BlueStore BitMap allocator under Luminous

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Hi,

I was wondering how stable useful the Bitmap allocator is vs the Stupid
allocator with BlueStore under Luminous.

In the master branch the Bitmap one is now the default, but why?
Searching for this I couldn't find a proper reason.

The reason I'm asking is that I'm seeing some issues with BlueStore OSDs
running into BlueFS allocation issues when they are filling up.
(WAL+DB+DATA on same SSD).

So one of the things I wanted to try is to switch to Bitmap, but I'd
like to check the stability and reasoning behind it first.

Thanks,

Wido



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