Articles
android

High-availability cluster (5)-k8s deployment of microservices

k8s stateful service What is a stateful service Stateless service 1. It means that the instance of the service running will not store the data that needs to be persisted locally, and the results of multiple instances for the same request response are exactly the same 2. Multiple instances can share the same persistent data. For example: nginx instance, tomcat instance, etc. 3. Related k8s resources include: ReplicaSet, ReplicationController, Deployment, etc. Because it is a stateless service, th

... Henry
schedule 16 min read
android

node ( )

github awesome-nodejs github awesome-nodejs 41k awesome-nodejs 1.Git 1.1 1: git eslint commit husky - Git pre-commit - git git pre-commit pre-commit npm test yorkie yorkie yorkie fork husky Git ( vue-cli 3x ) 1.2 2: node git download-git-repo - Git ( GitHub, GitLab, Bitbucket) 1.3 3: git gitgraph - Terminal git React 1.4 git-url-parse - git giturl - Git Web 2. 2.1 1: cross-env - dotenv - .env nodejs vue-cli --mode - --mode 3.NPM 3.1 1: npm nrm - npm npm cnpm nj taobao npm pnpm - yarn npm 3.2 2:

... George
schedule 3 min read
android

Beautiful cherry blossom dancing animation

background This matter should start from the big promotion...Every year 411 is the exclusive cherry blossom festival of Princess Pea. Since it is the cherry blossom festival, many activities and elements are around the cherry blossom exhibition. For example, the content to be shared this time needs to be a picture of cherry blossoms dancing. Of course, due to time issues, it may not be so cool. Here is mainly to share some ideas with you, and the specific effects. You can use your own imaginatio

... Benjamin
schedule 12 min read
android

The key-value framework based on attribute delegation encapsulation, it doesn t suit your appetite.

The key-value method of storage is believed to be used in every project, and the use requires packaging. The function is to operate uniformly, facilitate use and can be easily replaced if the framework is changed. KvPref is a framework that uses kotlin attribute delegation to encapsulate. It is similar to many other similar principles. There are also many articles on the Internet, so here is mainly to see if the usage suits your liking. Github: KvPref usage 1. Initialization KvPrefModel.initKvPr

... Ashton
schedule 10 min read
android

Summarize the algorithmic questions of a wave of trees to help you ride the wind and waves in the interview |

This article is participating Nuggets team number on-line activity, click to see giant spring recruit jobs Writing algorithms in the interview is a must. One of the characteristics of algorithmic questions is that if you have done it and have ideas, you will be able to do it soon; if you have not done it, it will be a test of on-the-spot performance. I sometimes get nervous during the interview, and I see algorithmic questions getting frustrated, which ultimately affects the interview results .

... Wesley
schedule 10 min read
coder_life

ANDROID memory optimization (big summary)

OOM: Memory leaks can cause many problems: 1. The program freezes, and the response speed is slow (the JVM virtual machine frequently triggers GC when the memory usage is high) 2. Inexplicably disappears (when your program occupies more memory, it is in the background The more likely it is to be killed. On the contrary, the smaller the memory footprint, the longer it will exist in the background) 3. Direct crash (OutOfMemoryError) Problems faced by ANDROID memory: 1. Limited heap memory, the ori

... Carter
schedule 23 min read
coder_life

spring-boot mybadis multiple data source configuration

Strongly recommended: As long as one line of annotation, use mybatis's multiple data sources without any configuration. github address: gitee.com/xiaojiezhu/... \ Only one line of annotation is needed to configure multiple data sources of mybadis This is a mybadis starter based on spring boot Support multiple data sources The usage is very simple, first define some configuration files and put them in application.yml mysql: server: saas: url: "jdbc:mysql://localhost:3306/saas?useUnicode=true&

... Luis
schedule 13 min read
coder_life

C++ University Course (Seventh Edition) After-Class Exercises Answers Chapter 89

chapter eight 8.12 (Simulation of the tortoise and the hare race) #include <iostream> #include <cstdlib> #include <ctime> #include <iomanip> using namespace std; const int RACE_END = 70 ; void moveTortoise(int* const ); void moveHare(int* const ); void printCurrentPositions( const int* const , const int* const ); int main () { int tortoise = 1 ; int hare = 1 ; int timer = 0 ; srand(time( 0 )); cout << "ON YOUR MARK, GET SET\nBANG !!!!" << "\nAND THEY'RE OFF !!

... Aaron
schedule 49 min read
coder_life

Complexity Analysis (Part 1): How to analyze and count the execution efficiency and resource consumption of algorithms?

Why is complexity analysis needed? You may be a little confused. I ran the code once, and through statistics and monitoring, we can get the time of algorithm execution and the amount of memory occupied. Why do we need to analyze the complexity of time and space? Can this method of analysis be more accurate than the data I actually get from running it again? First of all, I can say with certainty that your method of evaluating algorithm execution efficiency is correct. Many data structure and alg

... Colton
schedule 19 min read
coder_life

Tree traversal and its basic operations

main content: Recursive and iterative realization of binary tree traversal (pre-order, middle-order, post-order, breadth-first traversal) The depth of the binary tree, all paths from the binary tree to the leaf nodes First, define the binary tree class class TreeNode : def __init__ ( self,x ): self.val=x = self.left None self.right = None duplicated code class TreeNode { //Tree int val; TreeNode left; TreeNode right; TreeNode( int x) {val = x;} } Copy code The traversal of the binary tree is div

... Adriana
schedule 9 min read
dev_tools

Java Concurrent Programming Topic One (Challenges and Low-Level Implementation)

The first part, the challenge of concurrent programming The purpose of concurrent programming is to make the program run faster, but it is not that starting more threads will allow the program to execute concurrently to the maximum extent. 1. Context switching The CPU implements this mechanism by assigning CPU time slices to each thread. The time slice is the time allocated by the CPU to each thread. Because the time slice is very short, the CPU keeps switching thread execution, which makes us f

... Aubrey
schedule 28 min read
dev_tools

Five, MySQL lock mechanism

1 Overview A lock is a mechanism for a computer to coordinate multiple processes or threads to concurrently access a certain resource. In the database, in addition to contention for computer hardware resources (CPU, RAM, I/O, etc.), data is also a resource shared by many users. How to ensure the consistency and effectiveness of concurrent access data is a problem that all databases must solve. Lock conflicts are also an important factor that affects the performance of concurrent access to the da

... Melody
schedule 32 min read
dev_tools

Explain in detail the "microservice" architecture system-SpringCloud Alibaba!

01 Foreword The term "microservices" is derived from Martin Fowler's blog named Microservices, which can be found on his official blog http://martinfowler. com/articles/microservices.html. Simply put, microservices are based on the system architecture. A design style whose main purpose is to split an originally independent system into multiple small services. These small services run in separate processes. The services communicate and collaborate through HTTP-based RESTfuL AP. Common microservic

... Paige
schedule 37 min read
dev_tools

Development artifact EasyCode

Preface Introduction to Easy Code For java programmers, the daily work is the operation of crud. Every time you have to build MVC three layers, it is still very cumbersome. Here is the tool of the artifact easycode, which can quickly generate code and customize the template, so For developers, it has reduced a lot of things, spent more time on business, and greatly improved efficiency. Now let's build easycode step by step and use it. 1. Open IntelliJ IDEA and create a new maven project 2. Selec

... Cameron
schedule 11 min read
dev_tools

Column | Feature Engineering Manual Based on Jupyter: Data Preprocessing (1)

Author: Yingxiang Chen & Zihan Yang Editor: Red Stone The importance of feature engineering in machine learning is self-evident, and proper feature engineering can significantly improve the performance of machine learning models. We have compiled a systematic feature engineering tutorial on Github for your reference and study. project address: github.com/YC-Coder-Ch... This article will discuss the data preprocessing part: how to use scikit-learn to process static continuous variables, use C

... Sydney
schedule 26 min read
programming

2w | 28 LeetCode

LeetCode 1 3.5w | 47 LeetCode 2 3.5w | 47 LeetCode 1. 1 Linked List Node Head Node Tail Node 763 0x56432 0x56432 0x0 0 NULL JavaScript val next function ListNode(val) { this.val = val; this.next = null; } next JavaScript 2 1 2 O(1) N N O(N) O(N) O(1) N O(N) 3 1 Singly Linked List 2 Doubly Linked List 3 Circular Linked List 2. Dummy Head N N+1 6 LeetCode 707 6 /code here/ 6 var MyLinkedList = function() { /* code here: */ }; MyLinkedList.prototype.addAtTail = function(val) { /* code here: val */

... Emmett
schedule 32 min read
programming

The sorting principle of Array.prototype.sort

Has been updating recently Typescript Data structure and algorithm series, in learning JS of sort The method generates curiosity,Array.prototype.sort()The usage of is definitely familiar: arr.sort([compareFunction]); copy the code sort The parameter of the method is an optional sort callback function compareFunction, There are two parameters for comparison in the callback function. If omitted, the elements are in accordance with the characters of the converted stringUnicodeThe sites are sorted.

... Justin
schedule 12 min read
programming

Eggjs Sequelize (ORM) MySQL

Eggjs MySQL & Sequelize (ORM) Eggjs MySQL Sequelize sequelize ORM MySQL PostgreSQL SQLite MSSQL npm install --save egg-sequelize mysql2 config/plugin.js sequelize: { enable: true, package: 'egg-sequelize', }, config/config.default.js // sequelize config.sequelize = { dialect: 'mysql', host: '127.0.0.1', port: 3306, database: 'egg-db', username: 'root', // password: '12345678', // timezone: '+08:00', // define: { timestamps: true, // created_at updated_at paranoid: true, // deleted_at undersc

... Melanie
schedule 8 min read
programming

Acwing-Algorithm Basic Course-Notes (9)

Search and Graph Theory (3) This section explains the minimum spanning tree and bipartite graph Minimum spanning tree What is the minimum spanning tree? First, given an undirected connected graph G with n nodes and m edges. Then the undirected connected graph composed of all n nodes and n-1 edges is called a spanning tree of G. Among all spanning trees of G, the spanning tree with the smallest sum of edge weights is It is called the minimum spanning tree of G. There are two common algorithms: Pr

... Isaiah
schedule 22 min read
programming

In the face of large-scale K8s clusters, how to find problems before users?

Author | Peng Nanguang (Guangnan) Source | Alibaba Cloud Native Official Account The embankment of a thousand miles collapsed in an ant's nest. introduction I don t know if you have ever experienced such a scenario: Suddenly being notified by the user that there is a problem with the system, and then looking in a daze to troubleshoot and repair it; or when you find that the system is malfunctioning, it has actually caused a serious adverse effect on the user. The so-called dike of a thousand mi

... Natalie
schedule 18 min read
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