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 <j...@basetechnology.com> 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 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 OOM issues. > 2. Replication redundancy is also for supporting higher load, not just > availability on node outage. > > -- Jack Krupansky > > *From:* Jabbar Azam <aja...@gmail.com> > *Sent:* Friday, November 7, 2014 3:24 PM > *To:* user@cassandra.apache.org > *Subject:* Redundancy inside a cassandra node > > Hello all, > > My work will be deploying a cassandra cluster next year. Due to internal > wrangling we can't seem to agree on the hardware. The software hasn't been > finished, but management are asking for a ballpark figure for the hardware > costs. > > The problem is the IT team are saying the nodes need to have multiple > points of redundancy > > e.g. dual power supplies, dual nics, SSD's configured in raid 10. > > > The software team is saying that due to cassandras resilient nature, due > to the way data is distributed and scalability that lots of cheap boes > should be used. So they have been taling about self build consumer grade > boxes with single nics, PSU's single SSDs etc. > > Obviously the self build boxes will cost a fraction of the price, but each > box is not as resilient as the first option. > > We don;t use any cloud technologies, so that's out of the question. > > My question is what do people use in the real world in terms of node > resiliancy when running a cassandra cluster? > > Write now the team is only thinking of hosting cassandra on the nodes. > I'll see if I can twist their arms and see the light with Apache Spark. > > Obviously there are other tiers of servers, but they won't be running > cassandra. > > > > > > Thanks > > Jabbar Azam >
