Programmer Group

2021SC@SDUSC 1, Brief description Coding + compression can double the disk space of data and save considerable storage costs. At the same time, shrinking can usually improve the system throughput, so that the system can do more work In terms of space saving processing at the storage level, HBase provides two schemes: 1. Key based coding. I ...

Edit computer vision lifeZach, a mobile robot practitioner, loves the mobile robot industry and is determined to help a better life with science and technology.The first step in the design idea of logo-beam framework is to extract and separate the ground. This article will explain in detail how logo-beam performs ground extraction.Idea of groun ...

If the original link installation is not successful, you can refer to my version. sketch Kubedm binary deploys k8s cluster. The whole deployment process is relatively cumbersome, but it is helpful for entrants to preliminarily understand k8s components, networks and other information through installation, so they still need to know. What this ...

Series of articles:Container & Service: Helm Charts (I)Container & Service: Helm Charts (II) installation and useContainer & Service: Helm Charts (III) K8s cluster informationI. Introduction chart is Helm's application packaging format. chart consists of a series of files that describe the resources required for K8s to deploy app ...

1. Difference between = = and is ==Operator compares values between objects for equality.The is operator compares whether the identities of objects are equal, that is, whether they are the same object and point to the same memory address. In Python, the identity of each object can be obtained through the function id(object). Therefore, the is ...

Code address of this series: https://github.com/JoJoTec/sp...Why do I need to encapsulate the asynchronous HTTP client WebClientFor synchronous requests, we use FeignClient encapsulated in spring cloud openfeign and make additional customization. For asynchronous requests, the asynchronous Http client, i.e. WebClient, is used. The use of WebCli ...

Evening moon preface Originally, I intended to write the principle of the global event bus in Vue, but I found that I wrote less about the custom event, did not understand the operation of the custom event, and it was difficult to write the principle of the global event, so I had this article. 1, v-on instruction To talk about custom event ...

Foreword: Recently, I have been exploring the debugging and diagnosis direction of Node.js, because the capabilities provided by Node.js may not solve problems sometimes. For example, the heap memory has not changed, but rss has been rising. Therefore, we need to go deeper to understand more troubleshooting methods. These directions often invol ...

Dynamic sql Dynamic SQL is one of the powerful features of MyBatis. Using dynamic SQL, we can flexibly splice SQL statements according to different conditions. Common dynamic SQL tags are as follows: ifchoose(when,otherwise)trim(where,set)foreach if When < if > sql < / if > is used, if the conditions are met, the SQL will ...

Previous bug resolution bug1 Previously, when setting the upload report, a field was missing to store the package id, because a member can reserve multiple packages. Now the problem has been solved Solution: in t_ In the report table (that is, in the database where the file name of the report is stored), a setmealId field is added to store t ...