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- Subject: Re: luasocket: how to use 'keepalive' ?
- From: Valerio Schiavoni <valerio.schiavoni@...>
- Date: Mon, 17 Jan 2011 19:08:32 +0100
On Mon, Jan 17, 2011 at 6:51 PM, Drake Wilson <email@example.com> wrote:
>> - as soon as the server crashes and the connection is somehow broken,
>> the client must do something
> You can't do that. There is no way to detect that on the wire if you
> really want "as soon as"
That is the reason why I wanted to use keep-alive messages, as they
sounded a out-of-the-box solution which I could rely upon.
> TCP-level keepalives are not readily configurable at the application
> level in many common operating systems. There is no standard socket
> option that I know of to set the timing from that side; I've only ever
> seen it done at the OS configuration level.
ok then. I will search for the default values used by the tcp stack on
Linux and OSX, out of curiosity.
> I wouldn't use them if there's another choice. If you're designing
> the application protocol, provide a mechanism for application-level
> keepalives instead.
I am implementing a protocol  that rely on TCP to detect failures
of nodes, where 'an open tcp connection' is setup to a small set of
nodes. What I wanted is to detect when these connections are broken,
without any other heartbeat strategy. I guess I will roll-back to
that approach nevertheless.
1 - http://docs.di.fc.ul.pt/jspui/bitstream/10455/2981/1/07-13.pdf
Thanks for the suggestions.