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1.3.4. Linear Store
MRG 3 introduces a new Linear Store for persistent messages. The Linear Store allows the persistence journal to dynamically expand. This means that durable queues can be expanded without deleting and recreating them.
There is no way to upgrade from the MRG 2 journal. Changing to MRG 3 must be done from a clean store and all queues that use the journal must be redeclared.
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