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The article is too long, and the contents are as follows: Docker architecture Here, we first have a general understanding of docker from a macro perspective. On the whole, it is a C/S architecture; The "docker" command we usually use is its CLI client, and its server is "dockerd". In Linux system, we usually use "sy ...

There are two main ways to migrate data between HDFS and relational databases: The file is generated according to the file format required by the database, and then imported by the import tool provided by the databaseImport using JDBC MapReduce provides DBInputFormat and DBOutputFormat by default, which are used for database reading and datab ...

Detailed explanation of vue slot Recently, I was asked if I knew about vue slots. When I thought about it, I found that this thing seems to be rarely used. So I sorted out some usage of slot. slot (the parent component inserts content at the child component) vue implements a set of API s for content distribution, and takes elements as the ex ...

Sword finger offer brush questions 03 [duplicate number in array] class Solution { public: int findRepeatNumber(vector<int>& nums) { sort(nums.begin(),nums.end()); for(int i=0;i<nums.size();i++) { if(nums[i+1]==nums[i]) { //cout<<nums[i]<<endl; ...

Structure 15 dynamic binding of messages Message polymorphism Message polymorphism is reflected in that the same message can be sent to different types of objects, so it will get different interpretations. For two classes with public inheritance relationship, one message can be sent to the base class object or to the derived class object. If ...

Introduce JS You can get Apache EChartsTM in the following ways. From Download Interface of Apache ECharts official website Get the official source code package and build it. At ECharts GitHub Get. For details, see install nphart, save npecm“ Using ecarts in webpack" Pass jsDelivr Wait for CDN introduction Directly import the const ...

Narration: This paper mainly describes how to integrate and realize multi attachment e-mail sending in Springboot, and takes the QQ mailbox server as the e-mail server to send e-mail; 1. Preliminary preparation What is the main need? First, you should know the sending mail server provided by the server where the email account you choos ...

Article structure: Gunicorn preliminaryinstall and usagepros & cons supervisor install and usage Gunicorn Gunicorn 'Green Unicorn' (pronunciation jee-unicorn | green unicorn | gun-i-corn) is a widely used Python WSGI UNIX HTTP server, transplanted from Ruby's Unicorn project, using a pre-fork working mode, which is simple to use, ...

Sequential control Branch control Cycle control Sequential control Step by step from top to bottom Branch control Branch control is to give Cheng Xi a choice to execute Single branch Double branch Multi branch Single branch control //if conditional expression{ //} func main() { var age int fmt.Println("Please enter age") fmt.Scanln ...

Session and Cookie cookie The information saved on the client browser by the server can teach cookie s The expression form is generally k:v key value pairs (can be multiple)   Optimization: Random string 1: user 1 related information Random string 2: User 2 related information   session The data is saved on the server The expression ...