> In this case, it means that if there is a network split between the 2 > datacenters, it is impossible to get the quorum, and all connections will be > rejected. Yes.
> Is there a reason why Cassandra uses the Quorum consistency level ? I would guess to ensure there is a single, cluster wide, set of permissions. Using LOCAL or one could result in some requests that are rejected being allowed on other nodes. Cheers ----------------- Aaron Morton Freelance Cassandra Developer New Zealand @aaronmorton http://www.thelastpickle.com On 1/03/2013, at 6:40 AM, Jean-Armel Luce <jaluc...@gmail.com> wrote: > Hi, > > > I am using Cassandra 1.2.2. > There are 16 nodes in my cluster in 2 datacenters (8 nodes in each > datacenter). > I am using NetworkTopologyStrategy. > > For information, I set a RF = 6 (3 replicas in each datacenter) > > With 1.2.2, I am using the new authentication backend PasswordAuthenticator > with the authorizer CassandraAuthorizer. > > In the documentation > (http://www.datastax.com/docs/1.2/security/security_keyspace_replication#security-keyspace-replication), > it is written that for all system_auth-related queries, Cassandra uses the > QUORUM consistency level. > > In this case, it means that if there is a network split between the 2 > datacenters, it is impossible to get the quorum, and all connections will be > rejected. > > Is there a reason why Cassandra uses the Quorum consistency level ? > Maybe a local_quorum conssitency level (or a one consistency level) could do > the job ? > > Regards > Jean Armel
