[Openstack] [swift] how to configure NWR policy
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 inline: ecblank.gifinline: 1F033383.gif___ Mailing list: https://launchpad.net/~openstack Post to : openstack@lists.launchpad.net Unsubscribe : https://launchpad.net/~openstack More help : https://help.launchpad.net/ListHelp
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 ___ Mailing list: https://launchpad.net/~openstack Post to : openstack@lists.launchpad.net Unsubscribe : https://launchpad.net/~openstack More help : https://help.launchpad.net/ListHelp -- 杨雨 Email: alex890...@gmail.com GitHub: https://github.com/AlexYangYu Blog:http://alexyang.sinaapp.com Weibo: http://www.weibo.com/alexyangyu 1F033383.gifecblank.gif___ Mailing list: https://launchpad.net/~openstack Post to : openstack@lists.launchpad.net Unsubscribe : https://launchpad.net/~openstack More help : https://help.launchpad.net/ListHelp
Re: [Openstack] [swift] how to configure NWR policy
Alex, that make sense to me. thanks a lot. :-) Best Regards, Edward Zhang(张华) Alex Yang alex890714@gmail .com To Hua ZZ Zhang/China/IBM@IBMCN, 12/11/2012 11:37 cc AMopenstack@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 ___ Mailing list: https://launchpad.net/~openstack Post to : openstack@lists.launchpad.net Unsubscribe : https://launchpad.net/~openstack More help : https://help.launchpad.net/ListHelp -- 杨雨 Email: alex890...@gmail.com GitHub: https://github.com/AlexYangYu Blog:http://alexyang.sinaapp.com Weibo: http://www.weibo.com/alexyangyu inline: ecblank.gifinline: 70384012.gifinline: graycol.gifinline: pic17543.gif___ Mailing list: https://launchpad.net/~openstack Post to : openstack@lists.launchpad.net Unsubscribe : https://launchpad.net/~openstack More help : https://help.launchpad.net/ListHelp
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)* [image: Inactive hide details for Alex Yang ---12/11/2012 11:37:24 AM---Alex Yang alex890...@gmail.com]Alex Yang ---12/11/2012 11:37:24 AM---Alex Yang alex890...@gmail.com *Alex Yang alex890...@gmail.com* 12/11/2012 11:37 AM To 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* 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 ___ Mailing list: *https://launchpad.net/~openstack*https://launchpad.net/~openstack Post to : *openstack@lists.launchpad.net*openstack@lists.launchpad.net Unsubscribe : *https://launchpad.net/~openstack*https://launchpad.net/~openstack More help : *https://help.launchpad.net/ListHelp*https://help.launchpad.net/ListHelp -- 杨雨 Email: *alex890...@gmail.com* alex890...@gmail.com GitHub: *https://github.com/AlexYangYu*https://github.com/AlexYangYu Blog:*http://alexyang.sinaapp.com*http://alexyang.sinaapp.com/ Weibo: *http://www.weibo.com/alexyangyu*http://www.weibo.com/alexyangyu ___ Mailing list: https://launchpad.net/~openstack Post to : openstack@lists.launchpad.net Unsubscribe : https://launchpad.net/~openstack More help : https://help.launchpad.net/ListHelp ___ Mailing list: https://launchpad.net/~openstack Post to : openstack@lists.launchpad.net Unsubscribe : https://launchpad.net/~openstack More help : https://help.launchpad.net/ListHelp
Re: [Openstack] [swift] how to configure NWR policy
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, PMHai 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
