Manually Manage Direct Write Buffer in Frozen Cache Writes (#70399) #70558
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…0399) Manually managing the buffer has a number of upsides for us and no direct downsides as far as I can see. * We limit the number of syscalls for large writes by a factor of up to `8` (in practice it's probably mostly `8` when writing larger amounts of data) * Since we limit the write thread count to 28 the amount of direct memory used is limited * We eliminate the copying from heap -> off-heap under the lock in the channel's positional write * We eliminate allocating `ByteBuffer` instances in a hot loop when writing large regions
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Manually managing the buffer has a number of upsides for us and no direct downsides
as far as I can see.
8(in practice it's probably mostly8when writing larger amounts of data)ByteBufferinstances in a hot loop when writing large regionsbackport of #70399