hadoop读数据流程的相关内容

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....

问答 2022-01-13 来自：开发者社区

Hadoop 读数据的流程是怎样的？

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更新时间 2024-04-16 16:17:59

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开源大数据平台 E-MapReduce（简称“EMR”）是云原生开源大数据平台，向客户提供简单易集成的Hadoop、Hive、Spark、Flink、Presto、ClickHouse、StarRocks、Delta、Hudi等开源大数据计算和存储引擎服务。

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