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Hadoop读文件_Hadoop读文件流程_HDFS读文件怎么做 - 树懒学堂
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Hadoop 读文件


HDFS – 读文件

  1. 客户端向NameNode发送读取请求
  2. NameNode返回文件的所有block和这些block所在的DataNodes(包括复制节点)
  3. 客户端直接从DataNode中读取数据,如果该DataNode读取失败(DataNode失效或校验码不对),则从复制节点中读取(如果读取的数据就在本机,则直接读取,否则通过网络读取)


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  Hadoop 写文件
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Hadoop 可靠性