> On Mar 17, 2023, at 1:46 PM, Jeremy Hanna <jeremy.hanna1...@gmail.com> wrote:
>
>
>
> One much more graceful element of UCS is that instead of what was previously
> done with compaction strategies where the server just shuts down when running
> out of space - forcing system administrators to be paranoid about headroom.
> Instead UCS has a target overhead (default 20%). First since the ranges are
> sharded, it makes it less likely that there will be large sstables that need
> to get compacted to require as much headroom, but if it detects that there
> is a compaction that will violate the target overhead, it will log that and
> skip the compaction - a much more graceful way of handling it.
Skipping doesn’t really handle it though?
If you have a newly flushed sstable full of tombstones and it naturally somehow
triggers you to exceed that target overhead you never free that space? Usually
LCS would try to reduce the scope of the compaction, and I assume UCS will too?
