Question: Individual ServerInfo and identifying current server via UUID

[kamikazechaser]

I have another question on graceful shutdown that I think is related to this; The server has a Stop() and a Shutdown(), from reading the comments Stop() prevents the server from picking up more tasks and Shutdown() well .. shutsdown. In theory one can call Stop() on a server, then wait until that server has finished processing all it's tasks, then call Shutdown().

Looking at the inspector I can see a Servers() call which returns all servers, and serverinfos include an ID. But I can't see how I can get the ID of the server I called Stop() on ..?

So in practice, I'm unclear how I would check that the server I've just called Stop() on is actually ready for Shutdown(). I mean, sure I could set some kind of max task time and wait that long before shutdown .. but that seems a little weird.

I'd like to request:

• calling NewServer should yield a way to get a server ID
• ideally, we'd have a way to GetServerInfo(serverID string) .. Happy to add myself if you want.

My apologies if there is a way to do this currently and I haven't found it!

Originally posted by @voidshard in https://github.com/hibiken/asynq/issues/710#issuecomment-1762784681

[kamikazechaser]

In theory one can call Stop() on a server, then wait until that server has finished processing all it's tasks, then call Shutdown().

Yeah. But calling shutdown is enough as it will call processor.stop() internally (same as Stop()).

But I can't see how I can get the ID of the server I called Stop() on

Hmm. seems correct, the heartbeater doesn't log this info.

calling NewServer should yield a way to get a server ID

Would a debug log line be enough?

ideally, we'd have a way to GetServerInfo(serverID string)

At the inspector level? It could be possible.

[voidshard]

Yeah. But calling shutdown is enough as it will call processor.stop() internally (same as Stop()). In local testing Stop() doesn't seem to block though (apologies if I'm wrong here, I can check the code when I have time) -- if Stop() does block until it's finished processing everything it has then that's ok.

Would a debug log line be enough? At the inspector level? It could be possible. My idea here was that I could have something in my code that checks that the server has finished processing before allowing it to be killed -- so I'd want a way to get the ID in code that wraps the server.