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Re: pristine store database -- was: pristine store design

From: Johan Corveleyn <jcorvel_at_gmail.com>
Date: Tue, 16 Feb 2010 22:22:54 +0100

On Tue, Feb 16, 2010 at 8:15 PM, Greg Stein <gstein_at_gmail.com> wrote:
>>> Instead, we could not store size and mtime at all! :)
>> Or we could store both to perform simple consistency checks...
> Dunno about that, but the storage of SIZE is part of the (intended)
> algorithm for pristine storage. It is allowed to have a row in
> PRISTINE with SIZE==0 in order to say "I know about this pristine, and
> this row is present to satisfy integrity constraints with other
> tables, but the pristine has NOT been written into the store." Once
> the file *is* written, then the resulting size is stored into the
> table.

Shouldn't the marker value to indicate "pristine has NOT been written
into the store" be something like -1 instead of 0? Just taking into
account that there might be files that really have a size of 0 bytes.
These should be supported, shouldn't they?

OTOH, I guess a 0 bytes pristine has to be handled specially anyway
(what's the checksum of 0 bytes), no?

Received on 2010-02-16 22:23:29 CET

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