[Gluster-devel] AFR write scheduling

Kevan Benson kbenson at a-1networks.com
Tue Nov 20 23:03:21 UTC 2007

Krishna Srinivas wrote:
> On Nov 21, 2007 2:09 AM, Székelyi Szabolcs <cc at avaxio.hu> wrote:
>> Kevan Benson wrote:
>>> I don't remember anything about the status of this, and I can't find it
>>> in the archives from a few minutes of searching, so I'll just ask.
>>> Is afr write scheduling planned for the future?  My understanding of AFR
>>> currently is that if you have a 4 node AFR, and you specify all .html
>>> files to be redundant at 2 locations and all .db files to be redundant
>>> in 3, you can expect the first 2 defined nodes to contain redundant
>>> .html files and the first 3 nodes to contain redundant .db files and the
>>> fourth node to be essentially empty (until the other nodes fill up?).
>>> Are there any plans to have it use a scheduler to decide which AFR nodes
>>> to write to?
>>> Is the solution just to wrap multiple AFRs in a unify and use the unify
>>> scheduler to achieve this?
>> See http://www.mail-archive.com/gluster-devel@nongnu.org/msg02201.html
> Correct.
> Note that previously supported "option replicate *html:2,*txt:1"
> pattern matching feature
> is moved out of AFR. It should be implemented using unify's switch.case
> Also check the following link which I just updated:
> http://www.gluster.org/docs/index.php/Understanding_AFR_Translator

Thanks both.  I know it was there somewhere, I was just having trouble 
locating it.

Krishna, any info on how switch.case is going to work?  Is it going to 
replace the block-size parameter of stripe as well?


-Kevan Benson
-A-1 Networks

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