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Here we’ll discuss some concepts about PerconaXtraDB Galera Cluster.
PerconaXtraDB Galera Cluster is a
virtually synchronous multi-master cluster for PerconaXtraDB. The Server replicates a transaction at commit time by broadcasting the write set associated with the transaction to every node in the cluster. The client connects directly to the DBMS and experiences behavior that is similar to native PerconaXtraDB in most cases. The wsrep API (write set replication API) defines the interface between Galera replication and PerconaXtraDB.
There are some limitations in PerconaXtraDB Galera Cluster that are listed here.