On 06/17/2011 02:43 AM, Lars Ellenberg wrote:
> On Thu, Jun 16, 2011 at 03:52:37PM -0600, Alan Robertson wrote:
>> On 06/16/2011 02:51 AM, Lars Ellenberg wrote:
>>> On Thu, Jun 16, 2011 at 09:48:20AM +0200, Florian Haas wrote:
>>>> On 2011-06-16 09:03, Lars Ellenberg wrote:
>>>>> With the current "unique=true/false", you cannot express that.
>>>> Thanks. You learn something every day. :)
>>> Sorry that I left off the "As you are well aware of,"
>>> introductionary phrase. ;-)
>>>
>>> I just summarized the "problem":
>>>
>>>>> Depending on what we chose the meaning to be,
>>>>> parameters marked "unique=true" would be required to
>>>>> either be all _independently_ unique,
>>>>> or be unique as a tuple.
>>> And made a suggestion how to solve it:
>>>
>>>>> If we want to be able to express both, we need a different markup.
>>>>>
>>>>> Of course, we can move the markup out of the parameter description,
>>>>> into an additional markup, that spells them out,
>>>>> like<unique params="foo,bar" /><unique params="bla" />.
>>>>>
>>>>> But using unique=0 as the current non-unique meaning, then
>>>>> unique=<small-integer-or-even-named-label-who-cares>, would
>>>>> name the scope for this uniqueness requirement,
>>>>> where parameters marked with the same such label
>>>>> would form a unique tuple.
>>>>> Enables us to mark multiple tuples, and individual parameters,
>>>>> at the same time.
>>> If we really think it _is_ a problem.
>> If one wanted to, one could say
>> unique=1,3
>> or
>> unique=1
>> unique=3
>>
>> Then parameters which share the same uniqueness list are part of the
>> same uniqueness grouping. Since RAs today normally say unique=1, if one
>> excluded the unique group 0 from being unique, then this could be done
>> in a completely upwards-compatible way for nearly all resources.
> That is what I suggested, yes.
> Where unique=0 is basically "not mentioning the unique hint".
Originally that's what I thought you said. But somehow read it
differently later. Perhaps I got my comment authorship cross-wired.
Wouldn't be hard to imagine ;-)
--
Alan Robertson<al...@unix.sh>
"Openness is the foundation and preservative of friendship... Let me claim
from you at all times your undisguised opinions." - William Wilberforce
_______________________________________________________
Linux-HA-Dev: Linux-HA-Dev@lists.linux-ha.org
http://lists.linux-ha.org/mailman/listinfo/linux-ha-dev
Home Page: http://linux-ha.org/
