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What is DDL Challenges in Galera Clusters about?

Galera replication ensures that DDL changes are replicated in the same total order as other transactions across all nodes to maintain schema consistency. During a schema upgrade like adding a key, DML statements on other nodes continue executing in parallel but must wait for the DDL to finish before committing. Process lists show the DDL statement in an "altering table" state while DML remains queued waiting for pre-commit. This total order isolation prevents inconsistencies from different nodes having diff

Author

Cosmin Cioranu

Language

EN