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From j.@nanthrax.net
Subject Re: Running a single cluster in multiple datacenters
Date Mon, 15 Jul 2013 21:56:06 GMT
Hi Niels,

it's depend of the number of replicas and the Hadoop rack configuration 
It's possible to have replicas on the two datacenters.

What's the rack configuration that you plan ? You can implement your 
own one and define it using the topology.node.switch.mapping.impl 


On 2013-07-15 23:49, Niels Basjes wrote:
> Hi,
> Last week we had a discussion at work regarding setting up our new
> Hadoop cluster(s).
> One of the things that has changed is that the importance of the
> Hadoop stack is growing so we want to be "more available".
> One of the points we talked about was setting up the cluster in such 
> a
> way that the nodes are physically located in two separate datacenters
> (on opposite sides of the same city) with a big network connection in
> between.
> Were currently talking about a cluster in the 50 nodes range, but 
> that
> will grow over time.
> The advantages I see:
> - More CPU power available for jobs.
> - The data is automatically copied between the datacenters as long as
> we configure them to be different racks.
> The disadvantages I see:
> - If the network goes out then one half is dead and the other half
> will most likely go to safemode because the recovering of the missing
> replicas will fill up the disks fast.
> What things should we consider also?
> Has anyone any experience with such a setup?
> Is it a good idea to do this?
> What are better options for us to consider?
> Thanks for any input.

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