> best known metadata storage engine for a distributed filesystem, hopsfs

Not even close. I don't even see anything I'd call a filesystem mentioned on your web page. I missed FAST this year, and apparently you had a paper about using Hops as a building block for a non-POSIX filesystem - i.e. not a filesystem in my and many others' opinion - but it's not clear whether it has ever even been used in production anywhere let alone become "best known" in that or any other domain. I know you're proud, perhaps you have reason to be, but please.