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.n...@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 <ko...@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?
