Do not warn if setsockopt fails due to ECONNRESET #2494
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In case a client disconnects early, setting socket options
(nodelay/keepalive) fails and causes warnings. These warnings
have little value, given that modifying options on an already
broken connection is basically a noop.
This can happen in case of bad connectivity/congestion, but
also by design like in haproxy, which "uses RST to close the
health check as it free’s[sic!] resources on haproxy and the
backend server immediately".
Due to the above we encounter quite some log spam:
WARN tonic::transport::server::incoming:error trying to
set TCP_NODELAY: Connection reset by peer (os error 54)
WARN tonic::transport::server::incoming:error trying to
set TCP_KEEPALIVE: Connection reset by peer (os error 54)
(This is on FreeBSD, hence "os error 54" (ECONNRESET)).
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Motivation
In case a client disconnects early, setting socket options (nodelay/keepalive) fails and causes warnings. These warnings have little value, given that modifying options on an already broken connection is basically a noop.
This can happen in case of bad connectivity/congestion, but also by design like in haproxy, which "uses RST to close the health check as it free’s[sic!] resources on haproxy and the backend server immediately".
Due to the above we encounter quite some log spam:
(This is on FreeBSD, hence "os error 54" (ECONNRESET)).
Solution
Do not warn in case setting socket options fails due to the connection being reset by the client.