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From Jabbar Azam <>
Subject Re: Redundancy inside a cassandra node
Date Sat, 08 Nov 2014 17:19:17 GMT
Hello Jack,

Some really good points. I never thought of issues with the JVM or OOM


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 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 <>
> *Sent:* Friday, November 7, 2014 3:24 PM
> *To:*
> *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

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