Why is it necessary to execute the add command first and then start the node when adding a new node to etcd

[smallemployees]

Bug report criteria

• This bug report is not security related, security issues should be disclosed privately via etcd maintainers.
• This is not a support request or question, support requests or questions should be raised in the etcd discussion forums.
• You have read the etcd bug reporting guidelines.
• Existing open issues along with etcd frequently asked questions have been checked and this is not a duplicate.

What happened?

After starting the node and executing the add command, the node cannot join the cluster

What did you expect to happen?

I want to understand the mechanism of this area, because if the operation is reversed, it cannot proceed normally

How can we reproduce it (as minimally and precisely as possible)?

I want to understand the mechanism of this area, because if the operation is reversed, it cannot proceed normally

Anything else we need to know?

No response

Etcd version (please run commands below)

$ etcd --version
# paste output here
3.5.4
$ etcdctl version
# paste output here

Etcd configuration (command line flags or environment variables)

paste your configuration here

Etcd debug information (please run commands below, feel free to obfuscate the IP address or FQDN in the output)

$ etcdctl member list -w table
# paste output here

$ etcdctl --endpoints=<member list> endpoint status -w table
# paste output here

Relevant log output

No response