Re: [Quickfixj-users] Behaviour of finite vs infinite resend requests in QFJ

[Christoph J. <chr...@ma...>]

Hi,

actually I have never seen this behaviour where the connection is dropped because the queued 
messages are processed (and then are too low a sequence number).
I quickly checked our log files but could not find an occurrence where more than one app message is 
resent.
I'd like to write a unit test to reproduce this behaviour but currently am a little too busy. :-/

Cheers,
Chris.

On 10.11.20 12:09, Philip Whitehouse wrote:
> QuickFIX/J Documentation: http://www.quickfixj.org/documentation/
> QuickFIX/J Support: http://www.quickfixj.org/support/
>
>
>
> Hi all,
>
> In the FIX spec (FIX Session Layer Technical Specification) in "4.8.2 Request retransmission of 
> messages" we see several scenarios.
>
> QFJ seems to operate based on a hybrid of the two which has a problem in certain scenarios.
>
> We enqueue messages received (per the second approach). But we also send an infinite resend request.
>
> Thus in the scenario provided if we receive 3,4,5 we will enqueue them. Then we will re-request 2 
> -> 0.
> A compliant broker then sends, 2,3,4,5 per the first approach.
> When we get 2, we process it then de-queue 3,4,5 and process them. Then when we process 3,4,5 from 
> the broker we complain (in the form of a disconnect).
>
> Has anyone else seen this behaviour.
>
> My view is:
>
>  1. If we send an infinite resend request we should discard queued messages
>  2. If we send a finite resend request we should keep enqueuing messages
>
> I'm unclear how "ClosedResendInterval" should affect this - or is "ClosedResendInterval" 
> essentially "follow the spec" (contrary to the docs).
>
> Best regards,
>
> Philip Whitehouse
>
>
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-- 
Christoph John
Software Engineering
T +49 241 557080-28
chr...@ma...

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