Date: Mon, 7 May 2012 13:23:25 -0700 From: Stanislav Sedov <stas@FreeBSD.org> To: Baptiste Daroussin <bapt@FreeBSD.org> Cc: freebsd-arch@FreeBSD.org Subject: Re: Switching /etc/*.db from bdb to tinycdb Message-ID: <20120507132325.c4bfae2d.stas@FreeBSD.org> In-Reply-To: <20120502114115.GG31034@azathoth.lan> References: <20120502114115.GG31034@azathoth.lan>
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On Wed, 2 May 2012 13:41:15 +0200 Baptiste Daroussin <bapt@FreeBSD.org> mentioned: > Hi, > > I plan to work on switching all the /etc/*.db files from bdb 1.85 to cdb (using > the tinycdb implementation) > > Reason for doing that: > 1/ we use the *.db files as a constant database on recreating them using > *_mkdb(8) commands > 2/ bdb 1.85 database are endianness dependant which can cause problem if I want > pkgng to be able to create users when cross installing packages (like adding > packages in a mips eb chroot environment on an amd64 host) > 3/ the tinycdb API is clean and easy to use (I find it easier and cleaner to > deal with it) > 4/ tinycdb is public domain so not problem for us to use it. > > On the side effects, I'm not sure this is relevant but tinycdb is also faster to > read then bdb 1.85. > > How do I plan to do it. > > I plan to import the read part or tinycdb into libc and the write part into > libutil (to avoid cluttering libc). > > Why importing to libc? to allow all the get*ent to parse the /etc/*.db files. > > How to implment it? slowly with backward compatibility: > for each kind of files: try to open with cdb, if fail fall back to bdb. > > I plan to rewrite all the *_mkdb for make them use cdb. > > Link for tinycdb: > http://www.corpit.ru/mjt/tinycdb.html > > Any opinion, ideas, advices on this? Did you look at leveldb [1], btw? It seems to be very fast, better supported, and support some advanced features that can be useful for other base applications (like transactions, custom sorting, snapshots). It's distributed under BSD license. [1] http://code.google.com/p/leveldb/ -- Stanislav Sedov ST4096-RIPE () ascii ribbon campaign - against html e-mail /\ www.asciiribbon.org - against proprietary attachments
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