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Re: TCP keepalive support for libpq

From: Magnus Hagander <magnus(at)hagander(dot)net>
To: Tollef Fog Heen <tollef(dot)fog(dot)heen(at)collabora(dot)co(dot)uk>
Cc: pgsql-hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: TCP keepalive support for libpq
Date: 2010-02-09 13:45:01
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Lists: pgsql-hackers
On Tue, Feb 9, 2010 at 14:03, Tollef Fog Heen
<tollef(dot)fog(dot)heen(at)collabora(dot)co(dot)uk> wrote:
> (please Cc me on replies, I am not subscribed)
> Hi,
> libpq currently does not use TCP keepalives.  This is a problem in our
> case where we have some clients waiting for notifies and then the
> connection is dropped on the server side.  The client never gets the FIN
> and thinks the connection is up.  The attached patch unconditionally
> adds keepalives.  I chose unconditionally as this is what the server
> does.  We didn't need the ability to tune the timeouts, but that could
> be added with reasonable ease.

Seems reasonable to add this. Are there any scenarios where this can
cause trouble, that would be fixed by having the ability to select
non-standard behavior?
I don't recall ever changing away from the standard behavior in any of
my deployments, but that might be platform dependent?

If not, I think this is small and trivial enough not to have to push
back for 9.1 ;)

 Magnus Hagander

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