On 10/14/2011 05:38 PM, MORITA Kazutaka wrote:
>
>> Good idea. I am totally fond of this feature, it makes sheepdog more
>> symmetrically attractive. IIUC, we need to implement 'sub sheepdog
>> cluster' concept.
>>
>> zone 0 1
>> + +
>> | |
>> subzone ------------ -----------
>> | | | | | |
>> + + + + + +
>> 0' 1' 2' '0 '1 '2
>>
>> I can not simply guess how hard it is to implement. I'll look at this
>> concept after Kazum refactor the membership code, probably after 0.3.0
>> release.
>> Kazum, any comment for this idea?
> I don't yet fully understand the idea. When we want to have 2 copies
> in zone 0 and 1 copy in zone1, how to specify it with subzone?
>
>
> Thanks,
>
> Kazutaka
Grr, why my drawing get distorted by thunderbird.
how about bellow steps? suppose we only support 2 levels.
three nodes, n0,n1 for zone 0, n2 for zone 1.
top zone +
|
----------------------------
+ +
subzone 0 1
| |
--------------- -
node # # #
0 1 2
============================
set it globally:
n0: sheep store -z 0 -sz 0
n1: sheep store -z 0 -sz 1
n2: sheep store -z 1 -sz 0
one of 3 nodes: collie cluster format --zone_copies 2 --subzone_copies
0,2 --subzone_copies 1,1
============================
or set it at zone level:
n0: sheep store -z 0 -sz 0
n1: sheep store -z 0 -sz 1
n2: sheep store -z 1 -sz 0
one of n0, n1: collie cluster format --copies 2
n2: collie cluster format --copies 1
after all the sub-zones get formated, the top level cluster
automatically begins to work.
Thanks,
Yuan
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