Re: [Quickfix-developers] MsgSeqNum too low

[Djalma R. d. S. F. <drs...@gm...>]

Hi Brian,

Have you tried to intercept the logout message in toAdmin to check the text
field?

if ( !possDupFlag )
  {
    std::stringstream stream;
    stream << "MsgSeqNum too low, expecting " << getExpectedTargetNum()
           << " but received " << msgSeqNum;
    *generateLogout( stream.str() );*
    throw std::logic_error( stream.str() );
  }

Djalma

On Tue, Mar 18, 2008 at 12:23 PM, Brian Erst <azz...@ya...>
wrote:

> QuickFIX Documentation:
> http://www.quickfixengine.org/quickfix/doc/html/index.html
> QuickFIX Support: http://www.quickfixengine.org/services.html
>
>
> I have a counterparty that uses a non-standard way to indicate failover
> from one FIX backend to another (using FIX 4.2).
>
> If the first FIX node fails, you are disconnected (either socket dropped
> or a quick logout). When you reconnect and are directed to the failover
> node, the only indication that you've failed over is that the sequence
> number is "1". Of course, QuickFIX rightly rejects that as "MsgSeqNum too
> low" and starts a mad race to reconnect with until it gets a valid sequence
> number in the login response.
>
> I need to short circuit that behavior. If I'm reconnecting to a failover
> node, I need to detect that I got a "too low" sequence number and then
> disconnect, reset my own sequence numbers and login with a 141=Y. That
> brings both systems back into sync.
>
> My quick perusal of the QF 1.12.4 source doesn't look promising. It
> appears that it reads a FIX message from the socket, calls two versions of
> "next", which call nextLogon, which eventually calls verify(login...) which
> will throw an exception captured within the send loop, logging it out and
> writing the error to the error log.  At no point do I see a  place where my
> application will be informed either of the message or its failure.
>
> Anyone  know what I'm missing? Or do I have to turn all validation off
> (which would REALLY suck)? Or do I have to create a custom FileLogger that
> will look for the "MsgSeqNum too low" text (double-plus-ungood)?
>
> - Brian Erst
>
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