Re: [Patch 2/7] tabled: add <Cell> element

[Jeff Garzik <jeff@garzik.org>]

On 01/14/2010 11:11 PM, Pete Zaitcev wrote:
> Make the cell configurable. Among other things we need this for is
> that you cannot migrate a tabled over when DB format changes, short
> of running 2 CLDs.
>
> We also add a few thoughts to the documentation, prompted by re-reading
> of the document while adding the clause for<Cell>.
>
> Signed-Off-By: Pete Zaitcev<zaitcev@redhat.com>
>
> ---
>   doc/etc.tabled.conf |    7 +++++++
>   doc/setup.txt       |   40 +++++++++++++++++++++++++++++++++++++---
>   server/cldu.c       |    4 ++++
>   server/config.c     |   11 +++++++++++
>   server/server.c     |    2 +-
>   server/tabled.h     |    1 +
>   6 files changed, 61 insertions(+), 4 deletions(-)

Strictly speaking, this is wrong, but I applied so that we may make 
forward progress.

The definition of a "cell" (or "cel") is everything within a single CLD 
namespace.

It is a design requirement that any number of separate tabled instances 
may be run within a single cell.  The differentiating factor is 
pathname.  Thus, one tabled instance may store files in
	cld://cld.mysite.com/table1/
and a totally separate, parallel instance of table may store its files in
	cld://cld.mysite.com/table2/

Provisioning another tabled instance should be as simple as creating a 
new directory in CLD, and running the tabled/chunkd nodes.

Thus, the user interface should be CLD hostname + pathname, not "cell name."

	Jeff