It seems, that message spooling for persistent queue messages is already implemented long time ago (in 4.0.x). But messages are spooled only during checkpoint (which happens every 5 minutes or so). Is it possible to configure how often messages are checkpointed? Between checkpoints producers are blocked, if queue is full. It seems that there was some kind of fix, witch doesn't block the producer, but spools messages directly to disk. But it was only for non-persistent messages right? Is it possible to implement the same in journaled store. If queue is full, instead of blocking producer, put messages directly to persistent store, or trigger checkpoint. I was testing using 4.2 latest snapshot.
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