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

[bennyzlm <ben...@ho...>]

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
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>>>
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