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From:Ricardo Date:October 27 2011 12:09am
Subject:Re: Master-Master -> duplicate entry
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In order to have a small redudant system, this is the way to go.

I've made a mistake and allowed colisions to happen

The increment-increment and offset increment will problably solve this 


On 27 Oct 2011, at 00:38, Rick James <rjames@stripped> wrote:

> This is a big reason not to allow writing to both Masters.
> 
> On 10/26/11 12:20 PM, Ricardo Freitas wrote:
>> 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
>> 
>> 
>> 
>> 
>> 
> 
> -- 
> Rick James - MySQL Geek
> 
> 
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Thread
Master-Master -> duplicate entryRicardo Freitas26 Oct
  • Re: Master-Master -> duplicate entrynavid@navid.it26 Oct
    • Re: Master-Master -> duplicate entryRicardo26 Oct
  • Re: Master-Master -> duplicate entryRick James27 Oct
    • Re: Master-Master -> duplicate entryRicardo27 Oct
      • Re: Master-Master -> duplicate entryMarcus Bointon27 Oct
        • Re: Master-Master -> duplicate entryJohan De Meersman27 Oct
          • Re: Master-Master -> duplicate entryRicardo27 Oct
          • Re: Master-Master -> duplicate entryRicardo27 Oct
          • Re: Master-Master -> duplicate entryMarcus Bointon27 Oct
            • RE: Master-Master -> duplicate entryRicardo Freitas27 Oct
              • Re: Master-Master -> duplicate entrynavid@navid.it27 Oct
              • Re: Master-Master -> duplicate entryMarcus Bointon27 Oct
                • RE: Master-Master -> duplicate entryRicardo Freitas27 Oct
                  • Re: Master-Master -> duplicate entryMarcus Bointon27 Oct
                    • RE: Master-Master -> duplicate entryRicardo Freitas27 Oct
                    • Re: Master-Master -> duplicate entryRicardo27 Oct
                      • Re: Master-Master -> duplicate entryMarcus Bointon27 Oct
                        • RE: Master-Master -> duplicate entryRicardo Freitas27 Oct
                          • Re: Master-Master -> duplicate entryMarcus Bointon27 Oct
                            • Re: Master-Master -> duplicate entry (UUID lecture)Rick James27 Oct
            • Re: Master-Master -> duplicate entryJohan De Meersman28 Oct
        • Re: Master-Master -> duplicate entryRicardo27 Oct
  • Re: Master-Master -> duplicate entrylist27 Oct
    • RE: Master-Master -> duplicate entryRicardo Freitas27 Oct
      • Re: Master-Master -> duplicate entryMarcus Bointon27 Oct
        • Re: Master-Master -> duplicate entryMySQL)27 Oct
    • Re: Master-Master -> duplicate entryRick James27 Oct
      • Re: Master-Master -> duplicate entryMarcus Bointon27 Oct
        • Re: Master-Master -> duplicate entryRick James27 Oct
          • Re: Master-Master -> duplicate entryJohan De Meersman28 Oct
            • Re: Master-Master -> duplicate entryRick James28 Oct
              • Re: Master-Master -> duplicate entryMats Kindahl31 Oct
      • Re: Master-Master -> duplicate entrylist27 Oct