Mike, Thanks for you clarification. I'm interested in how to enable the following combinations. for case 1, can we do it without sending the HTTP head 'X-Newest'? for case 2, how to enable it? N=3, W=2, R=2 (Strong Consistence Mode) N=3, W=3, R=1 (Strict Consistence Mode)
Best Regards,
Edward Zhang(张华)
Michael Barton
<mike-launchpad@w
eirdlooking.com> To
Sent by: Hua ZZ Zhang/China/IBM@IBMCN,
palr...@gmail.com cc
Alex Yang <alex890...@gmail.com>,
"openstack@lists.launchpad.net"
12/11/2012 02:31 <openstack@lists.launchpad.net>,
PM Hai HJ Ji/China/IBM@IBMCN
Subject
Re: [Openstack] [swift] how to
configure NWR policy
Does any of our documentation say NRW are directly configurable? It's not
really quite that simple.
N is a property of the cluster, chosen when you build the ring.
W is always a simple majority of N.
R is generally 1 (eventually consisten reads), but the client can request
it be bumped to N (> highly consistent reads) using X-Newest.
But then there's stuff like we provide RYW consistency on default reads,
which can't really be modeled by NRW notation.
- Mike
On Mon, Dec 10, 2012 at 9:47 PM, Hua ZZ Zhang <zhu...@cn.ibm.com> wrote:
Alex, that make sense to me. thanks a lot. :-)
Best Regards,
Edward Zhang(张华)
Alex Yang ---12/11/2012 11:37:24 AM---Alex Yang <alex890...@gmail.com>
Alex Yang <
alex890714@gmail.
com>
To
12/11/2012 11:37
AM Hua ZZ Zhang/China/IBM@IBMCN,
cc
"openstack@lists.launchpad.net" <
openstack@lists.launchpad.net>, Hai
HJ Ji/China/IBM@IBMCN
Subject
Re: [Openstack] [swift] how to
configure NWR policy
Hi, Zhang,
Just add 'X-Newest: Ture' in the HTTP GET request.
2012/12/11 Hua ZZ Zhang <zhu...@cn.ibm.com>
Hi all,
I have a question about swift configuration for NWR policy.
According to some documents of Swift, NWR is configurable. The
general configuration is: N=3, W=2, R=1 or 2.
Swift can provide both models of consistency: strong and eventual.
But I can't find where to configure this option.
Any suggestion is appreciated!
Best Regards,
Edward Zhang(张华)
IBM China Software Development
Lab
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