[Xen-users] Re: Virtualization vs. Cassandra and Hadloop

[Edward Capriolo <edlinuxguru@xxxxxxxxx>]

On Thu, May 6, 2010 at 10:02 PM, Dennis <arsenepark@xxxxxxxxxxxx> wrote:

Please check out this PNG image from attachment or from Google docs: http://docs.google.com/drawings/pub?id=1P3jdSddseG1oSYrtjREWcajizxmxoRIhUHCEw4sDi3k&w=771&h=624

So, what I want to do is something like a private cloud storage solution.

I belive the http servers and application servers should be set up on virtual VMs, but what about the Cassandra and Hadloop servers, should their be set up on VMs or directly on physical machines? If they should be set up on VMs, the data of Cassandra and Hadloop should be stored in local storage or a Storage Repository?

Thanks,

Dennis

Dennis, 

Looks like fun :)

Either architect is fine depending on your usage patterns. I have tried running cassandra on non-dedicated nodes. I have noticed that if cassandra gets CPU starved the gossip protocol detects nodes as down and that is a bad thing. so the danger is that very CPU intensive Hadoop jobs could starve our cassandra. Cassandra runs pretty even as I see except when it does its anti-compaction and repairs.

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