Strange Data Appearing in the information_schema.cluster_info Table

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This topic has been translated from a Chinese forum by GPT and might contain errors.

Original topic: information_schema.cluster_info表出现诡异数据

| username: army

[TiDB Usage Environment] Production Environment
[TiDB Version] v6.1.1
[Reproduction Path] Operations performed that led to the issue
No reproduction method available
[Encountered Issue: Issue Phenomenon and Impact]
There is a row in the information_schema.cluster_info table where the IP of the tidb instance cannot be found, but tiup display shows that there is no tidb-server with the 4000 port. I would like to ask what could be the issue.
Result of tiup display

image
image980×218 9.92 KB

information_schema.cluster_info

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image1183×245 14 KB

[Resource Configuration]
[Attachments: Screenshots/Logs/Monitoring]

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| username: 我是咖啡哥 | Original post link

I just checked the documentation and found a bug in it. The documentation is missing an introduction to the server_id column.
I think we can look it up based on this column information, but what does this column represent? I thought it was the process ID, but it isn’t in my environment.

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| username: 我是咖啡哥 | Original post link

The component started at 19:26 on December 7th, which was yesterday. Can you recall what you were doing at that time yesterday?

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| username: tidb菜鸟一只 | Original post link

You must have performed some operations at that time, right? Could the data have been generated by mistake?

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| username: army | Original post link

I found out that it was caused by the BR backup. It is currently in the BR checksum phase, but the official documentation does not mention that such an instance would be started.

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| username: system | Original post link

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