pg_zlog | Table replication for PostgreSQL nodes with Ceph and ZLog

pg_zlog is a C library. pg_zlog has no bugs, it has no vulnerabilities and it has low support. You can download it from GitHub.

The pg_zlog extension provides logical table replication for PostgreSQL. Replication is implemented by logging table mutations to a consistent shared-log called ZLog that runs on the Ceph distributed storage system. Strong consistency is provided by rolling the log forward on any PostgreSQL node before executing a query on a replicated table. This extension is based on pg_paxos that uses PL/pgSQL to implement a Paxos-based shared-log for recording table mutations. The primary difference between pg_zlog and pg_paxos is that pg_zlog decouples the log implementation from PostgreSQL, allowing it to support the high-performance ZLog log implementation, removing the overheads associated with maintaining a quorum of PostgreSQL nodes, and supporting flexible storage options like replication and erasure-coding that are provided by Ceph.