1. ?NameNode overview
a. NameNode is the core of HDFS.
b, NameNode is also called Master.
c. NameNode only stores HDFS metadata: the directory tree of all files in the file system
Tag: basic principle
First, MapReduce basic principle
1. Basic Overview of MapReduce 1. Definition It is a programming framework for distributed computing programs. The core function is to integrate the business logic code written by the user and the
Basic principle of browser rendering
The refresh rate of most devices is 60Hz, which means that the browser’s rendering of each frame of the screen must be completed within 16ms. Beyond this time, the rendering of the page will be stu