Re: Replicating Data Between Separate Data Centres

2015-12-15 Thread Kai Wang
er-latency-but-causally-correct writes to >> subsequent (disconnected) DR DC. >> >> >> >> From: Philip Persad >> Reply-To: "user@cassandra.apache.org" >> Date: Monday, December 14, 2015 at 3:37 PM >> >> To: Cassandra Users >> S

Re: Replicating Data Between Separate Data Centres

2015-12-14 Thread Philip Persad
gt; Date: Monday, December 14, 2015 at 3:37 PM > > To: Cassandra Users > Subject: Re: Replicating Data Between Separate Data Centres > > Hi Jeff, > > You're dead on with that article. That is a very good explanation of the > problem I'm facing. You're also right th

Re: Replicating Data Between Separate Data Centres

2015-12-14 Thread Philip Persad
t; From: Philip Persad > Reply-To: "user@cassandra.apache.org" > Date: Monday, December 14, 2015 at 3:11 PM > To: Cassandra Users > Subject: Re: Replicating Data Between Separate Data Centres > > Hi Jim, > > Thanks for taking the time to answer. By Causal Cons

Re: Replicating Data Between Separate Data Centres

2015-12-14 Thread Jeff Jirsa
;user@cassandra.apache.org" Date: Monday, December 14, 2015 at 3:37 PM To: Cassandra Users Subject: Re: Replicating Data Between Separate Data Centres Hi Jeff, You're dead on with that article. That is a very good explanation of the problem I'm facing. You're also right that, fascinat

Replicating Data Between Separate Data Centres

2015-12-14 Thread Philip Persad
Hi, I'm currently looking at Cassandra in the context of Disaster Recovery. I have 2 Data Centres, one is the Primary and the other acts as a Standby. There is a Cassandra cluster in each Data Centre. For the time being I'm running Cassandra 2.0.9. Unfortunately, due to the nature of my data,

Re: Replicating Data Between Separate Data Centres

2015-12-14 Thread Jim Ancona
Could you define what you mean by Casual Consistency and explain why you think you won't have that when using LOCAL_QUORUM? I ask because LOCAL_QUORUM and multiple data centers are the way many of us handle DR, so I'd like to understand why it doesn't work for you. I'm afraid I don't understand

Re: Replicating Data Between Separate Data Centres

2015-12-14 Thread Philip Persad
Hi Jim, Thanks for taking the time to answer. By Causal Consistency, what I mean is that I need strict ordering of all related events which might have a causal relationship. For example (albeit slightly contrived), if we are looking at recording an event stream, it is very important that the

Re: Replicating Data Between Separate Data Centres

2015-12-14 Thread Jeff Jirsa
. From: Philip Persad Reply-To: "user@cassandra.apache.org" Date: Monday, December 14, 2015 at 3:11 PM To: Cassandra Users Subject: Re: Replicating Data Between Separate Data Centres Hi Jim, Thanks for taking the time to answer. By Causal Consistency, what I mean is that I n