2014-01-14---Hadoop的基础学习(八)---HDFS的HA机制及Hadoop集群搭建
1.HA的简介BackgroundPriortoHadoop2.0.0,theNameNodewasasinglepointoffailure(SPOF)inanHDFScluster.EachclusterhadasingleNameNode,andifthatmachineorprocessbecameunavailable,theclusterasawholewouldbeunavailab