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prefaceAfter reading the title, will you be surprised how Kunlun distributed database plays a distributed file system?Since version 0.9 of Kunlun distributed database requires the addition of HDFS distributed file backup function, my little brother will share the learning process in his work.HDFS (Hadoop distributed file system) is the core sub ...

FastAPI day 4 1. Multi application management When we develop, a large number of routes are often involved. If all routes are written in one file, it is not conducive to us to modify a route and its processing function, and it is not conducive to the later maintenance and upgrading of the whole project. Moreover, the number of code lines ...

The purpose of current limiting is to protect the system when the system flow is too large to avoid system instability or even failure due to too large flow. There are many current limiting schemes in the cloud native environment. The lightweight scheme can use the memory data combination scheme of Bucket4j + Hazelcast/ignite/infinispan. Senti ...

MySQL -- index creation principle 1. Data preparation Create database and table create database if not exists testindexdb; use testindexdb; create table student_info( id int(11) not null auto_increment, student_id int(11) not null , name varchar(20) default null, course_id int not null , class_id int(11) defaul ...

A string representing a numeric value 1, Title Description Please implement a function to judge whether the string represents a numeric value (including integer and decimal). The values (in order) can be divided into the following parts: Several spaces A decimal or integer ((optional) one 'e' or 'E' ，Followed by an integer Several ...

Introduction Good luck, eat chicken tonight ~ today, I played with my friends to eat chicken and experienced various death methods. I was also ridiculed that there are 100 death methods for girls to eat chicken, such as being swung to death by fist, parachuting to the edge of the roof, playing chicken as a flying car, being killed by car skill ...

Spring Boot is a new development framework under the spring family. Its design purpose is mainly to simplify the creation and development process of spring applications. It provides features such as automatic configuration and starter dependency, so as to free developers from a large number of XML configurations. Spring Boot is committed to bec ...

In RNA SEQ, principal component analysis (PCA) is one of the most common types of multivariate data analysis. This issue mainly introduces how to analyze using the existing expression difference data. Don't worry, see below. 1. Preface 1. Relevant background In RNA SEQ, principal component analysis (PCA) is one of the most common types of mu ...

Virtual DOM node Virtual DOM is a JS abstract representation of DOM. They are JS objects that can describe the structure and relationship of DOM. Various state changes of the application will be reflected on the virtual Dom and finally mapped to the real dom. Before rendering the virtual DOM, we need to make some preparations. By observi ...

K-nearest neighbor algorithm K-nearest neighbor algorithm (KNN) is a basic classification and regression method proposed in 1967. The working principle is: there is a sample data set, also known as the training sample set, and each data in the sample set has a label, that is, we know the corresponding relationship between each data in the samp ...