grpc.max_connection_age_ms for client config?

[duelin....@gmail.com]

We'd like to avoid holding open a connection for too long from a Ruby client. Based on what documentation we've found[1], we've tried adding `"grpc.max_connection_age_ms" => 30_000` to the `:channel_args` we pass to the stub constructor, hoping to see connections closed after 30 seconds, but it seems to have no effect.

I'm watching for the stub's channel's `connectivity_state` to change from 2 to something else after connecting via either making an RPC call or calling `connectivity_state(true)`. If I wait until the server's configured idle timeout, I see the connectivity_state go to 3, then 0.

Should that channel arg limit the age of client connections? Is there some other way to do that from the client side?

[1]: https://grpc.io/grpc/core/group__grpc__arg__keys.html#gabd3a16f46ad2cb5f06064bb607df7b5b

[John Hume]

Just a follow-up to say I got an answer to this question from Eric Anderson here:

https://stackoverflow.com/questions/46570634/can-a-grpc-client-connect-timeout-be-set-independent-of-reconnect-backoff-settin 

Summary: it's a bug in grpc, and there's work underway to fix it:

https://github.com/grpc/grpc/pull/13121

[Eric Anderson]

grpc.max_connection_age_ms is a server-side option. For documentation, see gRFC A9 Server-side Connection Management. This should work on server-side without issue. If you're concerned about resources, use grpc.max_connection_idle_ms instead. grpc.max_connection_age_ms is mainly useful when using a TCP-based (L4) load balancer.

The client-side option you're looking for... isn't implemented. I've filed https://github.com/grpc/grpc/issues/13212 . That said, depending on the details of what you're doing, it may be better to use the existing server-side options. (It all depends on whom you're trying to help: use client-side option for client optimization, server-side option for server optimization.)

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[John Hume]

Thanks for the information. Apologies for my previous message, which was follow-up on a completely different question. (I thought I'd asked it in this group, but apparently not.)