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Re: Path lookup table (was: Re: Locking design (was Re: svn commit: r9885 - trunk/notes))

From: Greg Hudson <ghudson_at_MIT.EDU>
Date: 2004-05-29 03:46:51 CEST

On Fri, 2004-05-28 at 02:51, Branko ╚ibej wrote:
> (dir-id, name, [txn-id]) -> info

[...]
> You'll notice that I didn't spend too much time worrying about how this
> design scales from locks/acls -- which are expected to be fairly
> "sparse" in the tree -- to a full-blown directory index. There are some
> tricky questions to answer; for example, I'm still not sure how to avoid
> having to write a zillion index entries every time a directory changes,
> either directly or through bubble-up; or how to keep the constant-time
> nature of directory copies. It might be possible to even avoid
> "physical" bubble-up completely. Anyway, these ruminations need a lot of
> evolving first.

I think it's important to answer these questions before we look at a
table of this nature as a future direction for FS directory lookups. I
suspect the original FS designers did consider using a separate DB
association for each directory entry, and decided it would be too
inefficient.

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Received on Sat May 29 03:47:18 2004

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