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After a bit of digging, yes but no.
So turns out it's a bit more involved than a straight up 80% == bad scenario. ZFS by default divides[1] each vdev (RAIDZ or mirror set) into ~200 allocation regions called metaslabs[2].
When allocating from a metaslab[3] it will check if the free space in that metaslab is below the threshold. It seems the threshold was changed from 20% free space to 4%[4] at some point.
However, as noted that threshold is per metaslab. So if the pool is fragmented, even though the overall free space in the pool is above the 4% threshold, there might be metaslabs with less than that free, which will lead to the expensive best-fit search.
[1]: https://www.delphix.com/blog/delphix-engineering/openzfs-cod...
[2]: http://dtrace.org/blogs/ahl/2012/11/08/zfs-trivia-metaslabs/
[3]: https://github.com/openzfs/zfs/blob/master/module/zfs/metasl...
[4]: https://www.truenas.com/community/threads/zfs-tweak-for-firs...
Oh there’s this great thing called files.
You put your config in there and then you can copy them anywhere, even between AWS accounts.
They work great with fucking shell scripts. https://github.com/brandonhilkert/fucking_shell_scripts
You can use FSS on docker, kubernetes, bare metal (otherwise known as computers), Windows, Mac, Amiga, etc.
Dropping a link to `rlwrap` in case anyone is not familiar with it:
https://github.com/hanslub42/rlwrap
Note that I've never tried it myself with the mysql/mariadb CLI, but I have used it with other tools, and it's brilliant.