Galera wsrep provider is a dlopenable generic replication library which implements the wsrep provider API. It provides very efficient synchronous replication, and multi-master and "parallel applying" capabilities for opaque data buffers. Its primary focus is data consistency. A transaction is either applied on every node, or not at all. It works anywhere TCP works, including on WAN, and can utilize UDP multicast where available. It is used by the MySQL-wsrep patch project to create true multi-master MySQL/InnoDB clusters.
|Tags||replication high availability Clustering Tools Clustering/Distributed Networks|
|Implementation||C C++ STL Boost|
Release Notes: This release fixed possible data inconsistency due to indeterministic certification index purge and exceptions when using high evs.send_window and evs.user_send_window settings. It also sports some performance and memory optimizations for huge writesets.
Release Notes: This release contains important bugfixes, new features, and performance improvements. Fixed: causal reads guarantee violation at cluster partitioning, exclusive keys didn't produce dependency on shared keys, a race condition in the desync method (could break RSU), IST not working across different EC2 accessibility zones (and similar), and causal reads timeout configuration was ignored. Added: an wsrep_incoming_addresses status variable, the ability to specify several node addresses in a gcomm:// URL. Significant speedups and memory footprint reduction on ranged queries.
Release Notes: This release fixes broken IST between 32-bit and 64-bt architectures, a possible cluster crash on arbitrator reconnect, and a number of other minor issues. It adds support for "shared" keys, a gcs.sync_donor boolean parameter to keep state donor temporally synced with the cluster (useful for non-blocking state transfers like xtrabackup and IST), and support for Solaris 11 (x86 only).
Release Notes: This GA release fixes issues found in the beta and adds a start/stop service script for the Galera arbitrator.
Release Notes: This is a new major feature release featuring incremental state transfers (replaying of missing transactions to catch up with the cluster). This is a beta preview.