Re: Could rados pool support tree view feature ?

[Jeff Wu <cpwu@tnsoft.com.cn>]

Hi Greg ,

Thanks!

Jeff

On Tue, 2011-12-20 at 14:38 +0800, Gregory Farnum wrote:
> Unfortunately pools are completely flat namespaces, and there's no
> hierarchical relationship between pools (well, really it's a feature,
> not something unfortunate). So any tree structure would need to be a
> completely external thing, which I guess you would probably do with
> naming conventions and some wrapper scripts.
> -Greg
> 
> On Mon, Dec 19, 2011 at 5:47 PM, Jeff Wu <cpwu@tnsoft.com.cn> wrote:
> > Hi ,Tommi
> > Thank you very much.
> >
> > 00011 and 00012 are sub-pools ,we want to map our iaas devices topology
> > view meta data to these these sub-pools as a reference model.
> >
> > On Tue, 2011-12-20 at 01:16 +0800, Tommi Virtanen wrote:
> >> On Sun, Dec 18, 2011 at 22:51, Jeff Wu <cpwu@tnsoft.com.cn> wrote:
> >> > Could rados pool support tree view feature ?for instance :
> >> >
> >> > $rados lspools -m 172.16.10.10
> >> > data
> >> > metadata
> >> > rbd
> >> > Product:00000001
> >> > ├── 00011
> >> > │   └── 00012
> >> > |        └── 00013
> >>
> >> What type are the 00011 and 00012 entries? Are they pools or objects,
> >> or what? RADOS pools are flat namespaces of objects, there's no tree
> >> structure there.
> >>
> >> You should be able to write that easily, for example less than 100
> >> lines of Python using the "rados" module gets you the listing of the
> >> pools and the objects in them, and then you can use whatever your
> >> custom logic is for creating that tree shape.
> >>
> >> The Ceph team pretty much starts with the assumption that your pools
> >> are going to have at least millions of objects, so it's unlikely we'll
> >> write pretty visual navigation apps listing individual objects. The
> >> output would just be too long to be useful.
> >
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