X POST http://172.16.6.95:11080/ddl/history -d "limit=0"
ddl history limit must be greater than 0 and less than or equal to 1024

# curl -X POST http://172.16.6.95:11080/ddl/history -d "limit=1025"
ddl history limit must be greater than 0 and less than or equal to 1024

curl -X POST http://172.16.6.95:11080/ddl/history -d "limit=1024" > output2.log

4. run below command, it gets 1024 ddl history jobs with the parameter 'limit'.

curl -X POST http://172.16.6.95:11080/ddl/history -d "limit=1024" > output2.log
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 5357k    0 5357k  100    10  22.0M     42 --:--:-- --:--:-- --:--:-- 22.0M

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.

Limit the count of jobs when getting the ddl history jobs.

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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: joccau, tangenta, xiabee

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2025-02-11 09:45:54.468341898 +0000 UTC m=+349796.864563962: ☑️ agreed by joccau.
• 2025-02-11 10:14:05.113497086 +0000 UTC m=+351487.509719147: ☑️ agreed by tangenta.

[joccau]

/test unit-test

[tiprow]

@joccau: No presubmit jobs available for pingcap/[email protected]

In response to this:

/test unit-test

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[codecov]

Codecov Report

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Additional details and impacted files

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