hadoop namenode工作机制的相关内容

Hadoop中NameNode和SecondaryNameNode、NN和2NN工作机制、Fsimage和Edits解析、oiv查看Fsimage、oev查看Edits、CheckPoint时间设置

@[toc]9.NameNode和SecondaryNameNode9.1NN和2NN工作机制思考：NameNode中的元数据是存储在哪里的？首先，我们做个假设，如果存储在NameNode节点的磁盘中，因为经常需要进行随机访问，还有响应客户请求，必然是效率过低。因此，元数据需要存放在内存中。但如...

Hadoop-HDFS的NameNode工作机制

NameNode工作机制1、NameNode启动，加载编辑日志和镜像文件；（每个Block元数据约150B），获取最新元数据。2、HDFS客户端进行增删改操作3、NameNode记录编辑日志，之后修改内存中的元数据。4、SecondaryNameNode请求NameNode是否需要CheckPoin...

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Hadoop的namenode的管理机制，工作机制和datanode的工作原理

HDFS前言：　　1）设计思想　　　　分而治之：将大文件、大批量文件，分布式存放在大量服务器上，以便于采取分而治之的方式对海量数据进行运算分析；　　2）在大数据系统中作用：　　　　为各类分布式运算框架（如：mapreduce，spark，tez，……）提供数据存储服务　　3）重点概念：文...

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