Re: [reiserfs-dev] Re: Ext2 directory index: ALS paper and benchmarks

From: Daniel Phillips (
Date: Sat Dec 08 2001 - 21:47:31 EST

On December 8, 2001 08:55 pm, Hans Reiser wrote:
> Daniel, you didn't mention though whether leaking collision bits is a
> problem for Htrees. Is it? Do you need to rehash every so often to
> solve it? Or it is rare enough that the performance cost can be ignored?

It's a problem of course, and I put considerable effort into handling it. I
never have to rehash because the htree isn't a hash table, it's a tree of
hash ranges. I explicitly flag every instance where a collision could force
a search to continue in a successor block. Even though it's every rare, it
does happen and it has to be handled. This is described in some detail in my

After all the effort that went into this, the result was just a few lines of
code, which was nice.

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