br: backup may fail for some of tidb-operator deployed clusters #53029
Description
Bug Report
Please answer these questions before submitting your issue. Thanks!
1. Minimal reproduce step (Required)
Run a cluster with tidb-operator. And then do some scale-out or something for making CoreDNS responses no such host.
2. What did you expect to see? (Required)
BR should be able to retry this error.
3. What did you see instead (Required)
BR directly fails.
4. What is your TiDB version? (Required)
v6.5.3
Note
Though it seems retrying host name not found errors isn't a good enough idea, in some internal network where DNS name registering is asynchronous and in that case, we may need to wait the service name registration finish. The side-effect is that when we trying to backing up from some host manually and we made a typo, we may need to wait for a long time before BR fails.