Here is the ruby code that that warning log message is coming from:
begin
client_socket = connect unless client_socket
r,w,e = IO.select([client_socket], [client_socket], [client_socket], nil)
# don't expect any reads, but a readable socket might
# mean the remote end closed, so read it and throw it away.
# we'll get an EOFError if it happens.
client_socket.sysread(16384) if r.any?
# Now send the payload
client_socket.syswrite(payload) if w.any?
rescue => e
@logger.warn("tcp output exception", :host => @host, :port => @port,
:exception => e, :backtrace => e.backtrace)
client_socket.close rescue nil
client_socket = nil
sleep @reconnect_interval
retry
end
This seems to mean that the remote end closed early and we sleep and retry at the default reconnect_interval of 10 seconds.
I suggest that you investigate the network activity, correct the problem and reduce the reconnect_interval to 1 second.