Re: Making metadata storage SQL-driven

[Jamie McCracken <jamiemcc blueyonder co uk>]

Luis Villa wrote:
> On 9/1/05, Jamie McCracken <jamiemcc blueyonder co uk> wrote:
>
> > Rodrigo Moya wrote:
> >
> > > On Thu, 2005-09-01 at 12:10 +0100, Jamie McCracken wrote:
> > >
> > >
> > > > Christian Neumair wrote:
> > > >
> > > >
> > > > > I really wonder why we rely on files for our metadata. It has issues [1]
> > > > > where a synchronous fopen and read or write operation would really take
> > > > > too long, requiring us to schedule reads/writes. Without doing any
> > > > > performance measures, I think this could significantly speed up our
> > > > > metadata code for big directories. I think we should do the same as
> > > > > beagle, and rely on a tiny SQL server, doing all our metadata operations
> > > > > synchronously. I'm not a big fan of EAs, since they seem to be some
> > > > > different flavors and inconsistencies among various implementations.
> > > > >
> > > > > [1] http://makeashorterlink.com/?Y364247BB
> > > >
> > > > you are correct and thats why Im building such a system for Gconf/common
> > > > config system, general metadata server, schematic storage (like winFS),
> > > > indexing and anything else that needs fast structured storage.
> > > >
> > > > My system is called DDS (data desktop server) and is simply a dbus
> > > > wrapper around the embedded mysql DB.
> > >
> > >
> > > please don't use MySQL directly! First, you will impose users to install
> > > and configure a DB server, which might not be possible in all cases.
> >
> > the *embedded* version of mysql is just a shared object - you dont need
> > to install the full mysql to get it. RPMs for the *embedded* version are
> > on mysql's website. The *embedded* mysql is the same as sqlite in that
> > regard.
>
>
> I presume that ny metadata system really should be part of the
> platform so that other apps can access it; that would rule out mysql
> on licensing concerns.

with a dbus wrapper around it the license becomes irrelevant. The dbus 
server end of DDS will be GPL but the client end libDDS will be LGPL. 
IPC is a great way to eliminate GPL dependencies!

> Luis


--
Mr Jamie McCracken
http://www.advogato.org/person/jamiemcc/