At 12:00 PM 10/9/2007, Olivier Smedts wrote: >I agree to the idee that replication should not happen in policyd, but >in MySQL, cause MySQL already supports replication and redundancy. And >it works nearly like a charm. But here is the problem : >policyd doesn't use an AUTO_INCREMENT id in its primary keys (in >"triplet" table mostly), so if two mail servers receive the same mail in >the same time (between the time at which policyd checks in the entry >already exists and the time at which it inserts a new one), the first >server will insert the new entry, and the second server won't be able to >insert it (primary key constraint violation) so the replication will stop. > > > > > I personnaly like this since I have already replicated system like > > that with severals slaves... and a loadbalancer have lb read slaves. > >I set up 3 mail servers (MX) with policyd and MySQL multi-master chain >replication (each node is slave of the previous one and master of the >next one). >I think a solution would be to insert "IF EXIST" in DELETE and UPDATE >queries, and "IF NOT EXIST" in INSERT queries of policyd (greylist.c >source file), so that the same query could be executed two times without >stopping replication. What do you think of this solution ? Could it be >done upstream, to make policyd a perfect greylisting daemon for mail >server clusters ?
We have a similar setup and it is pretty rare that this type of duplicate key item would occur. A easy fix within mysql is to just tell mysql to ignore duplicate key errors on replication. It'll create an extremely slight data inconsistency; however, it will not affect anything from my experience. Just add the following to my.cnf [mysqld] section. slave-skip-errors=126,1062 We use this reliably with policyd as well as dozens of other mysql apps with zero impact on data integrity. - Nate ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ _______________________________________________ policyd-users mailing list policyd-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/policyd-users
