Re: [Quickfix-developers] QuickFIX store and log DB down

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Hi,

My opinion is that logging is not critical, its purpose is tracking and audit.
For me, it is not a really a problem If the engine is not able to log
for a short period of time, but the application can still process the
received message and sending is working. I just would like to  have
the information somewhere saying that I lost some logging during this
period of time because the database is out (that is why I would like
to have an alert mechanism provided by the storage classes).

> 2. What will the QF engine response if the other side send message to QF
> during the period store down?

-> The store is used for retransmission purposes, thus the received
messages are not persisted in the store, only the ones that are sent.

Thanks Oren, I will check the changes in repository.

Regards,
Djalma

On 6/21/07, bennyzlm <ben...@ho...> wrote:
> QuickFIX Documentation: http://www.quickfixengine.org/quickfix/doc/html/index.html
> QuickFIX Support: http://www.quickfixengine.org/services.html
>
>
> Thanks Djalma and Oren for help! I still have some concern:
> If the store is down (not able to connect or schema change, etc), quickfix
> will return false on send.
> 1. Will the message be sent to the other side? or no guarantee?
> 2. What will the QF engine response if the other side send message to QF
> during the period store down?
>
> >From my personal opinion, I don't want quickfix becomes responseless if the
> store/log is down. For the first point, the application behind the engine
> will know if something is wrong in quickfix and can decide what is the next
> step to do. Thus would simply do not send out the message be more feasible
> for the application to "rescue" (no matter stop the engine, give out warn,
> something like "plug and play" to another store/log destination)? For the
> second point, I will further check if the other things in QF works correctly
> if the store/log down.
>
> Regards,
> Benny
>
>
> Oren Miller wrote:
> >
> > QuickFIX Documentation:
> > http://www.quickfixengine.org/quickfix/doc/html/index.html
> > QuickFIX Support: http://www.quickfixengine.org/services.html
> >
> > The repository changes this.  Now quickfix return false on send if
> > the store is unavailable.
> >
> > --oren
> >
> > On Jun 20, 2007, at 1:51 PM, Djalma Rosa dos Santos Filho wrote:
> >
> >> QuickFIX Documentation: http://www.quickfixengine.org/quickfix/doc/
> >> html/index.html
> >> QuickFIX Support: http://www.quickfixengine.org/services.html
> >>
> >> Hi Benny,
> >>
> >> Following is my opinion:
> >>
> >> I don't believe that the logging unavailability should be a reason to
> >> reject a message, although this is a problem that I would like to be
> >> able to detect and correct it at my side asap.
> >>
> >> Anyway, some weeks ago when I was debugging a specific application
> >> error, I also found that the errors in underlying database are simply
> >> hidden from the application, like for example undesired schema
> >> modifications, connection failures etc.
> >>
> >> I thought about an alert mechanism for monitoring, some kind of
> >> callback function or an external file to log errors in logging class
> >> (MySQLLog e.g.). This way, it would become easier to detect errors and
> >> have a recovery mechanism in the application for logging and store.
> >>
> >> Following was the issue I opened with a feature request.
> >> http://www.quickfixengine.org/bugtracker/bug.php?op=show&bugid=255
> >>
> >> I figure out that the problem is worse if the Store is down,
> >> SendToTarget will return false, although the message might have been
> >> sent.  But, with no warranty at all, since retransmission won't be
> >> possible in this situation.
> >>
> >> I belive that currently QF has a very optimistic aproach for the
> >> problems we're concerned about.
> >>
> >> Djalma
> >>
> >> On 6/20/07, bennyzlm <ben...@ho...> wrote:
> >>> QuickFIX Documentation: http://www.quickfixengine.org/quickfix/doc/
> >>> html/index.html
> >>> QuickFIX Support: http://www.quickfixengine.org/services.html
> >>>
> >>>
> >>> Hi,
> >>>
> >>> Currently I am focusing on recovery if some component in the
> >>> system down.
> >>> More specificly, if I use MySQL to be the store and log
> >>> destination for
> >>> quickfix, what will the quickfix engine response to the messaged
> >>> received
> >>> during MySQL is down? I did some experiments and it seems quickfix
> >>> throws
> >>> some SQL exception but do not response any reject message. Is
> >>> there any way
> >>> in quickfix to response the other side that it is down, or reject
> >>> to any
> >>> action taken by the other side? Thanks for any help!
> >>>
> >>> Regards,
> >>> Benny
> >>> --
> >>> View this message in context: http://www.nabble.com/QuickFIX-store-
> >>> and-log-DB-down-tf3950636.html#a11208236
> >>> Sent from the QuickFIX - Dev mailing list archive at Nabble.com.
> >>>
> >>>
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> --
> View this message in context: http://www.nabble.com/QuickFIX-store-and-log-DB-down-tf3950636.html#a11226570
> Sent from the QuickFIX - Dev mailing list archive at Nabble.com.
>
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