2. In the current implementation, virtual channels and physical channels have a one-to-one relationship, and the total number of physical channels increases as the number of virtual channels increases; later, the total number of physical channels needs to be fixed, and multiple virtual channels share one physical channel.
3. The name of the virtual channel is globally unique, and the `collection meta` records the correspondence between the virtual channel and the physical channel.
### Add processing of time synchronization signals from proxy node
### Add processing of time synchronization signals from Proxy node
1. A virtual channel can be inserted by multiple proxies, so the timestamp in the virtual channel does not increase monotonically.
2. All proxies report the timestamp of all the virtual channels to the `RC` periodically.
3. The `RC` collects the timestamps from the proxies on each virtual channel and gets the minimum one as the timestamp of that virtual channel, and then inserts the timestamp into the virtual channel.
4.The proxy reports the timestamp to the `RC` via grpc.
5.The proxy needs to register itself in etcd when it starts, `RC` will listen to the corresponding key to determine how many active proxies there are, and thus determine if all of them have sent timestamps to `RC`.
4.Proxy reports the timestamp to the `RC` via grpc.
5.Proxy needs to register itself in etcd when it starts, `RC` will listen to the corresponding key to determine how many active proxies there are, and thus determine if all of them have sent timestamps to `RC`.
6. If a proxy is not registered in etcd but sends a timestamp or any other grpc request to `RC`, `RC` will ignore the grpc request.
