hadoop学习datanode 的相关内容

文章 2023-08-03 来自：开发者社区

Hadoop基础学习---4、HDFS写、读数据流程、NameNode和SecondaryNameNode、DataNode

1、HDFS写、读数据流程1.1 HDFS写数据流程1.1 剖析文件写入1、客户端通过Distributed FileSystem模块向NameNode请求上传文件，NameNode检查目标文件是否已存在，父目录是否存在。2、NameNode返回是否可以上传。3、客户端请求第一个Block上传到哪几个DataNode服务器上。4、NameNode返回三个DataNode节点，分别为dn1、dn2....

文章 2017-11-14 来自：开发者社区

Hadoop HDFS概念学习系列之DataNode（六）

　　HDFS的管理节点是NameNode，用于存储并管理元数据。那么具体的文件数据存储在哪里呢?DataNode就是负责存储数据的组件，一个数据块Block会在多个DataNode中进行冗余备份;而一个DataNode对于一个块最多只包含一个备份。所以可以简单地认为DataNode上存储了数据块ID和数据块内容，以及它们的映射关系。一个HDFS集群可能包含上千个DataNode节点，这些Data....

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