?????? data loss in different DC

2017-09-28 Thread Peng Xiao
Thanks All -- -- ??: "Jeff Jirsa";; : 2017??9??28??(??) 9:16 ??: "user"; ????: Re: data loss in different DC Your quorum writers are only guaranteed to be on half+1 nodes - there??s no guarantee which node

Re: 回复： data loss in different DC

2017-09-28 Thread Reynald Bourtembourg
user@cassandra.apache.org>; *主题:* Re: data loss in different DC If you're writing into DC1 with CL = LOCAL_xxx, there is no guarantee to be sure to read the same data in DC2. Only repair will help you On Thu, Sep 28, 2017 at 11:41 AM, Peng Xiao <2535...@qq.com

Re: data loss in different DC

2017-09-28 Thread Jeff Jirsa
Your quorum writers are only guaranteed to be on half+1 nodes - there’s no guarantee which nodes those will be. For strong consistency with multiple DCs, You can either: - write at quorum and read at quorum from any dc, or - write each_quorum and read local_quorum from any dc, or - write at loc

Re: 回复： data loss in different DC

2017-09-28 Thread Jacob Shadix
; > *发送时间:* 2017年9月28日(星期四) 下午5:45 > *收件人:* "user" ; > *主题:* Re: data loss in different DC > > If you're writing into DC1 with CL = LOCAL_xxx, there is no guarantee to > be sure to read the same data in DC2. Only repair will help you > > On Thu, Sep 28, 2017 at

Re: 回复： data loss in different DC

2017-09-28 Thread Reynald Bourtembourg
? --?0?2?0?2-- *??:*?0?2"DuyHai Doan";; *:*?0?22017??9??28??(??) 5:45 *??:*?0?2"user"; *????:*?0?2Re: data loss in different DC If you're writing into DC1 with CL = LOCAL_xxx, there is no guarantee to be sure to read t

?????? data loss in different DC

2017-09-28 Thread Peng Xiao
even with CL=QUORUM,there is no guarantee to be sure to read the same data in DC2,right? then multi DCs looks make no sense? -- -- ??: "DuyHai Doan";; : 2017??9??28??(??) 5:45 ??: "user"; ????: Re: data

Re: data loss in different DC

2017-09-28 Thread Peng Xiao
very sorry for the duplicate mail. -- Original -- From: "";<2535...@qq.com>; Date: Thu, Sep 28, 2017 07:41 PM To: "user"; Subject: data loss in different DC Dear All, We have a cluster with one DC1:RF=3,another DC

data loss in different DC

2017-09-28 Thread Peng Xiao
Dear All, We have a cluster with one DC1:RF=3,another DC DC2:RF=1,DC2 only for ETL,but we found that sometimes we can query records in DC1,while not able not find the same record in DC2 with local_quorum.How it happens?looks data loss in DC2. Could anyone please advise? looks we can only run re

Re: data loss in different DC

2017-09-28 Thread DuyHai Doan
If you're writing into DC1 with CL = LOCAL_xxx, there is no guarantee to be sure to read the same data in DC2. Only repair will help you On Thu, Sep 28, 2017 at 11:41 AM, Peng Xiao <2535...@qq.com> wrote: > Dear All, > > We have a cluster with one DC1:RF=3,another DC DC2:RF=1 only for ETL,but > w

data loss in different DC

2017-09-28 Thread Peng Xiao
Dear All, We have a cluster with one DC1:RF=3,another DC DC2:RF=1 only for ETL,but we found that sometimes we can query records in DC1,while not able not find the same record in DC2 with local_quorum.How it happens? Could anyone please advise? looks we can only run repair to fix it. Thanks, P