Hi! ----- Original Message ----- From: ""Madscientist"" <[EMAIL PROTECTED]> Newsgroups: mailing.database.mysql Sent: Tuesday, April 23, 2002 10:44 PM Subject: Circular replication
> Hi, > > We're doing something weird (what else is new). We're hoping to use > MySQL as the base of a distributed database with peer replication. Most > of the peering and control mechanisms will be in the core application > code, but we're counting on MySQL's ability to replicate for some of the > lower-level peer synchronization mechanisms. It appears from the docs > that most of this will be straightforward, however it is not clear (or I > missed it) if replication works with all table types. > > This is important because the issue of complex transactions has recently > come up and we may need to use innodb tables. > > It is not entirely clear wether replication will work with innodb > tables. > We're hoping to use MySQL 4.x MySQL replication works with InnoDB tables. Currently MySQL replication does not support transactions completely, because commit marks are not written to the binlog and the slave runs in the auto-commit mode. Thus a reader on the slave may see half a transaction in his query. This restriction may be removed soon because a potential license customer wants the commit marks to the binlog. > Can we build reliable, circular replication with innodb tables in MySQL? > > We will have the application pick a single master node for any > particular table and/or database until all nodes are synchronized... > Then the app will vote for a new master if needed. > > For example. > > NODE1 NODE2 NODE3 > MASTER OF A MASTER OF B MASTER OF C > > ...--->[ ABC ]-------->[ ABC ]--------->[ ABC ]----... > > Will this work with innodb. > If not directly, then how? If circular replication requires that several nodes are updated at the same time, then you will bump into the inherent consistency/performance problems of distributed databases. These problems are not specific to MySQL or InnoDB, but to distributed transactions in general. > Thanks in advacnce, > _M Best regards, Heikki Tuuri Innobase Oy --- InnoDB - transactions, row level locking, and foreign key support for MySQL See http://www.innodb.com, download MySQL-Max from http://www.mysql.com --------------------------------------------------------------------- Before posting, please check: http://www.mysql.com/manual.php (the manual) http://lists.mysql.com/ (the list archive) To request this thread, e-mail <[EMAIL PROTECTED]> To unsubscribe, e-mail <[EMAIL PROTECTED]> Trouble unsubscribing? Try: http://lists.mysql.com/php/unsubscribe.php
