MemoryProperties
The in-memory provider's settings, wow.memory.*, as each provider has its group (wow.kafka.*, wow.mongo.*).
Properties
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The messages each partition of the topics in the JVM keeps (wow.transport memory, or auto in development without a transport), at least one: past it, a partition drops its oldest, as a broker's retention does, and a subscription behind them reads on from the oldest kept, an offset gap. The topics stay bounded however long the node runs.