Hello, my fellow developers and admins
I have a question regarding a master-master replication system.
I implemented one with the help of some of you guys - however I had some
problems regarding the agent so I have a master-master and not a mmm system
- and now I come across the awfull 1062 error - the 'Error 'Duplicate entry
'123020901' for key 'PRIMARY'' on query.'
The issue here is I sometimes insert on master 1 (let's call it like this)
and sometimes on master 2. I thought this wouldn't be an issue as both
database would talk to one another however I think this might be the origin
of the problem.
I already changed the system to always force the inserts query to be on
Master 1 however I would like to know how to avoid this. I read something
about configuring a skip-slave-error but I don't think this would be that
much of a solution as sometimes things happens and it's important to have
some kind of notion or warning.
I read about the auto-increment-increment = 2 or even the increment offset.
If I configure Master 2 to auto-increment-increment = 2 and master 1 to
auto-increment-increment = 1, would this help?
Master 1 - example
Row 1
Row 2
Row 3
Master 2 - example
Row 2
Row 4
Row 6
As far as I'm concerned, eventually sometimes collisions would occur. I
thought that PK's weren't replicated as the database would just receive the
insert query and viola.
How can I avoid this in the future?
I read about UUID as well but as I've inherit this system I have a lot of
sites already relaying on the pk (for query purposes) so I can't just
changed this.
Thanks a lot!
Ricardo
