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                ### 數據級別 1 Byte = 8 bit 1 KB = 1024 Bytes = 8192 bit MB - GB - TB - PB - EB - ZB(全球數據級別) - YB - BB - NB - DB ### Hadoop > 分布式開源框架。支持成千上萬的節點,每個節點依靠本地的計算和存儲,在應用層提供高可用。將硬件錯誤看成一個常態 #### 模塊 - Common:工具類/RPC通信框架 - HDFS:hadoop 分布式文件系統 將一個文件切成小文件存儲在不同的節點上; 架構:主從架構 一個namenode(主) 多個datanode(從) 助理:secondarynamenode - YARN:集群的資源調度框架 - MapReduce:分布式計算框架
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