A couple of question about replication

[Ostap Bender <os...@hotmail.com>]

Hi All,
I don't have any experience with Cassandra but we are about to evaluate it for one of our project and a few questions had came up, namely:--	Let say we have replica set with 9 nodes.	There is a write with consistency 1 and replication "majority", so 5 nodes will get the data (say 1 through 5).	There is a read on the node #6 that doesn't have data from the previous write.	So the node #6 gets the data from the other node (say #1) that has it.
	Question: 	Will the node #6 have the data now to serve subsequent request without going to the other nodes?
	Question: 	Is it possible to do a local delete of the data without replicating this delete? --
Thank you,Ostap 		 	   		  

Re: A couple of question about replication

[Tyler Hobbs <ty...@datastax.com>]

It seems like you have a few concepts about consistency levels and
replication confused.  It might be more useful to do some background
reading first:

- http://www.datastax.com/docs/1.2/cluster_architecture/data_distribution
-
http://www.datastax.com/docs/1.2/cluster_architecture/about_client_requests
- http://www.datastax.com/docs/1.2/dml/data_consistency


On Fri, Apr 12, 2013 at 6:03 PM, Ostap Bender <os...@hotmail.com>wrote:

> Hi All,
>
> I don't have any experience with Cassandra but we are about to evaluate it
> for one of our project and a few questions had came up, namely:
> --
> Let say we have replica set with 9 nodes.
> There is a write with consistency 1 and replication "majority", so 5 nodes
> will get the data (say 1 through 5).
> There is a read on the node #6 that doesn't have data from the previous
> write.
> So the node #6 gets the data from the other node (say #1) that has it.
>
> Question: Will the node #6 have the data now to serve subsequent request
> without going to the other nodes?
>
> Question: Is it possible to do a local delete of the data without
> replicating this delete?
> --
>
> Thank you,
> Ostap
>



-- 
Tyler Hobbs
DataStax <http://datastax.com/>