+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" <[email protected]
<mailto:[email protected]>> wrote:
On Mon, Jan 9, 2012 at 3:26 PM, Pieter Hintjens <[email protected]
<mailto:[email protected]>> wrote:
> On Mon, Jan 9, 2012 at 7:19 AM, Yi Ding <[email protected]
<mailto:[email protected]>> 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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