Re: [gentoo-dev] Re: [packagekit] Inviting you to project "PackageMap"

["Tiziano Müller" <dev-zero@gentoo.org>]

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Am Freitag, den 12.06.2009, 11:54 +0200 schrieb Sebastian Pipping:
> Richard Hughes wrote:
> > I'm slightly worried about it being called a service. Is it going to
> > be a new process that just does the mapping or is this a bad choice of
> > words? If it is a new process then I'm not sure such a thing will
> > catch on.
> 
> I'm not yet sure about how a mapper will keep it's data
> fresh as the use of it is dependent on that.
> Ignore my "service" for now.
> 
> 
> > I'm also worried that a package manager has to read in and parse
> > thousands of small files.
> 
> While you mention "package manager" - with the current concept
> the data will not be precise enough for use with a package manager.
> 
> 
> > Why did you decide to write each project as
> > a single xml file?
> 
>  - The other 99% of the database stay valid XML if a single
>    file is invalid
> 
>  - To better fit the version controlled environment
> 
> 
> > Parsing and reading 10,000 files (in multiple directories) might take
> > a few seconds, and would have to be copied into memory (few Mb) to
> > query quickly.
> 
> Correct.
> 
> 
> > Which has to be invalidated if any of the files or
> > directories change. Why didn't you just put them in a sqlite database
> > that can be queried in a few ms, without dragging in an xml parser?
> > Also 10,000 files take up way more space (and takes longer to install
> > and update) than a single database file.
> 
> I like your idea about sqlite.  Maybe keeping the data to edit XML
> and query and sqlite export snapshot is something to try.
Why not use a XML database like dbxml?
Maybe you could just specify the XML files as storage and then dbxml
would do the rest.


> 
> 
> > XML might be
> > useful for storing the data, but not for querying.
> 
> Good point.

Using XPath and XQuery you can do queries on XML as well.

Cheers,
Tiziano

-- 
Tiziano Müller
Gentoo Linux Developer, Council Member
Areas of responsibility:
  Samba, PostgreSQL, CPP, Python, sysadmin, GLEP Editor
E-Mail   : dev-zero@gentoo.org
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