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From Robert Evans <ev...@yahoo-inc.com>
Subject Re: dual power for hadoop in datacenter?
Date Mon, 09 Jan 2012 16:50:15 GMT
Be aware that if half of your cluster goes down, depending of the version and configuration
of Hadoop, there may be a replication storm, as hadoop tries to bring it all back up to the
proper number of replications.  Your cluster may still be unusable in this case.

--Bobby Evans

On 1/7/12 2:55 PM, "Alexander Lorenz" <wget.null@googlemail.com> wrote:

NN, SN and JT must have separated power adapter, for the entire cluster are dual adapter recommend.
For HBase and zookeeper servers / regionservers also dual adapters with seperated power lines
recommend.

- Alex

sent via my mobile device

On Jan 7, 2012, at 11:23 AM, Koert Kuipers <koert@tresata.com> wrote:

> what are the thoughts on running a hadoop cluster in a datacenter with
> respect to power? should all the boxes have redundant power supplies and be
> on dual power? or just dual power for the namenode, secondary namenode, and
> hbase master, and then perhaps switch the power source per rack for the
> slaves to provide resilience to a power failure? or even just run
> everything on single power and accept the risk that everything can do down
> at once?


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