Rack Awareness actually should be called Switch Awareness, and that’s what people typically do: Nodes in a rack are at the same switch, also you should have balanced capacity across racks/switches for a balanced distribution.
So you definitely want to rearrange your setup, especially if your cluster grows larger. Kai Am 04.07.2014 um 03:31 schrieb sunww <[email protected]>: > Hi > I have two questions about rack awareness. > > 1、I installed a hadoop2.2 , hbase0.96 cluster， which have 2 racks. > rack1 have 10 machines , rack2 have 5 machines. Because of 3 replicas, rack2 > will store more data then rack1. > Maybe I need to move some machines from rack2 to rack1? > If I had more racks, only one have 5 machines and the others have 10 > machines, Will data unbalance more serious? > > 2、If some racks share the same power and switch, is rack awareness necessary > ? > > > Thanks Kai Voigt Am Germaniahafen 1 [email protected] 24143 Kiel +49 160 96683050 Germany @KaiVoigt
