start tidb-server with -advertise-address

[nolouch]

Feature Request

Is your feature request related to a problem? Please describe:

For let PD to know the tidb address.
Describe the feature you'd like:

That need tidb-server startup with --advertise-address, like TiKV:

❯ kubectl exec -it hot-new-tikv-1 -n xxx sh
/ # ps
PID   USER     TIME  COMMAND
    1 root     23d18 /tikv-server --pd=hot-new-pd:2379 --advertise-addr=hot-new-tikv-1.hot-new-tikv-peer.csn.svc:20160 --addr=0.0.0.0:20160 --status-addr=0.0
93992 root      0:00 sh

[tennix]

This argument should be added to the startup script of the configmap.

[aylei]

This change will trigger rolling-update of the tidb-servers if the configmap rollout strategy is RollingUpdate. So this deserves a feature name and should be enabled manually on existing clusters.

What's the feature related to this change? @nolouch

[nolouch]

@aylei PD wants to know all TiDB addresses, and do some proxy worker in TiDB, for example, which table the key belongs to? and also, PD show all competent address as a cluster manager is a reasonable operation.

[tennix]

Yes, this makes PD knows all the cluster component info. So we can retrieve the single source of true from PD for cluster status.