Plover: parallel logging for replication systems

摘要

Logging and replication are commonly used recovery approaches in database systems. To guarantee that the database state is not corrupted due to system crash, database systems rely on a centralized logging method to persist log entries into a stable storage device; to prevent data loss due to device failure, a primary server in the database system periodically replicates its state to backup servers by copying log entries over networks. As the transaction execution in a modern database system is highly parallelized, the centralized logging with a single I/O channel tends to inhibit the scalability of the system. Meanwhile, log entries generated at high speed make a network with limited bandwidth a potential bottleneck for replication.