Bug #108706 improve GR error message

• Submitted: 7 Oct 2022 11:07
• Modified: 7 Oct 2022 12:06
• Reporter: Simon Mudd (OCA)
• Status: Verified
• Category: MySQL Server: Group Replication
• Severity: S4 (Feature request)
• Version: 8.0.30
• OS: Any
• CPU Architecture: Any
• Tags: group_replication

[7 Oct 2022 11:07] Simon Mudd

Description:
I see this in logging:

2022-10-06T05:01:10.576060Z 0 [ERROR] [MY-011735] [Repl] Plugin group_replication reported: '[GCS] Error retrieving server information.'
2022-10-06T05:01:42.577875Z 0 [ERROR] [MY-011735] [Repl] Plugin group_replication reported: '[GCS] Error retrieving server information.'
2022-10-06T05:02:14.593657Z 0 [ERROR] [MY-011735] [Repl] Plugin group_replication reported: '[GCS] Error retrieving server information.'
2022-10-06T05:02:24.594231Z 0 [ERROR] [MY-011735] [Repl] Plugin group_replication reported: '[GCS] Error retrieving server information.'
2022-10-06T05:03:04.614942Z 0 [ERROR] [MY-011735] [Repl] Plugin group_replication reported: '[GCS] Error retrieving server information.'

The error is not very helpful as it does not provide any useful information to me.

How to repeat:
Setup GR and you might see the log entries above.

Suggested fix:
Improve logging to show:
- which server was being talked to. I guess one of the other cluster members.
- if possible which action was being attempted, unless "retrieving server information" is the action.  If that's the case what information.
- potentially if you can provide further details of WHY you can't retrieve the information and report any error that was obtained while trying to do that.

I would expect to see a line like:

2022-10-06T05:03:04.614942Z 0 [ERROR] [MY-011735] [Repl] Plugin group_replication reported: '[GCS] Error retrieving server information.' from <hostname_or_ip>:<port>: <error or other message to provide further details>