New in Google Code : a set of patches for MySQL
- SemiSyncReplication - block commit on a master until at least one slave acknowledges receipt of all replication events.
- MirroredBinlogs - maintain a copy of the master’s binlog on a slave
- TransactionalReplication - make InnoDB and slave replication state consistent during crash recovery
- UserTableMonitoring - monitor and report database activity per account and table
- InnodbAsyncIo - support multiple background IO threads for InnoDB
- FastMasterPromotion - promote a slave to a master without restart
Unfortunately these patches are only for MySQL 4, but support for version 5 is coming shortly.
They are released under the GPL.