HDFS结点之间的交互图

基本抄自象书,我只是加了几条线





注: NameNode只提供元数据,数据交换在客户端和DataNode之间直接发生,以免NameNode成为瓶颈



注:默认情况下,写入的数据会有三份复本,分布在两个机架上(鸡蛋不放在同一个篮子里)

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