Lock

Exploring the design of a distributed read-write lock for PolarDB-X, this blog delves into the complexities and considerations of ensuring synchronized DDL execution in a distributed database environment.

This blog discusses the fatal problem of distributed metadata lock (MDL) deadlocks that can occur when distributed transactions and database definition language (DDL) statements execute concurrently across multiple database nodes. It explains the causes and presents a solution for detecting these distributed MDL deadlocks.