Re: Redundancy inside a cassandra node

2014-11-08 Thread Jabbar Azam
Hello Jack, Some really good points. I never thought of issues with the JVM or OOM issues. Thanks Jabbar Azam On 8 November 2014 16:52, Jack Krupansky wrote: > About the only thing you can say is two specific points: > > 1. A more resilient node is great, but it in no ways reduces or elimi

Re: Redundancy inside a cassandra node

2014-11-08 Thread Jack Krupansky
About the only thing you can say is two specific points: 1. A more resilient node is great, but it in no ways reduces or eliminates the need total nodes. Sometimes nodes become inaccessible due to network outages or system maintenance (e.g., software upgrades), or the vagaries of Java JVM and

Re: Redundancy inside a cassandra node

2014-11-08 Thread Jabbar Azam
Hello Alexey, The node count is 20 per site and there will be two sites. RF=3. But since the software isn't complete and the database code is going through a rewrite we aren't sure about space requirements. The node count is only a guess, bases on the number of dev nodes in use. We will have bette

Re: Redundancy inside a cassandra node

2014-11-07 Thread Plotnik, Alexey
Cassandra is a cluster itself, it's not necessary to have redundant each node. Cassandra has replication for that. And also Cassandra is designed to run in multiple data center - am think that redundant policy is applicable for you. Only thing from your saying you can deploy is raid10, other don