maria-discuss team mailing list archive

[Alexandre Almeida <alexandre@xxxxxxxxxx>]

Brian,

	Allow me to share how we are handling this issue. We have a customer  
that develop and sell a system that control employees in & out. They  
have many customers with multiple plants & sites.

	To avoid the related issue, we did a simple workaround, we add a new  
column at each table. The column name ;-) server_id :-)

	Now each insert is running like this: INSERT INTO foo SET server_id =  
@server_id, auto_increment_column = NULL, bla bla bla

	BinLog format chosen = ROW.

	The worse and complex scenario is a customer with 17 sites. All of  
them linked by ADSL Internet ;-) Yes, believe me.

	The problem of INSERT / DELETE / SELEC was successfuly solved. The  
only issue to take care is the possibility of race condition on UPDATE  
ops.

	
Alexandre

Em 27/01/2010, às 18:51, Brian Evans escreveu:

> I was reading over the replication discussion on maria-developers
> I thought I'd share some thoughts that are not so technical as I do  
> not
> understand the back end that well.
>
> Our system is currently a master-master WAN replication setup, each
> writing to a different DB with an offline process to do copies.
> Our databases extensively uses auto-increments on tables (more than
> necessary, but that's another story).
>
> Would future developments allow synchronous replication to occur on a
> single database when the WAN link has a single point of failure(SPoF)?
> How might an auto-increment system handle such a failure?
>
> This SPoF is our network link that can be a transient problem out of  
> our
> control.
> Both sides may need to keep inserting data during this transient  
> issue.
> This is usually not an issue 99% of the time, but it's better to  
> prepare
> for downtime than trying to fix data errors in that 1%.
>
>
>
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