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From Asanka Abeysinghe <>
Subject Re: [jira] Updated: (SYNAPSE-381) FIX session with the Acceptor endpoint failes when restarts the Synapse instance
Date Wed, 02 Jul 2008 05:51:47 GMT
The QFJ engine associate with the acceptor handle the recovery scenario 
you mentioned not the Synapse initiator.  This is correct and that is 
the correct way FIX should recover by resetting the seq numbers of both 
endpoints. In the specific case that I saw while the started QFJ engine 
trying to reset the seq number and reconnect, Synapse initiator did 
start another instance of QFJ engine and try to establish a new session.
I will try to recreate the issue and send the exact sequence of events.

Hiranya Jayathilaka (JIRA) wrote:
>      [
> Hiranya Jayathilaka updated SYNAPSE-381:
> ----------------------------------------
>     Attachment: syn-to-exec
> I still don't see any issue. I tried restarting Synapse after clearing the message store.
Then the next message Synapse sends to the acceptor will contain the seq number 1 (ie the
sequence has reset). But the acceptor expects a message with a higher seq number. The FIX
spec clearly mentions how to handle this kind of situations:
> "If the incoming message has a sequence number less than expected and the PossDup
> flag is not set it indicates a serious error and it is strongly recommended that the
session be
> terminated and manual intervention be initiated."
> This is exactly what the acceptor does by immediately disconnecting the session. But
Synapse initiator will keep on trying to connect to the session by increasing the seq number
at each attempt. If you wait enough you will see that Synapse will finally manage to connect
to the session.
> See the attached log file from the acceptor for more details. See the inline comments

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