I observed that turning on writeThrough with writeBehind slows down performance(i.e. time data reaches listeners) greatly. I tried setting the flush frequency to 0 and the flush size to 1 billion, and so the flushes are not even happening yet, and still the performance is slow. I am wondering where the slowdown is occurring? Where is the flush buffer located (heap/off-heap/disk/etc.) and it is configurable?
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