Re: Add GoAway protocol message for graceful but fast server shutdown/switchover

Reading the proposal, I have some questions. Sorry if they have been
already discussed.

1. If clients do not disconnect a session even if they have received
   the GoAway message, PostgreSQL server will give up the shutdown
   sequence. In this case, shouldn't the PostgreSQL server send a
   message indicating "I have given up the smart shutdown request"?
   Otherwise, the fact that GoAway has been received will remain in
   the client, and if the client does not check the receiving timely,
   the client may exit the session unnecessarily.

2. Can we use a NOTICE message instead of the new protocol GoAway for
   the purpose?  Frontends are expected to receive and handle NOTICE
   messages while processing frontend/backend protocol. So I think it
   is fair to expect clients to find the NOTICE message and behave as
   we discussed. This way, we don't need the GoAway message.

Regards,
--
Tatsuo Ishii
SRA OSS K.K.
English: http://www.sraoss.co.jp/index_en/
Japanese:http://www.sraoss.co.jp