GBase 8a 9.5.3 Adds Event-Driven Data Node Replacement to Cut Recovery Time

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GBase 8a version 9.5.3.28.18R1_Patch.8 introduces an event-based method called eventMode for replacing failed data nodes in a cluster. Unlike the traditional redistribution approach, eventMode synchronises change events between nodes to restore data without requiring a full cluster rebalance. DBAs invoke the feature via a --feventMode flag in the replace.py script, provided any ongoing redistribution is paused beforehand. The process covers verification, data packet synchronisation, and metadata recovery, returning the replaced node to an OPEN state upon completion. While eventMode speeds up recovery and decouples it from long-running rebalance tasks, it generates a high volume of internal events and may cause brief performance fluctuations.

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