Re: [Quickfix-developers] reconnecting after diconnect

[Oren M. <or...@qu...>]

Well, in a typical recovery scenario this should never happen.  If=20
someone is sending you sequence numbers that are too low, it is=20
considered a serious error that the FIX spec says requires manual=20
intervention.  If an internet connection goes down, or a computer=20
crashes, this should not happen because QuickFIX (and any FIX engine)=20
can recover its state from the MessageStore and continue sending where=20=

it left off.  The only time this would not happen is if the state is=20
somehow destroyed or corrupted.  Now if this does happen, you will have=20=

to synchronize the sequence numbers.  If you have control of both=20
sides, the easiest way to do this is to reset both sides to 1, which=20
can be done by just deleting the state.  Otherwise you need to=20
coordinate with the counter-party and either one of you needs to adjust=20=

your sequence numbers, or you can both reset to 1.

If you did want to try to handle this programatically, you can set the=20=

sequence numbers on the Session to whatever you want through the class=20=

API, however this is a risky thing to do because you would risk one or=20=

both of you losing messages without being aware of it.

--oren

On Jun 4, 2004, at 3:55 PM, Clark Sims wrote:

> The next question is how do I fix this situation?
> =A0
> In production I could easily see a situation where an internet=20
> connection goes down, or a computer crashes, or I have to kill the=20
> client, and when I bring it back up again, there is a problem with the=20=

> sequence numbers. So I really need to be able to fix this problem.
>
> Clark Sims <cla...@ya...> wrote:
> yes you are correct:
> =A0
> 20040604-20:32:02 : Connection succeeded
> 20040604-20:32:03 : Initiated logon request
> 20040604-20:32:05 : MsgSeqNum too low RECEIVED: 11 EXPECTED: 165=20
> PosDup: N
> 20040604-20:32:05 : Sequence number too low and PossDupFlag
>
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