Use and installation of sqoop

SQOOP installation and use SQOOP installation 1. Upload and unzip Installation package download address http://archive.apache.org/dist/sqoop/1.4.7/ tar -zxvf sqoop-1.4.7.bin__hadoop-2.6.0.tar.gz -C /usr/local/soft/ 2. Modify folder name mv sqoop-1.4.7.bin__hadoop-2.6.0/ sqoop-1.4.7 3. Modify profile # Switch to the sqoop profile ...

Posted on Mon, 06 Dec 2021 17:35:45 -0500 by CoreyR

Handwritten RPC core module network protocol module writing -- implementation of codec

The previous foundation has been written. Now let's implement the encoder. Why do I need an encoder? netty is only responsible for transmitting data. It doesn't care what the data looks like. As mentioned earlier, the custom protocol is to organize, transmit and decode the data we want to transmit according to our rules. The encoder is to organ ...

Posted on Mon, 06 Dec 2021 17:33:32 -0500 by AncientSage

The adaptation process of the previous life and the present life of the Flutter launch page

The APP startup page is the most common and necessary scenario in China. The startup page is a mandatory requirement on iOS. In fact, configuring the startup page is very simple, because in fluent, you only need:Configure LaunchScreen.storyboard for iOS;Configure windows background for Android;Generally, as long as the configuration is correct ...

Posted on Mon, 06 Dec 2021 17:26:55 -0500 by gchouchou

Basic image filter of computer vision

1. Image noise definition Image noise is a signal that interferes with random signals in the process of image acquisition or transmission, which hinders people's understanding, analysis and processing of images. produce The generation of image noise comes from the environmental conditions in image acquisition and the quality of sensing ...

Posted on Mon, 06 Dec 2021 17:25:42 -0500 by Trizen

React component Foundation

catalogue What is a component? There are two ways to create components 2. Class components Extract component Status of components Instance property method There are several methods to solve the problem of event binding this point   Controlled and uncontrolled of forms What is a component? Component is a part of the page. Us ...

Posted on Mon, 06 Dec 2021 17:14:39 -0500 by ryy705

Thymeleaf foundation and springboot integration

1, Meet Thymeleaf Students who have worked on the SSM web project know that when we want to interact with the back-end data on the HTML page, we have no choice but Ajax, and the use of JSTL on the HTML page is not supported. At this time, we need to use the JSP page - a special java class (servlet in essence). However, the compatibility betwee ...

Posted on Mon, 06 Dec 2021 17:03:56 -0500 by Prine

Java Concurrent learning: source code analysis of non blocking concurrent queue based on CAS

Today, let's talk about concurrent linkedqueue The ConcurrentLinkedQueue we are going to learn today does not implement the BlockingQueue interface. It is a thread safe and unbounded non blocking queue that completely uses CAS operations. Structural composition public class ConcurrentLinkedQueue<E> extends AbstractQueue<E> ...

Posted on Mon, 06 Dec 2021 16:48:18 -0500 by Stelios

Java image to character output example demo

Java image to character output example demoThe previous blog posts introduced the use of jdk to do some interesting conversion of pictures. Next, we will introduce an interesting way to output a two-dimensional character array directly according to the pictures to realize the scene of painting with characters<!-- more -->You may have seen ...

Posted on Mon, 06 Dec 2021 16:45:55 -0500 by php-n00b

JDBC (Java database connection)

JDBC (Java database connectivity) Is a Java API for executing SQL statements, which can provide unified access to a variety of relational databases. It is composed of a group of classes and interfaces written in Java language. JDBC provides a benchmark, according to which more advanced tools and interfaces can be built, so that database develo ...

Posted on Mon, 06 Dec 2021 16:44:34 -0500 by mnewhart

Install MySQL on alicloud server

1. Download MySQL installation package Using Huawei image download, the download speed will be faster. The following is the link of Huawei image: https://mirrors.huaweicloud.com/mysql/Downloads/MySQL-8.0/ The version I selected is 8.0.27, which can be downloaded   mysql-8.0.27-linux-glibc2.12-x86_64.tar.xz   file     2. Upload the in ...

Posted on Mon, 06 Dec 2021 16:30:18 -0500 by MP145