[zeromq-dev] detecting disconnections

[Attila-Mihaly Balazs]

+1 for bi-directional heartbeating. Real-life networks can have all 
kinds of weird situations like silently dropping packets in one 
direction or half-open connections [1] which can only be detected by 
heartbeating. Of course messages received should count as heartbeats for 
efficiency.

Regards,
Attila Balazs

PS. Even more precisely any partial message read should count as a 
heartbeat, otherwise reading large messages can cause a disconnect on an 
otherwise clearly healthy connection.

[1] http://www.evanjones.ca/tcp-stuck-connection-mystery.html
>
> By experience, heartbeating should happen every 2-5 seconds. Ymmv.
>
> On Jan 9, 2012 5:56 PM, "Yi Ding" <yi.s.ding at gmail.com 
> <mailto:yi.s.ding at gmail.com>> wrote:
>
>     On Mon, Jan 9, 2012 at 3:26 PM, Pieter Hintjens <ph at imatix.com
>     <mailto:ph at imatix.com>> wrote:
>     > On Mon, Jan 9, 2012 at 7:19 AM, Yi Ding <yi.s.ding at gmail.com
>     <mailto:yi.s.ding at gmail.com>> wrote:
>     >
>     >> Would it be difficult to implement in the ZeroMQ framework?  I'm
>     >> willing to give it a shot if it doesn't clash with the fundamental
>     >> design.  This is pretty useful, especially in the finance industry,
>     >> where "cancel on disconnect" has become a necessity.
>     >
>     > I'd use heartbeating. Some network errors won't show up as
>     > disconnections and you need heartbeating in any case.
>     >
>     > -Pieter
>
>     I'm going to have heartbeating as well, but it would also be nice to
>     have a disconnect notification.  The reason is that to keep network
>     traffic down, heartbeating has to be done on a relatively long time
>     horizon (I'm thinking 60 seconds apart) and in financial markets, a
>     lot can happen over the period of a second or two.
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>
>
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